问canOpenUrl失败，但openUrl成功

EN

<key>LSApplicationQueriesSchemes</key>
    <array>
        <array>
            <string>OpenLinkMyData</string>
        </array>
    </array>

 - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
    { dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_BACKGROUND, 0) , ^{

            // build the url, using the scheme name, and the data
            // note that json is escaped from bad url chars.
            NSString * MyJsonDataWellEscaped = [[SomeClass getJSonDataToExport]   stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
            NSURL * url = [NSURL URLWithString:[NSString stringWithFormat:@"OpenLinkMyData://%@",MyJsonDataWellEscaped]];

            // Next line should allow test if the app able to manage that scheme is installed.
            // BUT in our case, this allways returning false.
            bool can = [[UIApplication sharedApplication] canOpenURL:url];
            NSLog(@"canOpenUrl = %@", can?@"true":@"false");
         });
// code of the app that do stuff...
}

 - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
    {    dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_BACKGROUND, 0) , ^{
            // build the url, using the scheme name, and the data
            // not that json is escaped from bad url chars.
            NSString * MyJsonDataWellEscaped = [[Move2MyMHelper getJSonDataToExport]   stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
            NSURL * url = [NSURL URLWithString:[NSString stringWithFormat:@"OpenLinkMyData://%@",MyJsonDataWellEscaped]];

            if([[UIApplication sharedApplication] openURL:url])
                {
                NSLog(@"App launched OK");
                }
            else
                {
                NSLog(@"App not launched");
                }

        });

       // code of the app that do stuff...
}

-(BOOL)application:(UIApplication *)application openURL:(NSURL *)url sourceApplication:(NSString *)sourceApplication annotation:(id)annotation {
     NSString *prefixToRemove = @"OpenLinkMyData://";
    if(url != nil && [[url absoluteString] hasPrefix:prefixToRemove])
        {
         NSString * urlStr = [url absoluteString];
         NSString * json = [urlStr substringFromIndex:[prefixToRemove length]];
         json = [json stringByRemovingPercentEncoding];
         NSLog(@"OpenLinkMyData with json  : %@", json);
          }  
    return YES;
}