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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330
｜
第
11
章
11.2
快速加载关卡
问题
我们想尽可能快地加载每一关，以便用户能够快速进入游戏。
解决方案
要使关卡的加载速度更快，主要有三种技术：
加载更小或者更少的资源
将要加载的声音或图片大小降低。减少纹理图片的大小，压缩图片，使用音质
更差的声音。或者，减少要加载的资源数。
显示进度条
在加载新关卡时，计算一下需要加载的资源数，每加载完成一个资源，将进
度立即显示给用户，可以使用一个进度条来显示（例如一个
UILabel
或者一个
UIProgressView
），也可以使用一个
UITextField
。
流纹理
在加载开始时，加载较小的资源，比如非常小的图片，当游戏开始后，再通过
后台线程加载完全大小的图片；每当一个高清图片加载完，就替换掉一个与之
对应的小图片。
讨论
所有的办法中，有一半的方法是使游戏“看起来变快了”，而另一半方法则是使游
戏“真的变快了”。
加载更小的资源意味着需要传输的数据更小。一个
iOS
设备其实是由一些相互关联
的小的零部件构成的，它需要从闪存芯片将数据传输给
CPU
和
GPU
。几乎在任何
情况下，要想“加载快”就得“加载少”。
如果在某些情况下真的没办法提高加载速度，那至少要显示一个进度条给用户以便
让用户能够看到加载过程。如果你只是在屏幕上显示一个不会动的“
loading
”文本，
玩家会觉得很枯燥，这样玩家会觉得时间变长了。我们可以看一下在游戏以外的例
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