public static NSObject observeAuthenticationDidChange(
GKLocalPlayer object, final VoidBlock1<GKLocalPlayer> block) {
return NSNotificationCenter.getDefaultCenter()
.addObserver(
AuthenticationDidChangeNotification(),
object,
NSOperationQueue.getMainQueue(),
new VoidBlock1<NSNotification>() {
@Override
public void invoke(NSNotification a) {
block.invoke((GKLocalPlayer) a.getObject());
}
});
}
/** @since Available in iOS 8.0 and later. */
public static NSObject observeFailedToDecode(
AVSampleBufferDisplayLayer object,
final VoidBlock2<AVSampleBufferDisplayLayer, NSError> block) {
return NSNotificationCenter.getDefaultCenter()
.addObserver(
FailedToDecodeNotification(),
object,
NSOperationQueue.getMainQueue(),
new VoidBlock1<NSNotification>() {
@Override
public void invoke(NSNotification a) {
NSDictionary<?, ?> data = a.getUserInfo();
NSError error = null;
if (data.containsKey(FailedToDecodeNotificationErrorKey())) {
error = (NSError) data.get(FailedToDecodeNotificationErrorKey());
}
block.invoke((AVSampleBufferDisplayLayer) a.getObject(), error);
}
});
}