UIAlertController使用

 if(SYSTEM_VERSION >= 8.0)
    {
        UIAlertController * alertCtr = [UIAlertController alertControllerWithTitle:@"" message:@"删除联系人？" preferredStyle:UIAlertControllerStyleAlert];
        UIAlertAction *firstAction = [UIAlertAction actionWithTitle:@"确定" style:UIAlertActionStyleDefault handler:^(UIAlertAction *action) {
            //do something
        }];
        UIAlertAction *secondAction = [UIAlertAction actionWithTitle:@"取消" style:UIAlertActionStyleDefault handler:^(UIAlertAction *action) {
            //do something
        }];
        [alertCtr addAction:firstAction];
        [alertCtr addAction:secondAction];
        [self presentViewController:alertCtr animated:YES completion:^{
            
        }];
    }

2、替代UIActionSheet

 if(SYSTEM_VERSION >= 8.0)
    {
        UIAlertController * alertCtr = [UIAlertController alertControllerWithTitle:nil message:nil preferredStyle:UIAlertControllerStyleActionSheet];
        UIAlertAction *firstAction = [UIAlertAction actionWithTitle:@"回复" style:UIAlertActionStyleDestructive handler:^(UIAlertAction *action) {
            //do something
        }];
        UIAlertAction *secondAction = [UIAlertAction actionWithTitle:@"转发" style:UIAlertActionStyleDefault handler:^(UIAlertAction *action) {
            //do something
        }];
        UIAlertAction *thirdAction = [UIAlertAction actionWithTitle:@"取消" style:UIAlertActionStyleCancel handler:^(UIAlertAction *action) {
            //do something
        }];
        [alertCtr addAction:firstAction];
        [alertCtr addAction:secondAction];
        [alertCtr addAction:thirdAction];
        [self presentViewController:alertCtr animated:YES completion:^{
            
        }];
    }