这是用来弹出多重选项的，并且每个选项还可以自定义事件，这与uialert还不一样。

先看看它长啥样。

 

再说实现过程

在controller的.m中，先实现代理

@interface controllerA
     

然后添加事件，比如点击按钮的事件

-(void)clickBtn{    UIActionSheet *sheet = [[UIActionSheet alloc] initWithTitle:@"添加联系人" delegate:self cancelButtonTitle:@"取消" destructiveButtonTitle:nil otherButtonTitles:@"从通讯录添加",@"手动添加",@"从会议通讯录添加", nil];        [sheet showInView:self.view];//在当前view显示action sheet}

//每个选项的事件- (void)actionSheet:(UIActionSheet *)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex{    if (0 == buttonIndex) {
   // 从通讯录添加        ControllerB *b = [[ControllerB alloc] init];        b.delegate = self;        [self presentViewController:b animated:YES completion:nil];            }else if (1 == buttonIndex){
   // 手动添加        ControllerC *c = [[ControllerC alloc] init];        c.delegate = self;        [self presentViewController:c animated:YES completion:nil];    }else if (2 == buttonIndex){        ControllerC *b = [[ControllerC alloc] init];        c.delegate = self;        [self presentViewController:c animated:YES completion:nil];    }}

cancelButtonTitle destructiveButtonTitle是系统自动的两项。

sheet也可以加到keyWindow中，防止遮挡

[sheet showInView:[UIApplication sharedApplication].keyWindow];