[英]Dismiss UIAlertControllerStyleAlert UIAlertController by tapping outside
[英]How to dismiss UIAlertController when tap outside the UIAlertController?
在UIAlertController
UIAlertController
我可以添加UIAlertAction
樣式UIAlertActionStyleCancel
來關閉UIAlertController
。
但我想添加當用戶在UIAlertController
UIAlertController
關閉的功能。 怎么做? 謝謝你。
如果您要定位iOS> 9.3並使用Swift並且preferredStyle為Alert的設備 ,則可以使用以下代碼段:
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)
}
隨着迅捷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)
}
使用樣式UIAlertActionStyleCancel
添加單獨的取消操作。 因此,當用戶點擊外部時,您將獲得回調。
OBJ-C
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
}]];
Swift 5.0
let alertController = UIAlertController(title: "Alert Title", message: "A Message", preferredStyle: .actionSheet)
alertController.addAction(UIAlertAction(title: "Cancel", style: .cancel, handler: {
action in
// Called when user taps outside
}))
為你的alertController提供動作,其中UIAlertAction
的風格是.cancel
let cancelAction = UIAlertAction(title: "Cancel", style: .cancel, handler: nil)
alertController.addAction(cancelAction)
使用此方法當用戶點擊取消操作按鈕以及alertController外部時,alertController將被解除。
如果您不希望用戶在alertController外部觸摸后解除alertController,請在當前方法的完成閉包中禁用alertController的第一個子視圖的用戶交互。
self.present(alertController, animated: true) {
alertController.view.superview?.subviews[0].isUserInteractionEnabled = false
}
如果您不想在控制器視圖中使用取消按鈕,並且想要在控制器視圖外部進行用戶修改時關閉控制器,請執行此操作
self.present(alertController, animated: true) {
let tapGesture = UITapGestureRecognizer(target: self, action: #selector(self.dismissAlertController))
alertController.view.superview?.subviews[0].addGestureRecognizer(tapGesture)
}
@objc func dismissAlertController(){
self.dismiss(animated: true, completion: nil)
}
如果您使用的是Swift :
使用addAction(_:)
和style:UIAlertActionStyle.Cancel
添加動作style:UIAlertActionStyle.Cancel
。
當點擊按鈕或框架外時,將調用`處理程序。
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];
}]];
斯威夫特4:
當用戶點擊使用UIAlertController創建的操作表外部時,關閉操作表
代碼片段:
// Declare Action Sheet reference
var actionSheet: UIAlertController!
// Init and Show Action Sheet
func showActionSheetClicked(sender: UIButton) {
// Init Action Sheet
actionSheet = UIAlertController(title: "Title", message: "Message", preferredStyle: .actionSheet)
self.present(actionSheet, animated: true) {
// Enabling Interaction for Transperent Full Screen Overlay
self.actionSheet.view.superview?.subviews.first?.isUserInteractionEnabled = true
// Adding Tap Gesture to Overlay
self.actionSheet.view.superview?.subviews.first?.addGestureRecognizer(UITapGestureRecognizer(target: self, action: #selector(self.actionSheetBackgroundTapped)))
}
}
// To dismiss Action Sheet on Tap
@objc func actionSheetBackgroundTapped() {
self.actionSheet.dismiss(animated: true, completion: nil)
}
Obj-C中最簡單的方法:
UIAlertController *alert = [UIAlertController alertControllerWithTitle: ...
[self presentViewController:alert animated:YES completion:^{
[alert.view.superview addGestureRecognizer:[[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(alertControllerBackgroundTapped)]];
}];
然后:
- (void)alertControllerBackgroundTapped
{
[self dismissViewControllerAnimated: YES
completion: nil];
}
- (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];
}
UIView *alertView = self.alertController.view;
UIView *superPuperView = self.alertController.view.superview;
CGPoint tapCoord = [tap locationInView:superPuperView];
if (!CGRectContainsPoint(alertView.frame, tapCoord)) {
//dismiss alert view
}
最簡單的方法:
- (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];
}
如果您查看調試警報的超級視圖,您會發現它不像在_UIAlertControllerView的UITransitionView中添加點擊手勢識別器那么簡單。您可以這樣做
[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)];
}
}
}];
在 iOS 15 上, UIAlertController
的視圖層次結構似乎再次發生了變化。 它顯示為包含控制器本身的新UIWindow
。 因此,為了在外面關閉水龍頭:
present(alertController, animated: true) { [weak self] in
guard let self = self else { return }
let dismissGesture = UITapGestureRecognizer(target: self, action: #selector(self.shouldDismiss))
self.alertController.view.window?.isUserInteractionEnabled = true
self.alertController.view.window?.addGestureRecognizer(dismissGesture)
}
對於shouldDismiss
函數:
@objc private func shouldDismiss() {
alertController.dismiss(animated: true)
}
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