January 2020
Intermediate to advanced
356 pages
6h 4m
Chinese
Content preview from Swift游戏开发经典实例
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override func motionBegan(_ motion: UIEvent.EventSubtype, with event: UIEvent?) {
//
摇晃开始，显示一个
Label
self.shakingLabel.isHidden = false
}
override func motionEnded(_ motion: UIEvent.EventSubtype, with event: UIEvent?) {
//
摇晃结束后一秒，隐藏
Label
let delayInSeconds : Double = 1.0
DispatchQueue.main.asyncAfter(deadline: DispatchTime.now() + delayInSeconds) {
self.shakingLabel.isHidden = true
}
}
override var canBecomeFirstResponder: Bool {
return true
}
讨论
视图和视图控制器能够识别摇晃手势。如果需要视图控制器识别摇晃手势，我们首
先需要告诉系统，某个视图控制器能够成为“
first responder
”，也就是说，它能够
接收类似摇晃这样的动作手势。
当摇晃开始，视图控制器就会立即收到
motionBegan(_, with:)
消息。当摇晃结束，
又会收到
motionEnded(_, with:)
消息。
在这个例子中，我们仅仅是在摇晃开始时显示一个 ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.