Question

自iOS 7推出以来，对Objective-C进行了大量改进和更改。我在下面创建了UIActionSheet，并将delegate分配给self，以便我可以按下每个按钮来完成操作。

- (IBAction)sortButton
{
    UIActionSheet *sortSheet = [[UIActionSheet alloc]
                                initWithTitle:@"Sort By"
                                delegate:self
                                cancelButtonTitle:@"Cancel"
                                destructiveButtonTitle:@"Featured"
                                otherButtonTitles:@"Price", @"Brand", nil];

    [sortSheet showInView:self.view];
}

这是我用来检查用户点击UIAlertView中的特定按钮时所做的操作的代码：

- (void)actionSheet:(UIActionSheet *)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex
{
    if(buttonIndex == 0)
    {
        UIAlertView *dueDateAlert = [[UIAlertView alloc]
                                     initWithTitle:@"Featured"
                                     message:@"This button formats the list for items based on Feature."
                                     delegate:nil
                                     cancelButtonTitle:nil
                                     otherButtonTitles:@"Ok", nil];

        [dueDateAlert show];
    }

    else if(buttonIndex == 1)
    {
        UIAlertView *creationDateAlert = [[UIAlertView alloc]
                                          initWithTitle:@"Price"
                                          message:@"This button formats the list for items based on Price."
                                          delegate:nil
                                          cancelButtonTitle:nil
                                          otherButtonTitles:@"Ok", nil];

        [creationDateAlert show];
    }

    else if(buttonIndex == 2)
    {
        UIAlertView *subjectAlert = [[UIAlertView alloc]
                                     initWithTitle:@"Brand"
                                     message:@"This button formats the list for items based on Brand."
                                     delegate:nil
                                     cancelButtonTitle:nil
                                     otherButtonTitles:@"Ok", nil];

        [subjectAlert show];
    }
}

当我运行此代码时，我会在创建Sending SecondViewController *const_strong to parameter of incomplete type 'id<UIActionSheetDelegate>的{{1}}文本中收到以下警告：self。我假设它说我正在做“低效率”的事情，我想知道需要改变什么才能让这个警告不出现。

Answer 1

您的班级似乎未向UIActionSheetDelegate协议确认。

检查您是否有类似

的内容

@interface YourClass () <UIActionSheetDelegate>

UIActionSheet委托自我警告

1 个答案: