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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使用外设
｜
313
我们还可以让牌墩删掉放到它上面的牌。如果要这样做，从
IB
中选中一个牌墩，
打开属性面板，将
Delete On Drop
属性设置为
On
。
讨论
在游戏画面中，将对象拖放的位置限制某个范围内，将增强游戏的用户体验。如果
游戏中的东西能够拖放到任意地方，这样给人的感觉是太随意了。如果游戏加强控
制并让一切井井有条，那么整件事情看起来就会好得多。
在这个示例中，拖放效果得到了加强，例如当拖放开始时，我们让牌微微转动；当
拖放结束或取消时，牌又转回原来的角度。类似的细节处理将明显改善游戏的体验。
CardSlot
类前面使用了
@IBDesignable
关键字。这样
Xcode
就会将有
@IBInspectable
标记的类中以
@IBDesignable
修饰的属性显示到属性面板中。
注意，如果我们想让一个属性在属性面板中显示，我们需要显式地指明该属
性的类型。例如，我们不能这样声明属性：
//
属性是
Bool
类型，但无法在属性面板中显示
@IBInspectable var someProperty = true
我们必须这样声明属性：
//
显式指明属性的类型，这样才会在属性面板中显示该属性
@IBInspectable var someProperty : Bool = true
10.7
用
UIFeedbackGenerator
实现触觉回馈
问题
你想在某些型号的
iPhone
上通过触觉引擎为玩家提供触觉回馈。
解决方案
要创建力反馈效果，可以使用
UIImpactFeedbackGenerator ...
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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.