What is annotation:(id)annotation in openURL method?

题

In the app delegate, there is this method

- (BOOL)application:(UIApplication *)application openURL:(NSURL *)url sourceApplication:(NSString *)sourceApplication annotation:(id)annotation {

I am wondering what the "annotation" is? Also, how would I use it/view it to see what it contains?

Thanks

解决方案

annotation: A property-list object supplied by the source application to communicate information to the receiving application.

It is what the application that triggered the url opening wants to share with you.

其他提示

It is a dictionary. I have only found it useful for determining the referrer when opening deeplinks from mobile Safari:

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