iphone - UIActionSheet - 类未实现 'UIActionSheetDelegate' 协议(protocol)

Question

我正在尝试使用日期选择器来理解 UiActionSheet。

收到 2 个我似乎无法清除的警告，请参阅代码部分末尾的代码。

警告:语义问题:将“DeveloperTL *”发送到不兼容类型“id”的参数

和

警告:语义问题:将“DeveloperTL *”发送到不兼容类型“id”的参数

有什么想法可以解决这些警告吗？

我从其他几个示例复制的代码:

    define kPickerTag 200
    define SelectButtonIndex 1
    define CancelButtonIndex 2
    NSString *strPrintDate;


    - (void)actionSheet:(UIActionSheet *)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex {
        if (buttonIndex != [actionSheet cancelButtonIndex]) {

            //set Date formatter
            NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
            [formatter setDateFormat:@"MM/dd/YYYY h:mm a"];

            //Gets our picker
            UIDatePicker *ourDatePicker = (UIDatePicker *) [actionSheet viewWithTag:kPickerTag];

            NSDate *selectedDate = [ourDatePicker date];

            NSString *msg = [[NSString alloc] initWithFormat:@"The date that you had selected was, %@", [formatter stringFromDate:selectedDate]];
            [formatter release];

            UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Date" message:msg delegate:nil cancelButtonTitle:@"Dismiss" otherButtonTitles:nil];
            [alert show];
            [alert release];
            [msg release];
        }
    }




    -(void)willPresentActionSheet:(UIActionSheet *)actionSheet {

        UIDatePicker *pickerView = [[UIDatePicker alloc] initWithFrame:CGRectMake(0, 50, 100, 116)];

        [pickerView setTag:kPickerTag];

        [pickerView setDatePickerMode:UIDatePickerModeDate];

        if( strPrintDate != @"" && strPrintDate != nil )
        {
            NSDateFormatter *dateFormat = [[NSDateFormatter alloc] init];
            [dateFormat setDateFormat:@"MMM-dd-yyyy"];

            NSDate *pickerdate = [dateFormat dateFromString:strPrintDate];
            [pickerView setDate:pickerdate animated:YES];
            [dateFormat release];
        }

        [actionSheet addSubview:pickerView];

        [pickerView release];

        NSArray *subViews = [actionSheet subviews];

        [[subViews objectAtIndex: SelectButtonIndex] setFrame:CGRectMake(20, 266, 280, 46)]; 
        [[subViews objectAtIndex:CancelButtonIndex] setFrame:CGRectMake(20, 317, 280, 46)];

    }


    - (IBAction)butn1 {



        UIActionSheet *asheet = [[UIActionSheet alloc] 
                                 initWithTitle:@"Pick the date you want to see." delegate:self cancelButtonTitle:@"Cancel" destructiveButtonTitle:nil otherButtonTitles:@"Select", nil];

// THIS IS THE ERROR MESSAGE:
// **warning: Semantic Issue: Sending 'DeveloperTL *' to parameter of incompatible type // 'id<UIActionSheetDelegate>'**


        [asheet showInView:[self.view superview]]; 

        [asheet setFrame:CGRectMake(0, 117, 320, 383)];
        [asheet release];

    }

Answer 1

您正在使用UIActionSheet的类，需要使用UIActionSheetDelegate协议(protocol)进行确认

在您的 .h 类中按如下方式使用。

@interface myClass: UIView <UIActionSheetDelegate>
{

}
@end