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This PR replaces API links containing "/api-docs/" with links to suitable header files in GitHub because the site previously linked to is being taken down and replaced with something that won't handle API docs. Closes https://github.com/material-components/material-components-ios/pull/10045 COPYBARA_INTEGRATE_REVIEW=https://github.com/material-components/material-components-ios/pull/10045 from andrewoverton:replace-mio-api-docs-with-github-links 0d6e56cc11d0c147366a4f6cde829d8b51567ecc PiperOrigin-RevId: 323424362
395 lines
15 KiB
Markdown
395 lines
15 KiB
Markdown
<!--docs:
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title: Buttons
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layout: detail
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section: components
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excerpt: "iOS Buttons"
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iconId:
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path: /catalog/buttons/
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api_doc_root: true
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-->
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# Buttons
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[Buttons](https://material.io/components/buttons/) allow users to take actions, and make choices, with a single tap.
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There are four types of buttons:
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1. [Text button](#text-button)
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2. [Outlined button](#outlined-button)
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3. [Contained button](#contained-button)
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4. [Toggle button](#toggle-button) (*not supported in iOS*)
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## Using buttons
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All Material buttons are implemented by `MDCButton`, a subclass of [UIButton](https://developer.apple.com/documentation/uikit/uibutton).
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* [GitHub source](https://github.com/material-components/material-components-ios/blob/develop/components/Buttons/src/MDCButton.h)
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### Install `MDCButton`
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`MDCButton` is used to implement all four Material Buttons. In order to use `MCDButton`, first add Buttons to your `Podfile`:
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```bash
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pod MaterialComponents/Buttons
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```
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<!--{: .code-renderer.code-renderer--install }-->
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Then, run the installer.
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```bash
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pod install
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```
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After that, import the Buttons and initialize them using `alloc`/`init`.
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<!--<div class="material-code-render" markdown="1">-->
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#### Swift
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```swift
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import MaterialComponents.MaterialButtons
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import MaterialComponents.MaterialButtons_Theming
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let button = MDCButton()
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```
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#### Objective-C
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```objc
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#import "MaterialButtons.h"
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#import <MaterialComponents/MaterialButtons+Theming.h>
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MDCButton *button = [[MDCButton alloc] init];
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```
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<!--</div>-->
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### Making Buttons accessible
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To help ensure your buttons are accessible to as many users as possible, please
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be sure to review the following recommendations:
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#### Set `-accessibilityLabel`
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Set an appropriate
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[`accessibilityLabel`](https://developer.apple.com/documentation/uikit/uiaccessibilityelement/1619577-accessibilitylabel)
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value if your button does not have a title. This is often the case with Floating
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Action Button instances which typically only have an icon.
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<!--<div class="material-code-render" markdown="1">-->
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#### Swift
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```swift
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button.accessibilityLabel = "Create"
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```
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#### Objective-C
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```objc
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button.accessibilityLabel = @"Create";
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```
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<!--</div>-->
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#### Minimum touch size
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Make sure that your buttons have a minimum touch area. The Material spec
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for buttons calls for buttons that have a [visual height of
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36](https://material.io/design/components/buttons.html#specs)
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and that [touch areas should be at least 48 points high and 48
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wide](https://material.io/design/layout/spacing-methods.html#touch-click-targets).
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#### Set the touch size
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To keep a button's visual sizes small with larger touchable areas, set the
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`hitAreaInsets` to a negative value. Be careful to maintain sufficient distance
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between the button touch targets. This will allow your button to have [a large
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enough touch
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target](https://material.io/design/layout/spacing-methods.html#touch-click-targets)
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while maintaining the desired visual appearance. For more see the [Touch and click
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targets](https://material.io/design/layout/spacing-methods.html#touch-click-targets)
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in the spec.
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<!--<div class="material-code-render" markdown="1">-->
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#### Swift
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```swift
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let buttonVerticalInset =
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min(0, -(kMinimumAccessibleButtonSize.height - button.bounds.height) / 2);
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let buttonHorizontalInset =
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min(0, -(kMinimumAccessibleButtonSize.width - button.bounds.width) / 2);
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button.hitAreaInsets =
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UIEdgeInsetsMake(buttonVerticalInset, buttonHorizontalInset,
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buttonVerticalInset, buttonHorizontalInset);
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```
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#### Objective-C
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```objc
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CGFloat verticalInset = MIN(0, -(48 - CGRectGetHeight(button.bounds)) / 2);
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CGFloat horizontalInset = MIN(0, -(48 - CGRectGetWidth(button.bounds)) / 2);
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button.hitAreaInsets = UIEdgeInsetsMake(verticalInset, horizontalInset, verticalInset, horizontalInset);
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```
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<!--</div>-->
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#### Set the minimum visual size of the button
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Set your buttons to have a minimum size. [Material Buttons
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guidelines](https://material.io/design/components/buttons.html#specs)
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typically recommend [a minimum height of 36 points and a minimum width of 64
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points](https://material.io/design/components/buttons.html#specs).
