IOS/Objective-C：UIActivityItemSource 协议，用于自定义与 UIActivityViewController 的共享消息

Question

Apple 文档说您可以使用 UIActivityItemSource 协议来自定义与 UIActivityViewController 共享的消息，以代替 UIActivityItemProvider 对象：

UIActivityItemSource

You can use this protocol in situations where you want to provide the data from one of your app’s existing objects instead of creating a separate UIActivityItemProvider object.

我已经采用了这个协议，但是，如下所示的委托方法似乎没有触发。任何人都可以确认这应该有效，如果是这样，请指出我可能缺少的东西？提前感谢您的任何建议。

-(NSString *)activityViewController:(UIActivityViewController *)activityViewController subjectForActivityType:(UIActivityType)activityType
{
    NSLog(@"DELEGATE METHOD CALLED");//Not logging to console 

    if (activityType == UIActivityTypeMessage) {
        return @"My message";
    } else if (activityType == UIActivityTypeMail) {
        return @"My email text";
    }
else {
    return @"My default text";
}
}

Answer 1

是的，这个委托方法对我有用，调用了委托方法。我使用以下代码创建 activity 项目控制器：

NSArray *theItems = @[ self ];
UIActivityViewController *theController = [[UIActivityViewController alloc] initWithActivityItems:theItems applicationActivities:nil];

theController.popoverPresentationController.barButtonItem = self.shareButton;
theController.excludedActivityTypes = @[ UIActivityTypeAssignToContact,
    UIActivityTypeSaveToCameraRoll, UIActivityTypePostToFlickr,
    UIActivityTypePostToVimeo, UIActivityTypeAirDrop ];
[self presentViewController:theController animated:YES completion:NULL];

其中 self 实现 UIActivityItemSource.

IOS/Objective-C：UIActivityItemSource 协议，用于自定义与 UIActivityViewController 的共享消息

IOS/Objective-C: UIActivityItemSource Protocol for customizing share messages with UIActivityViewController

objective-c

ios

uiactivityitemprovider