NSSet! 出错
按视频写
override func touchesEnded(touches: NSSet!, withEvent event: UIEvent)
会出错，但换成下面这样就能通过
override func touchesEnded(touches: Set<NSObject>, withEvent event: UIEvent)
是语言版本变了吗？
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按视频写
override func touchesEnded(touches: NSSet!, withEvent event: UIEvent)
会出错，但换成下面这样就能通过
override func touchesEnded(touches: Set<NSObject>, withEvent event: UIEvent)
是语言版本变了吗？
2015-04-23
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