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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334
｜
第
11
章
1.
打开断点导航窗口，点击左下方的
+
号按钮（见图
11-4
）。
图
11
-
4
：断点菜单
2.
点击
Add Exception Breakpoint
。
3.
运行程序，当异常抛出时，
Xcode
会在你的代码中停下。
修复内存压力问题
有各种降低内存占用的办法，请参考本章
11.3
节。
11.5
使用纹理压缩
问题
我们想通过纹理压缩来节省内存，减少加载时间。
解决方案
要使用纹理压缩，我们必须先制作出经过压缩的纹理图片。
Xcode
提供了一个纹理
压缩工具，但这个工具用起来有点复杂。比较好的做法是写一个简单脚本，让脚本
为我们处理好这个压缩工具具体调用细节：
1.
创建一个新的空文件，叫作
compress.sh
。将这个文件放到任何你喜欢的地方。
性能和调试
｜
335
2.
在这个文件中编写如下内容（注意这里的文件路径可能会由于页面控制的原因
导致换行，实际输入的时候必须写在同一行）：
PARAMS="-e PVRTC --channel-weighting-perceptual --bits-per-pixel-4"
/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/
Developer/usr/bin/texturetool ...
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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.