Objective C的方法和语法 [英] Objective C Methods and syntax

问题描述

我用Objective-C的工作时感到有点困惑。这部分特别混淆了我很多。

I am a bit confused when working with objective-c. This part in particular confuses me a lot.

什么是写作code这样的...

What is the purpose and/ or difference between writing code like this ...

object = [object method];

和

[object method];

学习Objective-C到现在为止，我一直认为我可以做这样的事情。

Learning objective-c up until now, I always assumed that I could do something like this..

说，我已经创造了这个..

say I had already created this..

NSString *object = [[NSString alloc]initWithFormat:@"%@"];

然后我可以做我想做的与像这样..

then I could do what I want with that like so..

[object applyAnyMethodHere];

但现在我看到这样的事情。

but now I'm seeing things like this ..

object = [object applyAnyMethodHere];

什么是这两者之间的区别？

What is the difference between these two?

推荐答案

第一个（对象= [对象的方法]; ）的任何方法返回的分配。

The first one (object = [object method];) is an assignment of whatever method returns.

第二个（ [对象的方法]; ）。只是调用该方法，而不注重其返回值（如果有的话）

The second one ([object method];) is just calling the method without paying attention to its return value (if any).

第三（的NSString *对象= [[NSString的页头] initWithFormat：@@] ）声明变量并分配 initWithFormat 呼吁页头的方法的返回值类方法。

The third (NSString *object = [[NSString alloc]initWithFormat:@"@"]) declares variable and assigns the return value of the initWithFormat method called on the return value of the alloc class method.

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