components/AppBar/examples/AppBarWKWebViewLargeContentExample.m - external/github.com/material-components/material-components-ios - Git at Google

 // Copyright 2018-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 <WebKit/WebKit.h>

 #import "MaterialAppBar.h"
 #import "MaterialAppBar+ColorThemer.h"
 #import "MaterialAppBar+TypographyThemer.h"

 // This demonstrates that a WKWebView with large content as the tracking scroll view is able to
 // scroll as expected, even with the useAdditionalSafeAreaInsetsForWebKitScrollViews flag enabled.

 @interface AppBarWKWebViewLargeContentExample : UIViewController

 @property(nonatomic, strong) MDCAppBar *appBar;
 @property(nonatomic, strong) MDCSemanticColorScheme *colorScheme;
 @property(nonatomic, strong) MDCTypographyScheme *typographyScheme;

 @end

 @implementation AppBarWKWebViewLargeContentExample

 - (void)dealloc {
   // Required for pre-iOS 11 devices because we've enabled observesTrackingScrollViewScrollEvents.
   self.appBar.headerViewController.headerView.trackingScrollView = nil;
 }

 - (id)init {
   self = [super init];
   if (self) {
     self.title = @"App Bar";

     _appBar = [[MDCAppBar alloc] init];

     // Behavioral flags.
     _appBar.inferTopSafeAreaInsetFromViewController = YES;
     _appBar.headerViewController.topLayoutGuideViewController = self;
     _appBar.headerViewController.headerView.minMaxHeightIncludesSafeArea = NO;
     _appBar.headerViewController.headerView.observesTrackingScrollViewScrollEvents = YES;

     _appBar.headerViewController.useAdditionalSafeAreaInsetsForWebKitScrollViews = YES;

     [self addChildViewController:_appBar.headerViewController];

     _appBar.navigationBar.inkColor = [UIColor colorWithWhite:(CGFloat)0.9 alpha:(CGFloat)0.1];

     self.colorScheme =
         [[MDCSemanticColorScheme alloc] initWithDefaults:MDCColorSchemeDefaultsMaterial201804];
     self.typographyScheme = [[MDCTypographyScheme alloc] init];
   }
   return self;
 }

 - (void)viewDidLoad {
   [super viewDidLoad];

   [MDCAppBarColorThemer applySemanticColorScheme:self.colorScheme toAppBar:_appBar];
   [MDCAppBarTypographyThemer applyTypographyScheme:self.typographyScheme toAppBar:_appBar];

   // Need to update the status bar style after applying the theme.
   [self setNeedsStatusBarAppearanceUpdate];

   WKWebViewConfiguration *config = [[WKWebViewConfiguration alloc] init];
   WKWebView *webView = [[WKWebView alloc] initWithFrame:self.view.bounds configuration:config];
   [self.view addSubview:webView];

   NSMutableArray *content = [@[@"<html>\n<head></head><body>"] mutableCopy];
   for (NSInteger ix = 0; ix < 500; ++ix) {
     [content addObject:@"<p>Hello</p>"];
   }
   [content addObject:@"</body></html>"];
   [webView loadHTMLString:[content componentsJoinedByString:@"\n"] baseURL:nil];

   if (@available(iOS 11.0, *)) {
     // No need to do anything - additionalSafeAreaInsets will inset our content.
     webView.autoresizingMask = (UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight);
   } else {
   webView.translatesAutoresizingMaskIntoConstraints = NO;
   [NSLayoutConstraint activateConstraints:
    @[[NSLayoutConstraint constraintWithItem:webView
                                   attribute:NSLayoutAttributeTop
                                   relatedBy:NSLayoutRelationEqual
                                      toItem:self.topLayoutGuide
                                   attribute:NSLayoutAttributeBottom
                                  multiplier:1.0
                                    constant:0],
      [NSLayoutConstraint constraintWithItem:webView
                                   attribute:NSLayoutAttributeBottom
                                   relatedBy:NSLayoutRelationEqual
                                      toItem:self.view
                                   attribute:NSLayoutAttributeBottom
                                  multiplier:1.0
                                    constant:0],
      [NSLayoutConstraint constraintWithItem:webView
                                   attribute:NSLayoutAttributeLeft
                                   relatedBy:NSLayoutRelationEqual
                                      toItem:self.view
                                   attribute:NSLayoutAttributeLeft
                                  multiplier:1.0
                                    constant:0],
      [NSLayoutConstraint constraintWithItem:webView
                                   attribute:NSLayoutAttributeRight
                                   relatedBy:NSLayoutRelationEqual
                                      toItem:self.view
                                   attribute:NSLayoutAttributeRight
                                  multiplier:1.0
                                    constant:0]
      ]];
   }
   self.appBar.headerViewController.headerView.trackingScrollView = webView.scrollView;
   [self.appBar addSubviewsToParent];
 }

 - (UIViewController *)childViewControllerForStatusBarHidden {
   return self.appBar.headerViewController;
 }

 - (UIViewController *)childViewControllerForStatusBarStyle {
   return self.appBar.headerViewController;
 }

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

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

 @end

 @implementation AppBarWKWebViewLargeContentExample (CatalogByConvention)

 + (NSDictionary *)catalogMetadata {
   return @{
     @"breadcrumbs": @[ @"App Bar", @"WKWebView large content" ],
     @"primaryDemo": @NO,
     @"presentable": @NO,
   };
 }

 - (BOOL)catalogShouldHideNavigation {
   return YES;
 }

 @end
	// Copyright 2018-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 <WebKit/WebKit.h>

	#import "MaterialAppBar.h"
	#import "MaterialAppBar+ColorThemer.h"
	#import "MaterialAppBar+TypographyThemer.h"

	// This demonstrates that a WKWebView with large content as the tracking scroll view is able to
	// scroll as expected, even with the useAdditionalSafeAreaInsetsForWebKitScrollViews flag enabled.

