UIAlertController 使用

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//UIActionSheet is deprecated. Use UIAlertController with a preferredStyle of UIAlertControllerStyleActionSheet instead

UIActionSheet弃用。使用UIAlertController preferredStyle UIAlertControllerStyleActionSheet替换。

//UIAlertView is deprecated. Use UIAlertController with a preferredStyle of UIAlertControllerStyleAlert instead

UIAlertView弃用。使用UIAlertController preferredStyle UIAlertControllerStyleAlert替换

UIAlertController同时替代了 UIAlertView 和 UIActionSheet

UIAlertController对象向用户显示一个警告消息。这个类替换UIActionSheet和UIAlertView类显示警报。

使用警报控制器后必须设置行为和风格,目前使用presentViewController:animated:completion:方法。

除了向用户提示一个消息,你还可以做其他事情。为每个控件添加addAction:方法,监听动作细节。

当用户操作时,UIAlertController创建动作对象时，执行block中内容。

官方使用样例:

UIAlertController* alert = [UIAlertController alertControllerWithTitle:@"My Alert"                               message:@"This is an alert."                               preferredStyle:UIAlertControllerStyleAlert]; UIAlertAction* defaultAction = [UIAlertAction actionWithTitle:@"OK" style:UIAlertActionStyleDefault   handler:^(UIAlertAction * action) {}]; [alert addAction:defaultAction];[self presentViewController:alert animated:YES completion:nil];

UIActionSheet使用

UIAlertControllerStyleActionSheet的使用注意

1.不能有文本框

2.在iPad中,必须使用popover的形式展示

    UIAlertController *alert = [UIAlertController alertControllerWithTitle:@"警告" message:@"你有严重的精神病,赶紧去治疗" preferredStyle:UIAlertControllerStyleActionSheet];    // 设置popover指向的item    alert.popoverPresentationController.barButtonItem = self.navigationItem.leftBarButtonItem;        // 添加按钮    [alert addAction:[UIAlertAction actionWithTitle:@"确定" style:UIAlertActionStyleDestructive handler:^(UIAlertAction *action) {        NSLog(@"点击了确定按钮");    }]];    [alert addAction:[UIAlertAction actionWithTitle:@"取消" style:UIAlertActionStyleCancel handler:^(UIAlertAction *action) {        NSLog(@"点击了取消按钮");    }]];        [self presentViewController:alert animated:YES completion:nil];

Text fields can only be added to an alert controller of style UIAlertControllerStyleAlert

只能在UIAlertControllerStyleAlert样式的view上添加文本框

UIAlertView使用

    // 危险操作:弹框提醒    // 1.UIAlertView    // 2.UIActionSheet    // iOS8开始:UIAlertController == UIAlertView + UIActionSheet    UIAlertController *alert = [UIAlertController alertControllerWithTitle:@"警告" message:@"你有严重的精神病,赶紧去治疗" preferredStyle:UIAlertControllerStyleAlert];        // 添加按钮    __weak typeof(alert) weakAlert = alert;    [alert addAction:[UIAlertAction actionWithTitle:@"确定" style:UIAlertActionStyleDestructive handler:^(UIAlertAction *action) {        NSLog(@"点击了确定按钮--%@-%@", [weakAlert.textFields.firstObject text], [weakAlert.textFields.lastObject text]);    }]];    [alert addAction:[UIAlertAction actionWithTitle:@"取消" style:UIAlertActionStyleCancel handler:^(UIAlertAction *action) {        NSLog(@"点击了取消按钮");    }]];        // 添加文本框    [alert addTextFieldWithConfigurationHandler:^(UITextField *textField) {        textField.textColor = [UIColor redColor];        textField.text = @"123";        [textField addTarget:self action:@selector(usernameDidChange:) forControlEvents:UIControlEventEditingChanged];        //        [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(usernameDidChange:) name:UITextFieldTextDidChangeNotification object:textField];    }];    [alert addTextFieldWithConfigurationHandler:^(UITextField *textField) {        textField.secureTextEntry = YES;        textField.text = @"123";    }];        [self presentViewController:alert animated:YES completion:nil];

- (void)usernameDidChange:(UITextField *)username{    NSLog(@"%@", username.text);}

ios8之前用法

    UIActionSheet *sheet = [[UIActionSheet alloc] initWithTitle:@"警告:你有严重的精神病,赶紧去治疗" delegate:nil cancelButtonTitle:@"取消" destructiveButtonTitle:@"确定"                                              otherButtonTitles:@"关闭", nil];    [sheet showInView:self.view];

    UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"警告" message:@"你有严重的精神病,赶紧去治疗" delegate:nil cancelButtonTitle:@"取消" otherButtonTitles:@"确定", nil];    alert.alertViewStyle = UIAlertViewStyleLoginAndPasswordInput;    [alert show];

感谢李明杰老师。

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