关于弹窗（UIAlerterViewController）的总结

当在一个多次要用到弹窗的时候，我们会觉得很麻烦每次都重写。于是自己创建一个单独的类来重写这个关于弹窗的方法，再用到的时候我们只需要倒入头文件，调用这个方法即可，比较方便。下面是一个小方法。

   #import "Alert.h"

   @implementation Alert

    +(void)alert:(NSString *)str andUIviewController:(UIViewController *)v completion:(void (^ )               (void))completion{

     UIAlertController *a =[UIAlertController alertControllerWithTitle:@"友情提示" message:str                preferredStyle:UIAlertControllerStyleAlert];

       UIAlertAction *ac =[UIAlertAction actionWithTitle:@"好的" style:UIAlertActionStyleDefault                handler:nil];

        [a addAction:ac];

        [v presentViewController:a animated:YES completion:completion];

         }

         @end

修改title和message的字体颜色和大小

     //修改title 

   NSString* titleStr =@"提示";

    NSMutableAttributedString *alertControllerStr = [[NSMutableAttributedString alloc]                          initWithString:titleStr];

     [alertControllerStr addAttribute:NSForegroundColorAttributeName value:[UIColor redColor]             range:NSMakeRange(0, titleStr.lenth)];

    [alertControllerStr addAttribute:NSFontAttributeName value:[UIFont systemFontOfSize:17]            range:NSMakeRange(0, titleStr.lenth)];

   if (alertController valueForKey:@"attributedTitle") {

   [alertController setValue:alertControllerStr forKey:@"attributedTitle"];

   }

//修改message

 NSString* messegeStr =@"提示内容";

 NSMutableAttributedString *alertControllerMessageStr = 

 [[NSMutableAttributedString alloc] initWithString:messegeStr];

 [alertControllerMessageStr addAttribute:NSForegroundColorAttributeName value:[UIColor              greenColor] range:NSMakeRange(0, messegeStr.lenth)]; 

  [alertControllerMessageStr addAttribute:NSFontAttributeName value:[UIFont                                  systemFontOfSize:20] range:NSMakeRange(0, messegeStr.lenth)];

   if (alertController valueForKey:@"attributedMessage") {

    [alertController setValue:alertControllerMessageStr forKey:@"attributedMessage"];

    }