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<!--<div class="material-code-render" markdown="1">-->
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#### Swift
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```swift
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button.minimumSize = CGSize(width: 64, height: 48)
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```
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#### Objective-C
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```objc
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button.minimumSize = CGSizeMake(64, 36);
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```
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<!--</div>-->
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#### Exceptions
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However there are
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[some](https://material.io/design/components/buttons.html#toggle-button) clear
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[exceptions](https://material.io/design/components/app-bars-bottom.html#specs)
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for these rules. Please adjust your buttons sizes accordingly.
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#### Using `accessibilityHint`
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Apple rarely recommends using the `accessibilityHint` because the label should
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already be clear enough to indicate what will happen. Before you consider
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setting an `-accessibilityHint` consider if you need it or if the rest of your
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UI could be adjusted to make it more contextually clear.
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A well-crafted, thoughtful user interface can remove the need for
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`accessibilityHint` in most situations. Examples for a selection dialog to
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choose one or more days of the week for a repeating calendar event:
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- (Good) The dialog includes a header above the list of days reading, "Event
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repeats weekly on the following day(s)." The list items do not need
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`accessibilityHint` values.
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- (Bad) The dialog has no header above the list of days. Each list item
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(representing a day of the week) has the `accessibilityHint` value, "Toggles
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this day."
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## Text button
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<img src="assets/ios-text-button.gif" alt="An animated Material Design text button." width="128">
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[Text buttons](https://material.io/components/buttons/#text-button) are typically used for less-pronounced actions, including those located in dialogs and cards. In cards, text buttons help maintain an emphasis on card content.
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### Text button example
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To use a text button use the text button theming method on the MDCButton theming extension. For more information on theming extensions see the [Theming section](#theming-buttons).
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<!--<div class="material-code-render" markdown="1">-->
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#### Objective-C
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```objc
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[self.button applyTextThemeWithScheme:self.containerScheme];
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```
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#### Swift
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```swift
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button.applyTextTheme(withScheme: containerScheme)
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```
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<!--</div>-->
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### Anatomy and key properties
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A text button has a text label, a transparent container and an optional icon.
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1. Text label
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1. Container
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1. Icon
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#### Text label attributes
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| Attribute | Related method(s) | Default value
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-------------- | ------------------------ | --------------------------------- | -------------
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**Text label** | `titleLabel` | `setTitle:forState:`<br/>`titleForState:` | `nil`
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**Color** | `titleLabel.textColor` | `setTitleColor:forState:`<br/>`titleColorForState:` | Primary color
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**Typography** | `titleLabel.font` | `setFont:` and `font` on `titleLabel` | Button
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#### Container attributes
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| Attribute | Related method(s) | Default value
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---------------- | --------------------- | ---------------------------------------------------------------------------- | -------------
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**Color** | `backgroundColor` | `setBackgroundColor:forState:`<br/>`backgroundColorForState`<br/> | `UIColor.clearColor`
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**Stroke color** | | `setBorderColor:forState:`<br/>`borderColorForState:` | `nil`
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**Stroke width** | | `setBorderWidth:forState:`<br/>`borderWidthForState:` | `0`
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**Ripple color** | `inkColor` | `setInkColor`<br/>`inkColor` | Primary color at 12% opacity
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#### Icon attributes
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| Attribute | Related method(s) | Default value
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----------------------------------------------- | ----------------- | --------------------------------------------------------- | -------------
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**Icon** | `imageView` | `setImage:forState:`<br/>`imageForState:` | `nil`
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**Color** | `imageView.tintColor` | `setImageViewTintColor:forState:`<br/>`imageViewTintColorForState:` | `nil`
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## Outlined button
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<img src="assets/ios-outlined.gif" alt="An animated Material Design outlined button." width="115">
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[Outlined buttons](https://material.io/components/buttons/#outlined-button) are medium-emphasis buttons. They contain actions that are important, but aren’t the primary action in an app.
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### Outlined button example
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To achieve an outlined button use the outlined button theming method on the MDCButton theming extension. To access the theming extension see the [Theming section](#theming-buttons).
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<!--<div class="material-code-render" markdown="1">-->
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#### Objective-C
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```objc
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[self.button applyOutlinedThemeWithScheme:self.containerScheme];
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```
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#### Swift
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```swift
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button.applyOutlinedTheme(withScheme: containerScheme)
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```
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<!--</div>-->
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### Anatomy and Key properties
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An outlined button has a text label, a container, and an optional icon.
