对于ios-无论视图层次如何，都在所有内容之上显示UIAlertController感兴趣的读者，本文将提供您所需要的所有信息，并且为您提供关于iOS-UIAlertController三种显示提示框
对于ios-无论视图层次如何，都在所有内容之上显示UIAlertController感兴趣的读者，本文将提供您所需要的所有信息，并且为您提供关于iOS - UIAlertController三种显示提示框代码、ios UIAlertController、IOS UIAlertController 弹出框中添加视图（例如日期选择器等等）、iOS UIAlertController 弹出问题的宝贵知识。
本文目录一览：- ios-无论视图层次如何，都在所有内容之上显示UIAlertController
- iOS - UIAlertController三种显示提示框代码
- ios UIAlertController
- IOS UIAlertController 弹出框中添加视图（例如日期选择器等等）
- iOS UIAlertController 弹出问题
ios-无论视图层次如何，都在所有内容之上显示UIAlertController
我正在尝试提供一个帮助类，以呈现一个UIAlertController。由于它是一个帮助器类，因此我希望它能在不考虑视图层次结构的情况下正常工作，并且没有有关它的信息。我能够显示警报，但是当它被关闭时，该应用程序崩溃并显示：
*** Terminating app due to uncaught exception ''NSInternalInconsistencyException'',reason: ''Trying to dismiss UIAlertController <UIAlertController: 0x135d70d80> with unknown presenter.''我用以下方法创建弹出窗口：
guard let window = UIApplication.shared.keyWindow else { return }let view = UIView()view.isUserInteractionEnabled = truewindow.insertSubview(view, at: 0)window.bringSubview(toFront: view)// add full screen constraints to view ...let controller = UIAlertController( title: "confirm deletion?", message: ":)", preferredStyle: .alert)let deleteAction = UIAlertAction( title: "yes", style: .destructive, handler: { _ in DispatchQueue.main.async { view.removeFromSuperview() completion() } })controller.addAction(deleteAction)view.insertSubview(controller.view, at: 0)view.bringSubview(toFront: controller.view)// add centering constraints to controller.view ...当我点击时yes，应用程序将崩溃，并且在崩溃之前未单击处理程序。我无法显示，UIAlertController因为这将取决于当前视图层次结构，而我希望弹出窗口是独立的
编辑：快速解决方案感谢@Vlad的想法。似乎在单独的窗口中操作要简单得多。所以这是一个可行的Swift解决方案：
class Popup { private var alertWindow: UIWindow static var shared = Popup() init() { alertWindow = UIWindow(frame: UIScreen.main.bounds) alertWindow.rootViewController = UIViewController() alertWindow.windowLevel = UIWindowLevelAlert + 1 alertWindow.makeKeyAndVisible() alertWindow.isHidden = true } private func show(completion: @escaping ((Bool) -> Void)) { let controller = UIAlertController( title: "Want to do it?", message: "message", preferredStyle: .alert ) let yesAction = UIAlertAction( title: "Yes", style: .default, handler: { _ in DispatchQueue.main.async { self.alertWindow.isHidden = true completion(true) } }) let noAction = UIAlertAction( title: "Not now", style: .destructive, handler: { _ in DispatchQueue.main.async { self.alertWindow.isHidden = true completion(false) } }) controller.addAction(noAction) controller.addAction(yesAction) self.alertWindow.isHidden = false alertWindow.rootViewController?.present(controller, animated: false) }}答案1
小编典典2019年12月16日更新：
只需显示当前最顶层视图控制器中的视图控制器/警报即可。那可行 ：）
if #available(iOS 13.0, *) { if var topController = UIApplication.shared.keyWindow?.rootViewController { while let presentedViewController = topController.presentedViewController { topController = presentedViewController } topController.present(self, animated: true, completion: nil)}2019年7月23日更新：
重要
显然，此技术下的方法 已在iOS 13.0中停止工作 ：(
我会在有时间调查时会更新…
旧技术：
这是它的Swift（5）扩展：
public extension UIAlertController { func show() { let win = UIWindow(frame: UIScreen.main.bounds) let vc = UIViewController() vc.view.backgroundColor = .clear win.rootViewController = vc win.windowLevel = UIWindow.Level.alert + 1 // Swift 3-4: UIWindowLevelAlert + 1 win.makeKeyAndVisible() vc.present(self, animated: true, completion: nil) }}只需设置您的UIAlertController，然后调用：
alert.show()不再受View Controllers层次结构的约束！
iOS - UIAlertController三种显示提示框代码
UIAlertView在IOS 8以上版本已经过时了，官方推荐我们使用UIAlertController代替UIAlertView、UIActionSheet
1､UIAlertController显示普通的Alert
- (IBAction)showAlert:(UIButton *)sender {
//显示提示框
//过时
// UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Title" message:@"message" delegate:self cancelButtonTitle:@"cancel" otherButtonTitles:@"ok", nil];
// [alert show];
UIAlertController* alert = [UIAlertController alertControllerWithTitle:@"Title"
message:@"This is an alert."
