material-components_material-components-ios/components/BottomAppBar/examples/supplemental/BottomAppBarTypicalUseViewController.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 "BottomAppBarTypicalUseViewController.h"

#import "MaterialBottomAppBar.h"

@interface BottomAppBarTypicalUseViewController ()

@end

@implementation BottomAppBarTypicalUseViewController

- (void)commonMDCBottomAppBarViewControllerSetup {
  _bottomBarView = [[MDCBottomAppBarView alloc] initWithFrame:CGRectZero];
  _bottomBarView.autoresizingMask =
      (UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleTopMargin);
  [self.view addSubview:_bottomBarView];
}

- (void)layoutBottomAppBar {
  CGSize size = [_bottomBarView sizeThatFits:self.view.bounds.size];
  CGRect bottomBarViewFrame =
      CGRectMake(0, CGRectGetHeight(self.view.bounds) - size.height, size.width, size.height);
  _bottomBarView.frame = bottomBarViewFrame;
}

- (void)viewDidLoad {
  [super viewDidLoad];
  [self commonMDCBottomAppBarViewControllerSetup];
}

- (void)viewWillLayoutSubviews {
  [super viewWillLayoutSubviews];
  [self layoutBottomAppBar];
}

- (void)viewSafeAreaInsetsDidChange {
  [super viewSafeAreaInsetsDidChange];
  [self layoutBottomAppBar];
}

#pragma mark - Setters

- (void)setViewController:(UIViewController *)viewController {
  if (viewController == _viewController) {
    return;
  }

  // If there is an existing content view controller, remove it.
  if (_viewController) {
    [_viewController willMoveToParentViewController:nil];
    [_viewController.view removeFromSuperview];
    [_viewController removeFromParentViewController];
  }
  _viewController = viewController;

  CGFloat width = CGRectGetWidth(self.view.bounds);
  CGFloat height = CGRectGetHeight(self.view.bounds);

  // Add the underlying content view controller to display beneath the bottom app bar.
  [self addChildViewController:_viewController];
  _viewController.view.frame = CGRectMake(0, 0, width, height);
  [self.view insertSubview:_viewController.view atIndex:0];
  [self didMoveToParentViewController:_viewController];
}

@end