UIAlertController

来源：互联网发布：象屿集团怎么样知乎编辑：程序博客网时间：2024/06/06 14:07

1.创建UIAlertController *alert =[UIAlertController alertControllerWithTitle: @“警告"  message:@"出错了!"  preferredStyle:

        UIAlertControllerStyleAlert];2.添加textField  [alert  addTextFieldWithConfigurationHandler:^(UITextField * _Nonnull textField){

   // 设置TextField的属性    textField.placeholder = @"倪灏";    // 实时监控textField的内容    [[NSNotificationCenter defaultCenter]  addObserver:self  selector:  @selector(changeAlertValue:)  name:             UITextFieldTextDidChangeNotificationobject:textField];    }];3. 添加按钮       // 创建按钮    UIAlertAction *action = [UIAlertAction actionWithTitle:@"确定" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {  // 点击获取textField里的内容  UITextField *textField = [alert.textFields firstObject];  NSLog(@"textField :%@",textField.text);    }];   // 添加按钮   [alert addAction:action];    // 设置按钮不可点击    action.enabled = NO;    // 显示AlertController    [self presentViewController:alert animated:YES completion:^{}];4.实现实时监控TextField内容的方法- (void)changeAlertValue:(NSNotification *)notification{    // 找到AlertController  UIAlertController *alert = (UIAlertController *) self.presentedViewController;   // 找到TextField    UITextField *textField = [alert.textFields firstObject];   // 找到按钮   UIAlertAction *action = [alert.actions firstObject];    // 长度大于4时设置按钮可点击    action.enabled = textField.text.length > 4;}

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