当我在XCode 4.5中声明属性时，自动生成的ivar会采用什么名称？ [英] What name does the auto-generated ivar take when I just declare a property in XCode 4.5 onwards?

问题描述

早些时候我在Snow Leopard很长一段时间都在XCode 4.2上。
我已经使用XCode 4.5直接跳转到Mountain Lion，使用iOS 6 SDK和ARC。

Earlier I was on XCode 4.2 for a long time on Snow Leopard for a long time. I have made a straight jump to Mountain Lion with XCode 4.5 on with iOS 6 SDK and ARC.

我已经改变了很多。只是想知道，默认变量的命名风格是否已经改变了？

A lot has changed for me. Just wanted to know, whether the naming style of default variables has changed ?

因为在旧的XCode中，如果我不自己声明一个ivar，它将采用与物业。

because in older XCode if I wont declare an ivar myself, it would take the same name as the property.

在4.5中，我宣布了一个属性（不再需要合成！）。

In 4.5, I declared a property (no synthesize required anymore!).

在over over setter，我试图使用变量作为属性的同名，比如说abc。

In the overidden setter, I am trying to use the variable as the same name as the property, say abc.

但是XCode没有认出它并给我建议_abc！

but XCode is not recognizing it and giving me suggestions of _abc !

自动生成的ivar是否以_现在开始？

Does the auto-generated ivar starts with _ now ?

推荐答案

自动生成的 @synthesize 语句使用前缀为下划线的实例变量：

The automatically generated @synthesize statement uses instance variables prepended with an underscore:

@synthesize abc = _abc;

但是没有实例的显式 @synthesize 语句变量

But an explicit @synthesize statement without instance variable

@synthesize abc;

仍相当于

@synthesize abc = abc;

与旧Xcode版本的兼容性。

for compatibility with older Xcode versions.

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