Facebook Asynchronous Layout and Rending

by 吴雪莹

dispatch_async(backgroundQueue, ^{	storyNode = [[FBStoryNode alloc] initWithStory:story];	[storyNode layoutWithin:CGSizeMake(320,FLT_MAX)];});

- (void)display {	dispatch_async(backgroundQueue, ^{		CGContextRef ctx = newContextOfSize(self.bounds.size);		[self.node drawInContext:ctx];		dispatch_async(main, ^{			self.contents = ctx;		});	});}