https://github.com/wangrui460/backbtneventintercept
系统返回按钮事件拦截
https://github.com/wangrui460/backbtneventintercept
backbtnhandlersample backbutton shouldpop systemback
Last synced: 9 months ago
JSON representation
系统返回按钮事件拦截
- Host: GitHub
- URL: https://github.com/wangrui460/backbtneventintercept
- Owner: wangrui460
- License: mit
- Created: 2017-04-22T06:08:33.000Z (almost 9 years ago)
- Default Branch: master
- Last Pushed: 2021-07-09T09:58:57.000Z (over 4 years ago)
- Last Synced: 2025-05-05T08:06:41.476Z (9 months ago)
- Topics: backbtnhandlersample, backbutton, shouldpop, systemback
- Language: Objective-C
- Size: 16.6 KB
- Stars: 7
- Watchers: 1
- Forks: 4
- Open Issues: 1
-
Metadata Files:
- Readme: README.md
- License: LICENSE
Awesome Lists containing this project
README
## iOS 技术交流
我创建了一个 微信 iOS 技术交流群，欢迎小伙伴们加入一起交流学习~
可以加我微信我拉你进去（备注iOS），我的微信号 wr1204607318
## BackBtnEventIntercept
系统返回按钮事件拦截
[Swift 版本](https://github.com/wangrui460/BackBtnEventIntercept_swift)
- **主要实现原理**
@implementation UINavigationController (ShouldPopOnBackBtn)
- (BOOL)navigationBar:(UINavigationBar *)navigationBar shouldPopItem:(UINavigationItem *)item
{
BOOL shouldPop = YES;
// 看一下当前控制器有没有实现代理方法 currentViewControllerShouldPop
// 如果实现了，根据当前控制器的代理方法的返回值决定
// 没过没有实现 shouldPop = YES
UIViewController* currentVC = [self topViewController];
if([currentVC respondsToSelector:@selector(currentViewControllerShouldPop)]) {
shouldPop = [currentVC currentViewControllerShouldPop];
}
if(shouldPop)
{
dispatch_async(dispatch_get_main_queue(), ^{
[self popViewControllerAnimated:YES];
});
// 这里要return, 否则这个方法将会被再次调用
return YES;
}
else
{
// 让系统backIndicator 按钮透明度恢复为1
for(UIView *subview in [navigationBar subviews]) {
if(0. < subview.alpha && subview.alpha < 1.) {
[UIView animateWithDuration:.25 animations:^{
subview.alpha = 1.;
}];
}
}
return NO;
}
}
@end
- **如何使用**
// 第一步：导入分类头文件
#import "UIViewController+BackBtnEventIntercept.h"
// 第二步：实现代理方法，return NO 则拦截了系统的返回按钮事件
- (BOOL)currentViewControllerShouldPop
{
return NO;
}
- **如何禁用系统👉右滑返回手势**
- (void)viewDidAppear:(BOOL)animated
{
[super viewDidAppear:animated];
// 为当前控制器禁用👉右滑返回手势
if ([self.navigationController respondsToSelector:@selector(interactivePopGestureRecognizer)]) {
self.navigationController.interactivePopGestureRecognizer.enabled = NO;
}
}
- (void)viewWillDisappear:(BOOL)animated
{
[super viewWillDisappear:animated];
// 为其他控制器开启👉右滑返回手势
if ([self.navigationController respondsToSelector:@selector(interactivePopGestureRecognizer)]) {
self.navigationController.interactivePopGestureRecognizer.enabled = YES;
}
}
### 联系我
扫码回复1获取面试资料（持续更新）
