在UIAlertController之外轻触如何解除UIAlertController？
在UIAlertController之外轻触如何解除UIAlertController ？
我可以添加UIAlertAction的UIAlertActionStyleCancel来closuresUIAlertController 。
但是我想添加一个函数，当用户点击UIAlertController ， UIAlertController会解散。 怎么做？ 谢谢。
使用样式UIAlertActionStyleCancel添加单独的取消操作。 所以，当用户在户外，你会得到callback。
UIAlertController *alertController = [UIAlertController alertControllerWithTitle:@"Alert Title" message:@"A Message" preferredStyle:UIAlertControllerStyleActionSheet]; [alertController addAction:[UIAlertAction actionWithTitle:@"Cancel" style:UIAlertActionStyleCancel handler:^(UIAlertAction *action) { // Called when user taps outside }]];
–
如果你使用的是swift，你可以使用下面的代码片断：
func showAlertBtnClicked(sender: UIButton) { let alert = UIAlertController(title: "This is title", message: "This is message", preferredStyle: .Alert) self.presentViewController(alert, animated: true, completion:{ alert.view.superview?.userInteractionEnabled = true alert.view.superview?.addGestureRecognizer(UITapGestureRecognizer(target: self, action: #selector(self.alertControllerBackgroundTapped))) }) } func alertControllerBackgroundTapped() { self.dismissViewControllerAnimated(true, completion: nil) }
随着迅捷3：
func showAlertBtnClicked(sender: UIButton) { let alert = UIAlertController(title: "This is title", message: "This is message", preferredStyle: .alert) self.present(alert, animated: true) { alert.view.superview?.isUserInteractionEnabled = true alert.view.superview?.addGestureRecognizer(UITapGestureRecognizer(target: self, action: #selector(self.alertControllerBackgroundTapped))) } } func alertControllerBackgroundTapped() { self.dismiss(animated: true, completion: nil) }
如果你正在使用Swift ：
使用addAction(_:)和style:UIAlertActionStyle.Cancel添加一个动作。
当你点击button或在框架外面时，将会调用处理程序。
var alertVC = UIAlertController(...) // initialize your Alert View Controller alertVC.addAction(UIAlertAction(title: "Cancel", style: UIAlertActionStyle.Cancel, handler: { (alertAction: UIAlertAction!) in alertVC.dismissViewControllerAnimated(true, completion: nil) }))
Objective-C ：
UIAlertController *alertController = [UIAlertController alertControllerWithTitle:...]; [alertController addAction:[UIAlertAction actionWithTitle:@"Cancel" style:UIAlertActionStyleCancel handler:^(UIAlertAction *action) { [alertVC dismissViewControllerAnimated:YES completion:nil]; }]];
UIView *alertView = self.alertController.view; UIView *superPuperView = self.alertController.view.superview; CGPoint tapCoord = [tap locationInView:superPuperView]; if (!CGRectContainsPoint(alertView.frame, tapCoord)) { //dismiss alert view }
最简单的方法是：
- (void)viewDidLoad { [super viewDidLoad]; [self button]; } - (void) button { UIButton * AlertButton = [UIButton buttonWithType:UIButtonTypeSystem]; [AlertButton setTitle:@"Button" forState:UIControlStateNormal]; AlertButton.frame = CGRectMake((self.view.frame.size.width/2) - 50 , (self.view.frame.size.height/2) - 25, 100, 50); [AlertButton addTarget:self action:@selector(Alert) forControlEvents:UIControlEventTouchUpInside]; [self.view addSubview:AlertButton]; } - (void)Alert { UIAlertController * alert = [UIAlertController alertControllerWithTitle:@"Alert Title" message:@"Alert Message" preferredStyle:UIAlertControllerStyleAlert]; [self presentViewController: alert animated: YES completion:^{ alert.view.superview.userInteractionEnabled = YES; [alert.view.superview addGestureRecognizer:[[UITapGestureRecognizer alloc] initWithTarget: self action: @selector(DismissAlertByTab)]]; }]; } - (void)DismissAlertByTab { [self dismissViewControllerAnimated: YES completion: nil]; }
Obj-C最简单的方法是：
UIAlertController *alert = [UIAlertController alertControllerWithTitle: ... [self presentViewController:alert animated:YES completion:^{ [alert.view.superview addGestureRecognizer:[[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(alertControllerBackgroundTapped)]]; }];
接着：
- (void)alertControllerBackgroundTapped { [self dismissViewControllerAnimated: YES completion: nil]; }
如果您查看警报的超级视图的debugging，你会看到它不像添加一个轻拍手势识别器的UITransitionView的_UIAlertControllerViewView.You可以做到这一点
[presenter presentViewController:alertController animated:YES completion:^{ NSArray <UIView *>* superviewSubviews = alertController.view.superview.subviews; for (UIView *subview in superviewSubviews) { if (CGRectEqualToRect(subview.bounds, weakSelf.view.bounds)) { [subview addSingleTapGestureWithTarget:weakSelf action:@selector(dismissModalTestViewController)]; } } }];
- (void)addBackgroundDismissTapForAlert:(UIAlertController *)alert { if (!alert.view.superview) { return; } alert.view.superview.userInteractionEnabled = YES; [alert.view.superview addGestureRecognizer:[[UITapGestureRecognizer alloc] initWithTarget: self action: @selector(alertControllerBackgroundTapped)]]; for (UIView *subV in alert.view.superview.subviews) { if (subV.width && subV.height) { subV.userInteractionEnabled = YES; [subV addGestureRecognizer:[[UITapGestureRecognizer alloc] initWithTarget: self action: @selector(alertControllerBackgroundTapped)]]; } } } - (void)alertControllerBackgroundTapped { [self dismissViewControllerAnimated: YES completion: nil]; }