App Extensions 打开 app

App Extensions里不能直接调用openurl的方式去打开app，sdk提供了一种方法:

// Asks the host to open an URL on the extension's behalf
- (void)openURL:(NSURL *)URL completionHandler:(void (^ __nullable)(BOOL success))completionHandler;
           

但是这种方法目前只能适用于today extension（其他的extension暂时不可用）。

通过网上查找资料，目前搜集到两个方法：

第一种，sdk版本要8.3以上（包括8.3，9.2测试还可以用）

// Prepare the URL request
    // this will use the custom url scheme of your app
    // and the paths to the photos you want to share:
    NSString * urlString = [ NSString stringWithFormat: @"%@://%@", APP_SHARE_URL_SCHEME, ( NULL == invokeArgs ? @"" : invokeArgs ) ];
    NSURL * url = [ NSURL URLWithString: urlString ];
 
    NSString *className = @"UIApplication";
    if ( NSClassFromString( className ) )
    {
        id object = [ NSClassFromString( className ) performSelector: @selector( sharedApplication ) ];
        [ object performSelector: @selector( openURL: ) withObject: url ];
    }
           

第二种，sdk版本低于8.3的

// openURL doesn't work for any extension, but the Today one,
        // so we'll use a workaround:
        // 1. Instantiate a UIWebView that's so tiny it won't show on the screen:
        UIWebView * webView = [ [ UIWebView alloc ] initWithFrame: CGRectMake( 0, 0, 0, 0 ) ];
 
        // 2. Prepare the URL request for the UIWebView:
        // this will use the custom url scheme of your app
        // and the paths to the photos you want to share:
        NSString * urlString = [ NSString stringWithFormat: @"%@://%@", APP_SHARE_URL_SCHEME, ( NULL == invokeArgs ? @"" : invokeArgs ) ];
        NSURL * url = [ NSURL URLWithString: urlString ];
        NSURLRequest * request = [ NSURLRequest requestWithURL: url ];
 
        // 3. Now get the UIWebView to load the request, which will launch the app:
        [ webView loadRequest: request ];
        [ self.view addSubview: webView ];
 
        // 4. And finally, say bye to the UIWebView.
        // The delay is important here, otherwise the UIWebView won't have time
        // to invoke your app before it's dismissed:
        [ webView performSelector: @selector( removeFromSuperview ) withObject: NULL afterDelay: 2.0 ];
           

以上主要方法来自http://easynativeextensions.com/how-to-launch-your-app-from-the-ios-8-share-menu/ 这篇文章