问题描述
我在iOSU开发的iTunesU课程中观看精彩的Paul Haggerty（因为谁不需要刷新基础知识？）他说了一些我不知道的事情：
I was watching the wonderful Paul Haggerty in the iTunesU courses for iOS development (cause who doesn't need to refresh on the basics?) and he said something that I wasn't aware of:
然后他继续讨论如何使用@property声明变量， @synthesize variable = _variable 是编译器在幕后生成的代码，以及作为二传手和吸气鬼。基本上，代码永远不会出现在您的应用程序中。
He then went on to talk about how when you use @property to declare your variables,@synthesize variable = _variable is code that's generated behind the scenes by the complier, as well as the setter and getter. Essentially that code never should appear in your app.
在我迄今为止编写的所有iOS应用程序中，我总是使用 @property 声明我的变量我的头文件和 @synthesize VARIABLE_NAME = _VARIABLE_NAME; 自从观看讲座以来，我现在很困惑我是否应该使用 @synthesize 在我的代码中。
In all of my iOS apps I've written thus far, I always declare my variables using @property in my header file and @synthesize VARIABLE_NAME = _VARIABLE_NAME; Since watching the lecture, I'm now confused as to if I should be using @synthesize in my code at all.
我应该只使用属性声明吗？如果我在代码中使用合成声明，它会有什么不同呢？
Should I just use the property declaration? What difference does it make, if any, if I use the synthesize declaration in my code?
由于Haggerty先生不使用它，那我为什么呢？ （考虑到他是一个iOS半神）。我非常觉得做我一直在做的事情是不好的。
Since Mr. Haggerty doesn't use it, then why do I? (considering he's sort of an iOS demi-god). I very much feel like it's bad form to do what I've been doing.
有人想澄清这个问题吗？
Anyone care to clarify that issue?
推荐答案
添加默认的属性自动综合（iOS和64位OS X）。在实现部分中，您不需要 @synthesize 指令，以便编译器合成声明属性的访问器。
Xcode 4.0 Developer Preview 4 Release Notes. Adds default automatic synthesis of properties (iOS and 64-bit OS X). You don’t need the @synthesize directive in the implementation sections for the compiler to synthesize accessors for declared properties.
所以
@synthesize ivar = _ivar;
如果省略则完全相同。
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