components/NavigationBar/examples/NavigationBarTypicalUseExample.m

/*
 Copyright 2016-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 "MaterialNavigationBar.h"

#import "NavigationBarTypicalUseExampleSupplemental.h"

@interface NavigationBarTypicalUseExample ()

@end

@implementation NavigationBarTypicalUseExample

- (void)viewDidLoad {
  [super viewDidLoad];
  self.view.backgroundColor = [UIColor whiteColor];

  self.title = @"Navigation Bar";

  self.navBar = [[MDCNavigationBar alloc] initWithFrame:CGRectZero];
  self.navBar.titleTextAttributes = @{NSForegroundColorAttributeName : [UIColor whiteColor]};
  [self.navBar observeNavigationItem:self.navigationItem];
  [self.navBar setBackgroundColor:[UIColor colorWithWhite:0.1 alpha:1.0]];
  MDCNavigationBarTextColorAccessibilityMutator *mutator =
      [[MDCNavigationBarTextColorAccessibilityMutator alloc] init];
  [mutator mutate:self.navBar];

  [self.view addSubview:self.navBar];

  self.navBar.translatesAutoresizingMaskIntoConstraints = NO;

  NSDictionary *viewBindings = @{ @"navBar" : self.navBar };
  NSMutableArray<__kindof NSLayoutConstraint *> *arrayOfConstraints = [NSMutableArray array];
  [arrayOfConstraints
      addObjectsFromArray:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|[navBar]|"
                                                                  options:0
                                                                  metrics:nil
                                                                    views:viewBindings]];
  [arrayOfConstraints
      addObjectsFromArray:[NSLayoutConstraint constraintsWithVisualFormat:@"V:|[navBar]"
                                                                  options:0
                                                                  metrics:nil
                                                                    views:viewBindings]];

  [self.view addConstraints:arrayOfConstraints];

  [self setupExampleViews];
}

- (BOOL)prefersStatusBarHidden {
  return YES;
}

- (void)viewWillAppear:(BOOL)animated {
  [super viewWillAppear:animated];

  [self.navigationController setNavigationBarHidden:YES animated:animated];
}

@end