ios - UIActivityViewController 不共享图像

Question

以下代码旨在根据所选的不同平台共享不同的文本和不同的图像(UIImage 和NSData)。问题是没有图像从 activityImageShare() 传递到 UIActivityViewController。

问题:

What’s could be wrong here exactly?

How can I correct the code below to ensure that activityImageShare() shares the images, and ensure they are picked up as an activityType by UIActivityViewController?

代码:

1 - 四张图片，三张 UIImage 和一张 NSData。

var myImage1: UIImage! 
var myImage2: UIImage!
var myImage3: NSData!
var myImage4: UIImage!

2 - 根据选择的平台定义图像以传递给 UIActivityViewController。

class activityImageShare: NSObject, UIActivityItemSource {
    @objc func activityViewControllerPlaceholderItem(activityViewController: UIActivityViewController) -> AnyObject {
        return ""
    }
    @objc func activityViewController(activityViewController: UIActivityViewController, itemForActivityType activityType: String) -> AnyObject? {
        switch activityType {
        case UIActivityTypePostToFacebook:
            return myImage1
        case UIActivityTypePostToTwitter:
            return myImage2
        case UIActivityTypePostToWeibo:
            return myImage3
        default:
            return myImage4
        }
    }
}

3 - 根据选择的平台定义文本以传递给 UIActivityViewController。

class activityTextShare: NSObject, UIActivityItemSource {
    @objc func activityViewControllerPlaceholderItem(activityViewController: UIActivityViewController) -> AnyObject {
        return ""
    }
    @objc func activityViewController(activityViewController: UIActivityViewController, itemForActivityType activityType: String) -> AnyObject? {
        switch activityType {
        case UIActivityTypePostToFacebook:
            return "This is my text 1."
        case UIActivityTypePostToTwitter:
            return "This is my text 2."
        case UIActivityTypePostToWeibo:
            return "This is my text 3."
        default:
            return "This is my text 4."
        }
    }
}

4 - 根据 activityTextShare() 和 activityImageShare() 中定义的文本和图像呈现 UIActivityViewController。

func myShareActivity() {
    let activity = UIActivityViewController(activityItems: [activityTextShare(), activityImageShare()], applicationActivities: nil)
    self.presentViewController(activity, animated: true, completion: nil)
}

Answer 1

尝试在 activityViewControllerPlaceholderItem(activityViewController: UIActivityViewController) 中返回占位符图像而不是 ""