	@interface AppBarWKWebViewLargeContentExample : UIViewController

	@property(nonatomic, strong) MDCAppBar *appBar;
	@property(nonatomic, strong) MDCSemanticColorScheme *colorScheme;
	@property(nonatomic, strong) MDCTypographyScheme *typographyScheme;

	@end

	@implementation AppBarWKWebViewLargeContentExample

	- (void)dealloc {
	// Required for pre-iOS 11 devices because we've enabled observesTrackingScrollViewScrollEvents.
	self.appBar.headerViewController.headerView.trackingScrollView = nil;
	}

	- (id)init {
	self = [super init];
	if (self) {
	self.title = @"App Bar";

	_appBar = [[MDCAppBar alloc] init];

	// Behavioral flags.
	_appBar.inferTopSafeAreaInsetFromViewController = YES;
	_appBar.headerViewController.topLayoutGuideViewController = self;
	_appBar.headerViewController.headerView.minMaxHeightIncludesSafeArea = NO;
	_appBar.headerViewController.headerView.observesTrackingScrollViewScrollEvents = YES;

	_appBar.headerViewController.useAdditionalSafeAreaInsetsForWebKitScrollViews = YES;

	[self addChildViewController:_appBar.headerViewController];

	_appBar.navigationBar.inkColor = [UIColor colorWithWhite:(CGFloat)0.9 alpha:(CGFloat)0.1];

	self.colorScheme =
	[[MDCSemanticColorScheme alloc] initWithDefaults:MDCColorSchemeDefaultsMaterial201804];
	self.typographyScheme = [[MDCTypographyScheme alloc] init];
	}
	return self;
	}

	- (void)viewDidLoad {
	[super viewDidLoad];

	[MDCAppBarColorThemer applySemanticColorScheme:self.colorScheme toAppBar:_appBar];
	[MDCAppBarTypographyThemer applyTypographyScheme:self.typographyScheme toAppBar:_appBar];

	// Need to update the status bar style after applying the theme.
	[self setNeedsStatusBarAppearanceUpdate];

	WKWebViewConfiguration *config = [[WKWebViewConfiguration alloc] init];
	WKWebView *webView = [[WKWebView alloc] initWithFrame:self.view.bounds configuration:config];
	[self.view addSubview:webView];

	NSMutableArray *content = [@[@"<html>\n<head></head><body>"] mutableCopy];
	for (NSInteger ix = 0; ix < 500; ++ix) {
	[content addObject:@"<p>Hello</p>"];
	}
	[content addObject:@"</body></html>"];
	[webView loadHTMLString:[content componentsJoinedByString:@"\n"] baseURL:nil];

	if (@available(iOS 11.0, *)) {
	// No need to do anything - additionalSafeAreaInsets will inset our content.
	webView.autoresizingMask = (UIViewAutoresizingFlexibleWidth \| UIViewAutoresizingFlexibleHeight);
	} else {
	webView.translatesAutoresizingMaskIntoConstraints = NO;
	[NSLayoutConstraint activateConstraints:
	@[[NSLayoutConstraint constraintWithItem:webView
	attribute:NSLayoutAttributeTop
	relatedBy:NSLayoutRelationEqual
	toItem:self.topLayoutGuide
	attribute:NSLayoutAttributeBottom
	multiplier:1.0
	constant:0],
	[NSLayoutConstraint constraintWithItem:webView
	attribute:NSLayoutAttributeBottom
	relatedBy:NSLayoutRelationEqual
	toItem:self.view
	attribute:NSLayoutAttributeBottom
	multiplier:1.0
	constant:0],
	[NSLayoutConstraint constraintWithItem:webView
	attribute:NSLayoutAttributeLeft
	relatedBy:NSLayoutRelationEqual
	toItem:self.view
	attribute:NSLayoutAttributeLeft
	multiplier:1.0
	constant:0],
	[NSLayoutConstraint constraintWithItem:webView
	attribute:NSLayoutAttributeRight
	relatedBy:NSLayoutRelationEqual
	toItem:self.view
	attribute:NSLayoutAttributeRight
	multiplier:1.0
	constant:0]
	]];
	}
	self.appBar.headerViewController.headerView.trackingScrollView = webView.scrollView;
	[self.appBar addSubviewsToParent];
	}

	- (UIViewController *)childViewControllerForStatusBarHidden {
	return self.appBar.headerViewController;
	}

	- (UIViewController *)childViewControllerForStatusBarStyle {
	return self.appBar.headerViewController;
	}

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

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

	@end

	@implementation AppBarWKWebViewLargeContentExample (CatalogByConvention)

	+ (NSDictionary *)catalogMetadata {
	return @{
	@"breadcrumbs": @[ @"App Bar", @"WKWebView large content" ],
	@"primaryDemo": @NO,
	@"presentable": @NO,
	};
	}

	- (BOOL)catalogShouldHideNavigation {
	return YES;
	}

	@end