iOS8 AlertView 改变 引入了UIAlertController

 iOS8 中引入了UIAlertController来取代以前的alertVIew 和actionSheet，把它们两个封装在了一起。具体用法如下所示

UIAlertController *alertController = [UIAlertController alertControllerWithTitle:nil message:@"邮箱格式有误,请重新输入" preferredStyle:UIAlertControllerStyleAlert];        [alertController addAction:[UIAlertAction actionWithTitle:@"确认" style:UIAlertActionStyleDefault handler:nil]];        [[UIView appearanceWhenContainedIn:[UIAlertController class], nil] setTintColor:[UIColor colorWithRed:0.90f green:0.26f blue:0.45f alpha:1.00f]];        [self presentViewController:alertController animated:YES completion:^{                    }];

上面    [[UIView appearanceWhenContainedIn:[UIAlertControllerclass], nil]setTintColor:[UIColor redColor];的意思是设置“确认” 按钮的tintColor 。