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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327
第 11 章
性能和调试
在开发过程中，几乎每个游戏都会出现性能问题，几乎每个游戏都出现过崩溃。幸
运的是，
iOS
中有一些非常好的工具，能够对游戏进行最大的性能优化并找出程序
中的
Bug
和问题。
在本章，我们将学习如何使用这些工具，如何修复问题，如何获得游戏运行中的信息。
11.1
改善帧刷新率
问题
我们希望改善游戏的帧刷新率，使游戏流畅运行。
解决方案
要改善帧刷新率，首先需要查看性能问题主要是出自哪里。在
Xcode
中：
1.
从
Scheme
菜单中，选定你的设备，也就是当你点击编译运行后程序将会安装
到的那台设备。
2.
打开
Product
菜单，选择
Profile
（或者按
Command+I
）。程序将开始编译并安
装到设备上，同时
Instruments
会打开，让你选择一个
Instruments
运行模板（见
图
11-1
）。
3.
选择
Time Profiler
模板，然后点击
Choose
，你将看到
Instruments
主界面打开（见
图
11-2
）。点 击
Run
开始运行游戏
,
你会看到游戏运行的
CPU
时间等相关信息。
328
｜
第
11
章
4.
点击屏幕底部的
Call Tree
按钮，勾选
Invert Call Tree
、
Hide Missing Symbols
，
以及
Hide System Libraries
三个选项，再将其他选项取消，如图 ...
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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.