iOS 8共享扩展loadItemForTypeIdentifier:options:completionHandler:完成关闭未执行

Question

我在NSItemProvider对象上使用loadItemForTypeIdentifier:options:completionHandler:方法,通过iOS 8中的Share扩展从Safari中提取url.

在Objective-C中,此代码和工作以及块运行.

[itemProvider loadItemForTypeIdentifier:(@"public.url" options:nil completionHandler:^(NSURL *url, NSError *error) {
    //My code
}];

在Swift中,它看起来非常相似,但是关闭不会运行.此外, itemProvider.hasItemConformingToTypeIdentifier("public.url")返回YES所以必须有一个有效的对象来解析内部的URL itemProvider.

itemProvider.loadItemForTypeIdentifier("public.url", options: nil, completionHandler: { (urlItem, error) in
    //My code
})

Info.plist NSExtension部分与Objective-C和Swift版本完全相同,如下所示:

<key>NSExtension</key>
<dict>
    <key>NSExtensionAttributes</key>
    <dict>
        <key>NSExtensionActivationRule</key>
        <dict>
            <key>NSExtensionActivationSupportsWebURLWithMaxCount</key>
            <integer>1</integer>
        </dict>
        <key>NSExtensionPointName</key>
        <string>com.apple.share-services</string>
        <key>NSExtensionPointVersion</key>
        <string>1.0</string>
    </dict>
    <key>NSExtensionPointIdentifier</key>
    <string>com.apple.share-services</string>
    <key>NSExtensionMainStoryboard</key>
    <string>MainInterface</string>
</dict>

我究竟做错了什么？

Answer 1

呼叫

self.extensionContext!.completeRequestReturningItems([], completionHandler: nil) 

在completionHandler结束时,而不是在didSelectPost()结束时调用它

Answer 2

由于必须在调用所有completionHandler之后调用completeRequestReturningItems,因此以下是我的工作.

 let group = dispatch_group_create()

    for item: AnyObject in self.extensionContext!.inputItems {
        let inputItem = item as! NSExtensionItem
        for provider: AnyObject in inputItem.attachments! {
            let itemProvider = provider as! NSItemProvider
            if itemProvider.hasItemConformingToTypeIdentifier("public.url") {
                dispatch_group_enter(group)
                itemProvider.loadItemForTypeIdentifier("public.url", options: nil, completionHandler: {
                    (result: NSSecureCoding!, error: NSError!) -> Void in
                    //...
                    dispatch_group_leave(group)
                });
            }
            if itemProvider.hasItemConformingToTypeIdentifier(kUTTypeImage as String) {
                dispatch_group_enter(group)
                itemProvider.loadItemForTypeIdentifier(kUTTypeImage as String, options: nil, completionHandler: { (result, error) -> Void in
                    if let resultURL = result as? NSURL {
                        if let image = UIImage(data: NSData(contentsOfURL: resultURL)!) {
                            // ...
                        }
                    }
                    dispatch_group_leave(group)
                });
            }
        }
    }
    dispatch_group_notify(group,dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_HIGH, 0), {
        self.extensionContext!.completeRequestReturningItems([], completionHandler: nil)
    })

Answer 3

我对此没有任何功劳，但看看这个人是如何做到的：https://github.com/oguzbilgener/SendToInstapaper/blob/master/ShareExtension/SendingViewController.swift