从其他类访问方法Objective-C [英] Accessing Method from other Classes Objective-C

问题描述

寻找这个问题的答案，但我还没有找到合适的答案。我希望你们（和gals）可以帮助我！ （这是一个iPhone应用程序）

Looked for an answer for this question, but I haven't found a suitable one yet. I'm hoping you guys (and gals) can help me out! (This is for an iPhone app)

好吧，我有一个Mutliview应用程序。每个视图都有自己的类，一切都很开心。然而，不同的类有时调用相同的方法。到目前为止，我已经在两个类文件中简单地写了这个方法两次。

Alright, I have a Mutliview application. Each view has it's own class, and everything is happy. However, the different classes sometimes call the same method. Up until now, I have simply wrote that Method twice, in both of the class files.

这是我想要做的：

我想创建一个新类，在它自己的文件，有所有的通用方法。然后，当另一个类需要调用方法时，我只需从其他文件调用它。这样，当我想更改方法时，我只需要在一个地方更改它，而不是所有的地方...

I want to make a new class, in It's own file, that has all the "Common" Methods. Then, whenever another class needs to call the Method, I simply call it from the other file. This way, when I want to change the Method, I only need to change it in one place, and not all the places...

我不知道我会这样做，这就是为什么我要求帮助。我对于Objective-C有点生锈和新，所以漂亮的例子会帮助我很多。请允许我给你一个。

I'm not sure how I'd do this, which is why I'm asking for help. I'm a little rusty and new for Objective-C, so pretty examples will help me a lot. Allow me to give you one.

文件：ViewController1.m

File: ViewController1.m

@implementation ViewController1

//Do Some awesome stuff....

CALL "CommonMethod" HERE

@end

档案：ViewController2.m

File: ViewController2.m

@implementation ViewController2

//Do Some awesome stuff....

CALL "CommonMethod" HERE

@end

档案：CommonClass

File: CommonClass

@implementation commonClass

- (void)CommonMethod:(id)sender
{

//So some awesome generic stuff...



    }
@end

感觉像我需要#import其他文件，从类中创建一个对象，并从对象调用方法...我如何做？

I feel like I need to #import the other file, make an Object from the class and call the Method from the Object... How do I do that?

再次感谢

推荐答案

选项1：

@implementation commonClass
+ (void)CommonMethod:(id)sender  /* note the + sign */
{
//So some awesome generic stuff...
    }
@end

@implementation ViewController2

- (void)do_something... {
    [commonClass CommonMethod];
}


@end

：

@implementation commonClass
- (void)CommonMethod:(id)sender
{
//So some awesome generic stuff...
    }
@end

@implementation ViewController2

- (void)do_something... {
    commonClass *c=[[commonClass alloc] init];
    [c CommonMethod];
    [c release];
}

@end

选项3：使用继承

@implementation commonClass
- (void)CommonMethod:(id)sender
{
//So some awesome generic stuff...
    }
@end

/* in your .h file */
@interface ViewController2: commonClass

@end

自然你总是需要 #import commonClass.h 。

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