preferredStyle:UIAlertControllerStyleAlert];
UIAlertAction* defaultAction = [UIAlertAction actionWithTitle:@"OK" style:UIAlertActionStyleDefault
handler:^(UIAlertAction * action) {
//响应事件
NSLog(@"action = %@", action);
}];
UIAlertAction* cancelAction = [UIAlertAction actionWithTitle:@"Cancel" style:UIAlertActionStyleDefault
handler:^(UIAlertAction * action) {
//响应事件
NSLog(@"action = %@", action);
}];
[alert addAction:defaultAction];
[alert addAction:cancelAction];
[self presentViewController:alert animated:YES completion:nil];
}
2､UIAlertController显示带文本输入的的Alert
- (IBAction)showList:(UIButton *)sender {
//提示框添加文本输入框
UIAlertController* alert = [UIAlertController alertControllerWithTitle:@"Title"
message:@"This is an alert."
preferredStyle:UIAlertControllerStyleAlert];
UIAlertAction* okAction = [UIAlertAction actionWithTitle:@"OK" style:UIAlertActionStyleDefault
handler:^(UIAlertAction * action) {
//响应事件
//得到文本信息
for(UITextField *text in alert.textFields){
NSLog(@"text = %@", text.text);
}
}];
UIAlertAction* cancelAction = [UIAlertAction actionWithTitle:@"Cancel" style:UIAlertActionStyleCancel
handler:^(UIAlertAction * action) {
//响应事件
NSLog(@"action = %@", alert.textFields);
}];
[alert addTextFieldWithConfigurationHandler:^(UITextField *textField) {
textField.placeholder = @"登录";
}];
[alert addTextFieldWithConfigurationHandler:^(UITextField *textField) {
textField.placeholder = @"密码";
textField.secureTextEntry = YES;
}];
[alert addAction:okAction];
[alert addAction:cancelAction];
[self presentViewController:alert animated:YES completion:nil];
}
3､UIAlertController显示ActionSheet
- (IBAction)showSheet:(UIButton *)sender {
//显示弹出框列表选择
UIAlertController* alert = [UIAlertController alertControllerWithTitle:@"Title"
message:@"This is an Sheet."
preferredStyle:UIAlertControllerStyleActionSheet];
UIAlertAction* cancelAction = [UIAlertAction actionWithTitle:@"取消" style:UIAlertActionStyleCancel
handler:^(UIAlertAction * action) {
//响应事件
NSLog(@"action = %@", action);
}];
UIAlertAction* deleteAction = [UIAlertAction actionWithTitle:@"删除" style:UIAlertActionStyleDestructive
handler:^(UIAlertAction * action) {
//响应事件
NSLog(@"action = %@", action);
}];
UIAlertAction* saveAction = [UIAlertAction actionWithTitle:@"保存" style:UIAlertActionStyleDefault
handler:^(UIAlertAction * action) {
//响应事件
NSLog(@"action = %@", action);
}];
[alert addAction:saveAction];
[alert addAction:cancelAction];
[alert addAction:deleteAction];
[self presentViewController:alert animated:YES completion:nil];
}
ios UIAlertController
提示框
- (void)login{
UIAlertController * alertController = [UIAlertController alertControllerWithTitle: nil message: nil preferredStyle:UIAlertControllerStyleActionSheet];
//添加Button
[alertController addAction: [UIAlertAction actionWithTitle: @"拍照" style: UIAlertActionStyleDefault handler:^(UIAlertAction *action) {
//处理点击拍照
}]];
[alertController addAction: [UIAlertAction actionWithTitle: @"从相册选取" style: UIAlertActionStyleDefault handler:^(UIAlertAction *action){
//处理点击从相册选取
}]];
[alertController addAction: [UIAlertAction actionWithTitle: @"取消" style: UIAlertActionStyleCancel handler:nil]];
[self presentViewController: alertController animated: YES completion: nil];
}警告框
- (void)zhuce
{
UIAlertController * alertController = [UIAlertController alertControllerWithTitle: @"登陆"
message: @"输入用户名密码"
preferredStyle:UIAlertControllerStyleAlert];
[alertController addTextFieldWithConfigurationHandler:^(UITextField *textField) {
textField.placeholder = @"name";
textField.textColor = [UIColor blueColor];
textField.clearButtonMode = UITextFieldViewModeWhileEditing;
