Objective-C:"@ synthesize fooBar;"与"@synthesize fooBar = _fooBar;" [英] Objective-C: `@synthesize fooBar;` vs. `@synthesize fooBar=_fooBar;`

问题描述

可能重复:
合成属性和带下划线前缀的变量:是什么这是什么意思?

Possible Duplicate:
Synthesized property and variable with underscore prefix: what does this mean?

我已经在代码中看到了这两个；有什么区别?

I've seen both of these in code; what's the difference?

@synthesize fooBar;

@synthesize fooBar=_fooBar;

推荐答案

@synthesize fooBar;使用具有相同名称的实例变量为存储fooBar创建访问器，而=_fooBar告诉编译器使用实例变量名为_fooBar作为存储.如果实例变量和属性的名称相同，则无需使用=....否则，请使用

@synthesize fooBar; creates accessors for the property fooBar using an instance variable with the same name for storage, while the =_fooBar tells the compiler to use the instance variable named _fooBar as storage instead. You don't need to use the =... if you have your instance variables and properties identically named, and you do otherwise.

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