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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性能和调试
｜
339
讨论
观察点是一种断点，用于“观察”内存中的某个地址，当该地址所存储的值发生改
变时，应用程序会暂停执行。
记住，如果退出了程序并重新执行，我们所观察的变量的地址将发生改变，需要重
新添加观察点。
11.7
记录日志
问题
我们想记录应用程序的动作，将这些信息输出到控制台。
解决方案
我们可以用重载
NSLog
函数以显示额外的信息。将下面的函数加到任意
Swift
文件
中。不要放到类定义中，因为这个函数是全局函数，所以我们应该将它放到所有类
的外面：
func Log(message: String,
file: String = __FILE__,
line : Int = __LINE__,
function: String = __FUNCTION__) {
NSLog("\(function) (\(file.lastPathComponent):\(line)): \(message)")
}
现在，当我们调用
Log
函数时，调试控制台将显示出类名和该行代码所在的方法名，
以及文件名和日志打印语句所在的行号。这句代码：
Log("Yes")
将在控制台中输出：
currentCard (CardSlot.swift:31):Hello
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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.
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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.