material-components_material-components-ios/components/Chips/examples/ChipsInputExampleViewController.m

// Copyright 2017-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.

#import "ChipsExamplesSupplemental.h"

#import "MaterialChips.h"
#import "MaterialTextFields.h"
#import "MaterialChips+ChipThemer.h"

@interface ChipsInputExampleViewController () <MDCChipFieldDelegate>
@end

@implementation ChipsInputExampleViewController {
  MDCChipField *_chipField;
}

- (id)init {
  self = [super init];
  if (self) {
    _colorScheme = [[MDCSemanticColorScheme alloc] init];
    _typographyScheme = [[MDCTypographyScheme alloc] init];
    _shapeScheme = [[MDCShapeScheme alloc] init];
  }
  return self;
}

- (void)viewDidLoad {
  [super viewDidLoad];

  self.view.backgroundColor = self.colorScheme.backgroundColor;

  _chipField = [[MDCChipField alloc] initWithFrame:CGRectZero];
  _chipField.delegate = self;
  _chipField.textField.placeholderLabel.text = @"This is a chip field.";
  _chipField.backgroundColor = self.colorScheme.surfaceColor;
  [self.view addSubview:_chipField];
}

- (void)viewWillLayoutSubviews {
  [super viewWillLayoutSubviews];

  CGRect frame = CGRectInset(self.view.bounds, 10, 10);
  if (@available(iOS 11.0, *)) {
    frame = UIEdgeInsetsInsetRect(frame, self.view.safeAreaInsets);
  }
  frame.size = [_chipField sizeThatFits:frame.size];
  _chipField.frame = frame;
}

- (void)chipFieldHeightDidChange:(MDCChipField *)chipField {
  [self.view layoutIfNeeded];
}

- (void)chipField:(MDCChipField *)chipField didAddChip:(MDCChipView *)chip {
  MDCChipViewScheme *scheme = [[MDCChipViewScheme alloc] init];
  scheme.colorScheme = self.colorScheme;
  scheme.typographyScheme = self.typographyScheme;
  scheme.shapeScheme = self.shapeScheme;

  // Every other chip is stroked
  if (chipField.chips.count%2) {
    [MDCChipViewThemer applyOutlinedVariantWithScheme:scheme toChipView:chip];
  } else {
    [MDCChipViewThemer applyScheme:scheme toChipView:chip];
  }
  [chip sizeToFit];
  CGFloat chipVerticalInset = MIN(0, (CGRectGetHeight(chip.bounds) - 48) / 2);
  chip.hitAreaInsets = UIEdgeInsetsMake(chipVerticalInset, 0, chipVerticalInset, 0);
}

@end