UIAlertController类学习

  UIAlertController用于替代UIActionSheet 和 UIAlertView。

替代UIActionSheet ：

UIAlertController * Alert = [UIAlertController 

                                   alertControllerWithTitle:@"Are you sure?" //标题

message:nil //标题下的信息

preferredStyle:UIAlertControllerStyleActionSheet//这里选择ActionSheet风格

];

    //新建一个动作

    UIAlertAction *noWayAction = [UIAlertAction actionWithTitle:@"No way!" //标题

style:UIAlertActionStyleCancel //动作类型

handler:

^(UIAlertAction *action) { NSLog(@"cancel button pressed");}];

    [Alert addAction:noWayAction];//把动作添加到控制器中

     //新建一个动作

    UIAlertAction *yesAction = [UIAlertAction actionWithTitle:@"Yes,i'm Sure!" 

style:UIAlertActionStyleDestructive 

handler:nil];

    [Alert addAction:yesAction];

    [self presentViewController:Alert animated:YES completion:nil];//以动画的方式显示

替代UIAlertView：

NSString *msg = nil;

        if(_nameField.text.length >0)

            msg = [NSStringstringWithFormat:@"You can breath easy, %@, everthing went OK.",_nameField.text];

        else

            msg = [NSStringstringWithFormat:@"You can breath easy. everything went OK."];

        

        UIAlertController *Alert1 = [UIAlertControlleralertControllerWithTitle:@"Something was done" 

message:msg 

preferredStyle:UIAlertControllerStyleAlert//这里选择Alert风格

];

        

        UIAlertAction *OKAction = [UIAlertActionactionWithTitle:@"Phew"style:UIAlertActionStyleDefaulthandler:nil];

        

        [Alert1 addAction:OKAction];

        

        [selfpresentViewController:Alert1animated:YEScompletion:nil];

UIAlertControllerStyle：

typedef enumUIAlertControllerStyle:NSInteger {

   UIAlertControllerStyleActionSheet =0,//actionSheet风格

   UIAlertControllerStyleAlert//Alert风格

} UIAlertControllerStyle;

UIAlertActionStyle：

typedef enumUIAlertActionStyle:NSInteger {

   UIAlertActionStyleDefault =0,//默认

   UIAlertActionStyleCancel,//取消

   UIAlertActionStyleDestructive//确认

} UIAlertActionStyle;