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1. Text label
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1. Container
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1. Icon
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#### Text label attributes
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| Attribute | Related method(s) | Default value
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-------------- | ------------------------ | --------------------------------- | -------------
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**Text label** | `titleLabel` | `setTitle:forState:`<br/>`titleForState:` | `nil`
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**Color** | `titleLabel.textColor` | `setTitleColor:forState:`<br/>`titleColorForState:` | Primary color
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**Typography** | `titleLabel.font` | `setFont:` and `font` on `titleLabel` | Button
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#### Container attributes
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| Attribute | Related method(s) | Default value
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---------------- | --------------------- | ---------------------------------------------------------------------------- | -------------
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**Color** | `backgroundColor` | `setBackgroundColor:forState:`<br/>`backgroundColorForState`<br/> | `UIColor.clearColor`
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**Stroke color** | | `setBorderColor:forState:`<br/>`borderColorForState:` | On surface color at 12% opacity
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**Stroke width** | | `setBorderWidth:forState:`<br/>`borderWidthForState:` | 1
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**Ripple color** | `inkColor` | `setInkColor`<br/>`inkColor` | Primary color at 12% opacity
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#### Icon attributes
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| Attribute | Related method(s) | Default value
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----------------------------------------------- | ----------------- | --------------------------------------------------------- | -------------
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**Icon** | `imageView` | `setImage:forState:`<br/>`imageForState:` | `nil`
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**Color** | `imageView.tintColor` | `setImageViewTintColor:forState:`<br/>`imageViewTintColorForState:` | `nil`
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## Contained button
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<img src="assets/ios-contained.gif" alt="An animated Material Design contained button." width="128">
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[Contained buttons](https://material.io/components/buttons/#contained-button) are high-emphasis, distinguished by their use of elevation and fill. They contain actions that are primary to your app.
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### Contained button example
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Contained buttons are implemented by [MDCButton](https://github.com/material-components/material-components-ios/blob/stable/components/Buttons/src/MDCButton.h). To achieve a contained button use the contained button theming method on the MDCButton theming extension. To access the theming extension see the [Theming section](#theming).
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<!--<div class="material-code-render" markdown="1">-->
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#### Objective-C
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```objc
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[self.button applyContainedThemeWithScheme:self.containerScheme];
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```
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#### Swift
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```swift
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button.applyContainedTheme(withScheme: containerScheme)
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```
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<!--</div>-->
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### Anatomy and Key properties
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A contained button has a text label, a container, and an optional icon.
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1. Text label
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1. Container
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1. Icon
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#### Text label attributes
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| Attribute | Related method(s) | Default value
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-------------- | ------------------------ | --------------------------------- | -------------
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**Text label** | `titleLabel` | `setTitle:forState:`<br/>`titleForState:` | `nil`
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**Color** | `titleLabel.textColor` | `setTitleColor:forState:`<br/>`titleColorForState:` | On primary color
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**Typography** | `titleLabel.font` | `setFont:` and `font` on `titleLabel` | Button
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#### Container attributes
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| Attribute | Related method(s) | Default value
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---------------- | --------------------- | ---------------------------------------------------------------------------- | -------------
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**Color** | `backgroundColor` | `setBackgroundColor:forState:`<br/>`backgroundColorForState`<br/> | Primary color
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**Stroke color** | | `setBorderColor:forState:`<br/>`borderColorForState:` | `nil`
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**Stroke width** | | `setBorderWidth:forState:`<br/>`borderWidthForState:` | `nil`
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**Ripple color** | `inkColor` | `setInkColor`<br/>`inkColor` | On primary color at 12% opacity
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#### Icon attributes
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| Attribute | Related method(s) | Default value
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----------------------------------------------- | ----------------- | --------------------------------------------------------- | -------------
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**Icon** | `imageView` | `setImage:forState:`<br/>`imageForState:` | `nil`
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**Color** | `imageView.tintColor` | `setImageViewTintColor:forState:`<br/>`imageViewTintColorForState:` | `nil`
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## Toggle button
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[Toggle buttons](https://material.io/components/buttons/#toggle-button) can be used to select from a group of choices. They are not supported on iOS.
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## Theming buttons
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You can theme an MDCButton to match any of the Material Button styles using theming
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extensions. [Learn more about theming extensions](../../../docs/theming.md). Below is a screenshot of Material Buttons with the Material Design Shrine theme:
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### Buttons theming example
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To make use of the theming methods shown in the examples above install the Buttons theming extensions with Cocoapods. First, add the following line to your `Podfile`.
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```bash
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pod MaterialComponents/Buttons+Theming
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```
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<!--{: .code-renderer.code-renderer--install }-->
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Then Run the installer.
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```bash
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pod install
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```
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Next, import the Buttons theming target and initialize a button.
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<!--<div class="material-code-render" markdown="1">-->
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#### Swift
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```swift
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import MaterialComponents.MaterialButtons
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import MaterialComponents.MaterialButtons_Theming
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let button = MDCButton()
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```
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#### Objective-C
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```objc
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#import "MaterialButtons.h"
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#import "MaterialButtons+Theming.h"
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MDCButton *button = [[MDCButton alloc] init];
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```
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<!--</div>-->
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From there, use the theming methods from the examples to achieve your preferred button style.
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