January 2020
Intermediate to advanced
356 pages
6h 4m
Chinese
Content preview from Swift游戏开发经典实例
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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.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.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.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.
输入
｜
121
3.17
将设备当作方向盘
问题
你可能想让用户把设备当作方向盘用，在玩家驾驶的过程中不断获得数据。
解决方案
无论玩家驾驶多长时间，我们都可以获得想要的数据。你需要指定某个坐标轴作为
方向盘的“转向轴”，这样，
Core Motion
框架就能够沿这个轴计算出转动的方向。
大部分情况下，跟驾驶有关的游戏都采用了横屏模式。要确保游戏只运行在横屏模
式，需要在项目导航窗口中选中顶部的项目文件，然后在右边的
Info
窗口中找到
Device Orientation
栏，确保只有
Landscape Left
和
Landscape Right
两项选上。
然后，在项目中导入
Core Motion
框架
（参考问题
3.9
）。最后，添加一个
CMMotionManager
，然后用下列代码监听设备的运动通知：
motionManager.startDeviceMotionUpdates(to: OperationQueue.main) {
(motion, error) -> Void in
//
确保有一个
CMDeviceMotion
可用
guard let motion = motion else {
if let error = error {
print("Error: \(error)")
}
return
}
//
最大转向角度，向左为
-50
度，
//
向右为
50
度
let maximumSteerAngle = 50.0
//
在横屏中，
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
and much more.
Read now
Unlock full access
More than 5,000 organizations count on O’Reilly
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.