IOS 中弹框的实现方法整理 #define iOS8Later ([UIDevice currentDevice].systemVersion.doubleValue = 8.0) ios 8以前的弹框 @interface RootViewController ()UIAlertViewDelegate @end UIAlertView * alert = [[UIAlertView alloc] initWit
          IOS 中弹框的实现方法整理
#define iOS8Later ([UIDevice currentDevice].systemVersion.doubleValue >= 8.0)
ios 8以前的弹框
@interface RootViewController ()<UIAlertViewDelegate> @end
UIAlertView * alert = [[UIAlertView alloc] initWithTitle:@"登陆失败" message:@"请重新输入用户名和密码" delegate:self cancelButtonTitle:@"取消" otherButtonTitles:@"确定", nil]; 
      [alert show]; 
#pragma mark - UIAlertView Delegate Methods - 
- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex 
{ 
  if(buttonIndex == 0) 
  { 
    NSLog(@"点击取消按钮后,想要的操作,可以加此处"); 
  } 
  else if(buttonIndex == 1) 
  { 
    NSLog(@"点击确定按钮后,想要的操作,可以加此处"); 
  } 
} 
ios8以后的弹框
      UIAlertController *_alertVC = [UIAlertController alertControllerWithTitle:@"登陆失败" message:@"请重新输入用户名和密码" preferredStyle:UIAlertControllerStyleAlert]; 
       
      //警告类型,红色字体 UIAlertActionStyleDestructive 
//      UIAlertAction *_doAction = [UIAlertAction actionWithTitle:@"确定" style:UIAlertActionStyleDestructive handler:nil]; 
//      [_alertVC addAction:_doAction]; 
       
      UIAlertAction *_doAction = [UIAlertAction actionWithTitle:@"确定" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) 
      { 
        NSLog(@"点击确定按钮后,想要的操作,可以加此处"); 
      }]; 
      [_alertVC addAction:_doAction]; 
 
//      UIAlertAction *_cancleAction = [UIAlertAction actionWithTitle:@"取消" style:UIAlertActionStyleCancel handler:nil]; 
//      [_alertVC addAction:_cancleAction]; 
       
      UIAlertAction *_cancleAction = [UIAlertAction actionWithTitle:@"取消" style:UIAlertActionStyleCancel handler:^(UIAlertAction * _Nonnull action) 
      { 
        NSLog(@"点击取消按钮后,想要的操作"); 
      }]; 
      [_alertVC addAction:_cancleAction]; 
       
      [self presentViewController:_alertVC animated:YES completion:nil]; 
//警告类型,红色字体 UIAlertActionStyleDestructive,如下图所示的效果
      UIAlertAction *_doAction = [UIAlertAction actionWithTitle:@"确定" style:UIAlertActionStyleDestructive handler:nil];
      [_alertVC addAction:_doAction];

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