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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02-06 22:04