components/ButtonBar/examples/ButtonBarIconExample.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 <UIKit/UIKit.h>

#import "MaterialButtonBar.h"
#import "MaterialIcons+ic_check_circle.h"
#import "MaterialIcons+ic_info.h"

@interface ButtonBarIconExample : UIViewController
@end

@implementation ButtonBarIconExample

- (void)viewDidLoad {
  [super viewDidLoad];

  MDCButtonBar *buttonBar = [[MDCButtonBar alloc] init];
  buttonBar.tintColor = UIColor.whiteColor;

  // MDCButtonBar ignores the style of UIBarButtonItem.
  UIBarButtonItemStyle ignored = UIBarButtonItemStyleDone;

  UIBarButtonItem *actionItem = [[UIBarButtonItem alloc]
      initWithImage:[[MDCIcons imageFor_ic_info]
                        imageWithRenderingMode:UIImageRenderingModeAlwaysTemplate]
              style:ignored
             target:self
             action:@selector(didTapActionButton:)];
  UIBarButtonItem *secondActionItem = [[UIBarButtonItem alloc]
      initWithImage:[[MDCIcons imageFor_ic_check_circle]
                        imageWithRenderingMode:UIImageRenderingModeAlwaysTemplate]
              style:ignored
             target:self
             action:@selector(didTapActionButton:)];

  NSArray *items = @[ actionItem, secondActionItem ];

  // Set the title text attributes before assigning to buttonBar.items
  // because of https://github.com/material-components/material-components-ios/issues/277
  for (UIBarButtonItem *item in items) {
    [item setTitleTextAttributes:@{NSForegroundColorAttributeName : [UIColor whiteColor]}
                        forState:UIControlStateNormal];
  }

  buttonBar.items = items;

  // MDCButtonBar's sizeThatFits gives a "best-fit" size of the provided items.
  CGSize size = [buttonBar sizeThatFits:self.view.bounds.size];
  CGFloat x = (self.view.bounds.size.width - size.width) / 2;
  CGFloat y = self.view.bounds.size.height / 2 - size.height;
  buttonBar.frame = CGRectMake(x, y, size.width, size.height);
  buttonBar.autoresizingMask =
      (UIViewAutoresizingFlexibleTopMargin | UIViewAutoresizingFlexibleBottomMargin |
       UIViewAutoresizingFlexibleLeftMargin | UIViewAutoresizingFlexibleRightMargin);
  [self.view addSubview:buttonBar];

  // Ensure that the controller's view isn't transparent.
  self.view.backgroundColor = [UIColor colorWithWhite:0.9 alpha:1.0];
}

#pragma mark - User actions

- (void)didTapActionButton:(id)sender {
  NSLog(@"Did tap action item: %@", sender);
}

@end

@implementation ButtonBarIconExample (CatalogByConvention)

+ (NSArray *)catalogBreadcrumbs {
  return @[ @"Button Bar", @"Button Bar (Icons)" ];
}

+ (BOOL)catalogIsPrimaryDemo {
  return NO;
}

@end

#pragma mark - Typical application code (not Material-specific)

@implementation ButtonBarIconExample (GeneralApplicationLogic)

- (id)init {
  self = [super init];
  if (self) {
    self.title = @"Button Bar Icons";
  }
  return self;
}

@end