问题描述
根据 第202页的第206页的Cocoa Programming for Mac OS X：
According to Cocoa Programming for Mac OS X, 3rd Edition, on page 202 (chapter 13):
这是真的最好的做法吗？全局变量？这对我来说似乎很疯狂 - 反对我曾经教过的一切。
Is this really the correct best practice? Global variables? That seems insane to me – counter to everything I’ve ever been taught.
一个更好的设计是一个简单的Singleton类与这些定义？还是真的是去全球的正确的最佳做法？
Would a better design be a simple Singleton class with these defined? Or is it really the correct best practice to go global? Is there a better pattern than either, given that many people consider Singletons to be globals in a pretty dress?
推荐答案
全局变量或全局变量单身人士将在这里完成同样的事情。这两个都可以用来打开Cocoa中的关键名称，如果它拼写错误编译器错误不会引发编译器错误。这是主要目的。
Global variables or a singleton will accomplish the same thing here. Both can be used to turn 'key' names in Cocoa that won't throw a compiler error if it's misspelled into a compiler error. That's the main purpose. Global variables are a bit easier though seeing as it requires less typing.
而不是这样：
[myArray setObject:theObject forKey:MyGlobalVariableKeyName];
您必须按照以下方式执行：
You'd have to do something along the lines of:
[myArray setObject:theObject
forKey:[[MySingletonVariableClass getInstance] myVariableKeyName];
全局变量基本上减少了相同效果的输入。
Global variables are essentially less typing for the same effect.
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