webView与navigationController公用返回键

最新推荐文章于 2025-04-09 10:27:49 发布

ffffjr

最新推荐文章于 2025-04-09 10:27:49 发布

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分类专栏： webView 文章标签： ios oc webView

本文链接：https://blog.youkuaiyun.com/ffffjr/article/details/52787936

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本文探讨了如何在iOS应用中处理webView与navigationController的返回操作，实现两者共用同一个返回键，优化用户体验。通过设置navigationBar的backBarButtonItem，我们可以确保点击返回时既能退出webView的页面浏览，也能在多个视图间顺畅切换。

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// 主要重写UINavigationBarDelegate的方法

#import <UIKit/UIKit.h>

@protocol BackButtonHandlerProtocol <NSObject>
@optional
// Override this method in UIViewController derived class to handle 'Back' button click
-(BOOL)navigationShouldPopOnBackButton;
@end

@interface UIViewController (BackButtonHandler) <BackButtonHandlerProtocol>

@end

#import "UIViewController+BackButtonHandler.h"

@implementation UIViewController (BackButtonHandler)

@end

@implementation UINavigationController (ShouldPopOnBackButton)

- (BOOL)navigationBar:(UINavigationBar *)navigationBar shouldPopItem:(UINavigationItem *)item {

	if([self.viewControllers count] < [navigationBar.items count]) {
		return YES;
	}

	BOOL shouldPop = YES;
	UIViewController* vc = [self topViewController];
	if([vc respondsToSelector:@selector(navigationShouldPopOnBackButton)]) {
		shouldPop = [vc navigationShouldPopOnBackButton];
	}

	if(shouldPop) {
		dispatch_async(dispatch_get_main_queue(), ^{
			[self popViewControllerAnimated:YES];
		});
	} else {
		
		for(UIView *subview in [navigationBar subviews]) {
			if(0. < subview.alpha && subview.alpha < 1.) {
				[UIView animateWithDuration:.25 animations:^{
					subview.alpha = 1.;
				}];
			}
		}
	}
	return NO;
}

@end