摘要: It is a simple way to test that a methods parameter is not nil or not 0. So basically, you use it to create a precondition, stating that some parameter must be set. If it is not set, the macro causes the application to abort and generates an error on that line. So:- (void)someMethod:(id)someObjectTh 阅读全文
posted @ 2013-05-08 22:46 cateatmycode 阅读(421) 评论(0) 推荐(0)