Context:
Due to changes in the Swift runtime over the past years, methods that are considered "optional" in Objective-C need to have @objc annotations in order for Objective-C to be able to perform `respondsToSelector:` invocations.
Problem:
Many of our examples had not annotated their `catalogShouldHideNavigation` methods with the `@objc` annotation, causing the Catalog to wrap the examples in a container app bar view controller. The reason most of these examples would implement `catalogShouldHideNavigation` is because they are managing their own navigation (e.g. to demonstrate AppBar functionality), so this would often result in duplicate AppBars appearing in the example.
The fix:
All `catalogShouldHideNavigation` Swift methods have been annotated with `@objc`.
Fixes https://github.com/material-components/material-components-ios/issues/7576
Fixes https://github.com/material-components/material-components-ios/issues/7578
We need to add @objc annotations to colorScheme and typographyScheme instances in our Swift examples, because we moved to Swift 4.2, the respondsToSelector won't find `setColorScheme:` and `setTypographyScheme:` setters otherwise.
This is a follow up PR for #7166 adds @objc annotations to Swift catalogMetadata() methods, because the Swift 4 compiler no longer attempts to infer what methods should be visible to Objective-C. As a result of this change in the compiler, no Swift examples were showing up in Dragons after #7166. See this article: https://useyourloaf.com/blog/objc-warnings-upgrading-to-swift-4/ for additional context.
[BottomAppBar] Fix it/bottom app bar cut out (#5958)
### Context
FABs can be circular or pill-shaped. As described in #5414, the cutout on BottomAppBar does not take into account pill-shaped FABs.
### The Problem
The UIBezierPath used in the current implementation draws a half circle where the FAB appears. For pill-shaped FABS, this doesn't work, as the cutout needs to made up of two quarter circle and a line connecting them.
### The Fix
I implemented a UIBezierPath that is made up of two quarter circles connected by a line, as well as the remainder of the rectangle that makes up the BottomAppBar's background. By doing so, I was able to provide **one** bezier path for both circular and pill-shaped cutouts, and **one** bezier path for a non-cutout version of the rectangle. This results in a smooth animation between the cutout and non-cutout state.
See https://stackoverflow.com/a/9522806 for an explanation of why the cutout and non-cutout bezier paths need to have the same general structure (e.g. number of path elements, and element types).
### Context
FABs can be circular or pill-shaped. As described in #5414, the cutout on BottomAppBar does not take into account pill-shaped FABs.
### The Problem
The UIBezierPath used in the current implementation draws a half circle where the FAB appears. For pill-shaped FABS, this doesn't work, as the cutout needs to made up of two quarter circle and a line connecting them.
### The Fix
I implemented a UIBezierPath that is made up of two quarter circles connected by a line, as well as the remainder of the rectangle that makes up the BottomAppBar's background. By doing so, I was able to provide **one** bezier path for both circular and pill-shaped cutouts, and **one** bezier path for a non-cutout version of the rectangle. This results in a smooth animation between the cutout and non-cutout state.
See https://stackoverflow.com/a/9522806 for an explanation of why the cutout and non-cutout bezier paths need to have the same general structure (e.g. number of path elements, and element types).
[MDC Swift] Add guards for Swift 4.2+
On Xcode 10, using Tulsi, the unit test target cannot be built because much of the Swift code does
not have the correct syntax for Swift 4.2+. Adding pragmas to allow continued support for Xcode
9.4.2 and Xcode 10.
PiperOrigin-RevId: 220399935
Removes the need to copy-paste stanzas from other files anymore as we'll rely on #4478 to generate the correct stanza for us instead.
This was an automated change generated by running a find-and-replace regular expression:
```
/\*
Copyright ([0-9]+)-present the Material Components for iOS authors\. All Rights Reserved\.
Licensed under the Apache License, Version 2\.0 \(the "License"\);
you may not use this file except in compliance with the License\.
You may obtain a copy of the License at
http://www\.apache\.org/licenses/LICENSE-2\.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied\.
See the License for the specific language governing permissions and
limitations under the License\.
\*/
```
```
/\*
Copyright ([0-9]+)-present the Material Components for iOS authors\. All Rights Reserved\.
Licensed under the Apache License, Version 2\.0 \(the "License"\);
you may not use this file except in compliance with the License\.
You may obtain a copy of the License at
http://www\.apache\.org/licenses/LICENSE-2\.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied\.
See the License for the specific language governing permissions and
limitations under the License\.
\*/
```
```
/\*
Copyright ([0-9]+)-present the Material Components for iOS authors\. All Rights Reserved\.
Licensed under the Apache License, Version 2\.0 \(the "License"\);
you may not use this file except in compliance with the License\.
You may obtain a copy of the License at
http://www\.apache\.org/licenses/LICENSE-2\.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied\.
See the License for the specific language governing permissions and
limitations under the License\.
\*/
```
```
// Copyright $1-present the Material Components for iOS authors. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
```
* Add readme and swift example
* Use autoresize mask for layout
* Use autoresize mask for layout
* Add links in .md file. Apply swift code style.
* Update color example code