textField.borderStyle = UITextBorderStyleRoundedRect;
}];
[alertController addTextFieldWithConfigurationHandler:^(UITextField *textField) {
textField.placeholder = @"password";
textField.textColor = [UIColor blueColor];
textField.clearButtonMode = UITextFieldViewModeWhileEditing;
textField.borderStyle = UITextBorderStyleRoundedRect;
textField.secureTextEntry = YES;
}];
[alertController addAction:[UIAlertAction actionWithTitle:@"OK" style:UIAlertActionStyleDefault handler:^(UIAlertAction *action) {
NSArray * textfields = alertController.textFields;
UITextField * namefield = textfields[0];
UITextField * passwordfiled = textfields[1];
NSLog(@"%@:%@",namefield.text,passwordfiled.text);
}]];
[self presentViewController:alertController animated:YES completion:nil];
}使用的步骤
第一步 初始化
+ (instancetype)alertControllerWithTitle:(NSString *)title
message:(NSString *)message
preferredStyle:(UIAlertControllerStyle)preferredStyle
这里的 preferredStyle 有两种，sheet 和 alert
typedef enum UIAlertControllerStyle: NSInteger {
UIAlertControllerStyleActionSheet = 0,
UIAlertControllerStyleAlert
} UIAlertControllerStyle;
第二步，添加 Action（button 或者 textfield）
添加 Button
- (void)addAction:(UIAlertAction *)action
这里的 UIAlertAction 是一个比较简单的类
+ (instancetype)actionWithTitle:(NSString *)title
style:(UIAlertActionStyle)style
handler:(void (^)(UIAlertAction *action))handler
style 有三种
typedef enum UIAlertActionStyle: NSInteger {
UIAlertActionStyleDefault = 0,//默认
UIAlertActionStyleCancel,//取消
UIAlertActionStyleDestructive //有可能改变或者数据
} UIAlertActionStyle;
添加 TextField
注意，只能是 UIAlertControllerStyleAlert 才能添加 Textfield
- (void)addTextFieldWithConfigurationHandler:(void (^)(UITextField *textField))configurationHandler
在 block 里配置 textfield 的信息，例如 placeholder，backgroundcolor 等。
Textfield 的保存信息可由 UIAlertController 的属性 Textfields 获得。如同上述的例子二一样。
第三步，显示
例如
[self presentViewController:alert animated:YES completion:nil];
IOS UIAlertController 弹出框中添加视图（例如日期选择器等等）
UIDatePicker *datePicker = [[UIDatePicker alloc] init]; datePicker.datePickerMode = UIDatePickerModeDate;
UIAlertController *alert = [UIAlertController alertControllerWithTitle:@"\n\n\n\n\n\n\n\n\n\n\n\n" message:nil preferredStyle:UIAlertControllerStyleActionSheet];
[alert.view addSubview:datePicker];
UIAlertAction *ok = [UIAlertAction actionWithTitle:@"确定" style:UIAlertActionStyleDefault handler:^(UIAlertAction *action) {
NSDateFormatter* dateFormat = [[NSDateFormatter alloc] init];
//实例化一个NSDateFormatter对象
[dateFormat setDateFormat:@"yyyy-MM-dd"];//设定时间格式
NSString *dateString = [dateFormat stringFromDate:datePicker.date];
//求出当天的时间字符串
NSLog(@"%@",dateString);
}];
UIAlertAction *cancel = [UIAlertAction actionWithTitle:@"取消" style:UIAlertActionStyleDefault handler:^(UIAlertAction *action) {
}];
[alert addAction:ok];
[alert addAction:cancel];
[self presentViewController:alert animated:YES completion:^{ }];需要注意的是，这里没有设置地区时间
[datePicker setLocale:[[NSLocale alloc]initWithLocaleIdentifier:@"zh_Hans_CN"]];
iOS UIAlertController 弹出问题
xcode 7.1 下弹出 UIalertController , 无法弹出,报 Attempt to present <UIAlertController: 0x7fe20bfe03b0> on <ViewController: 0x7fe20bfda980> whose view is not in the window hierarchy!
警告,如果添加 UINavigationController 后,UIalertController 可以弹出, 但报 Presenting view controllers on detached view controllers is discouraged 警告,该如何解决
我们今天的关于ios-无论视图层次如何，都在所有内容之上显示UIAlertController的分享就到这里，谢谢您的阅读，如果想了解更多关于iOS - UIAlertController三种显示提示框代码、ios UIAlertController、IOS UIAlertController 弹出框中添加视图（例如日期选择器等等）、iOS UIAlertController 弹出问题的相关信息，可以在本站进行搜索。
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