UI<09>

//声明对象

@property (nonatomic,strong) UIAlertController *alertcontroller;

 

 
    //创建提示窗口 Title：标题 message：提示内容 Style:风格

    self.alertcontroller = [UIAlertController alertControllerWithTitle:@"提示" message:@"请按提示操作！" preferredStyle:UIAlertControllerStyleActionSheet];

 

    //实例化取消按钮
    UIAlertAction *cancelAction = [UIAlertAction actionWithTitle:@"取消" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
       
        NSLog(@"点击了取消...");
       
       
    }];
   
    //实例化确定按钮
    UIAlertAction *sureAction = [UIAlertAction actionWithTitle:@"确定" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
       

 

 

     //对按钮应用标准样式：  UIAlertActionStyleDefault
      //对按钮应用取消样式： UIAlertActionStyleCancel
      //对按钮应用警示性的样式：UIAlertActionStyleDestructive
       

        NSLog(@"点击了确定...");
       
    }];
   
    //实例化其他按钮
    UIAlertAction *otherAction = [UIAlertAction actionWithTitle:@"其他" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
       
        NSLog(@"点击了其他...");
       
    }];

   
    [_alertcontroller addAction:cancelAction];
    [_alertcontroller addAction:sureAction];
    [_alertcontroller addAction:otherAction];
    //弹出提示框
    [self presentViewController:self.alertcontroller animated:YES completion:nil];

 

 

 

包含输入框的模式：

 

    //创建提示窗口 Title：标题 message：提示内容 Style:风格
    self.alertcontroller = [UIAlertController alertControllerWithTitle:@"提示" message:@"请按提示操作！" preferredStyle:UIAlertControllerStyleAlert];
   
     __weak __typeof(&*self)weakSelf = self;//block 中防止循环引用
    [self.alertcontroller addTextFieldWithConfigurationHandler:^(UITextField * _Nonnull textField) {
        //通过通知监听textField的改变
        [[NSNotificationCenter defaultCenter] addObserver:weakSelf selector:@selector(alertTextFieldDidChange:) name:UITextFieldTextDidChangeNotification object:textField];
       
            textField.placeholder = @"请输入六位用户名";
       
    }];
   
   
    //实例化取消按钮
    UIAlertAction *cancelAction = [UIAlertAction actionWithTitle:@"取消" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
       
       
        NSLog(@"点击了取消...");
       
       
    }];
   
    //实例化确定按钮
    UIAlertAction *sureAction = [UIAlertAction actionWithTitle:@"确定" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
       
       
        [[NSNotificationCenter defaultCenter] removeObserver:self name:UITextFieldTextDidChangeNotification object:nil];
        //可以在这里获取textFields的信息
        NSString *userName =   self.alertcontroller.textFields.lastObject.text;
        NSLog(@"该用户名：%@",userName);
       
    }];
   
   
    [_alertcontroller addAction:cancelAction];
    [_alertcontroller addAction:sureAction];
    //弹出提示框
    [self presentViewController:self.alertcontroller animated:YES completion:nil];

 

 

 

- (void)alertTextFieldDidChange:(NSNotification *)notification{
   
    NSString *userName =   self.alertcontroller.textFields.lastObject.text;
    NSLog(@"该用户名：%@",userName);

   

}