iOS - 如何创建“实用程序”？所有控制器都可以调用的类 [英] iOS - how do I create a "utility" class that all my controllers can call

问题描述

我是iOS和obective-c的新手，所以我不太清楚如何最好地完成这个看似简单的任务。

I am new to iOS and obective-c so I am not too sure how to best accomplish this seemingly simple task.

我想要的是上课在伪代码中看起来像这样：

What I want is to make a class that looks like this in pseudocode:

class UtilityClass
{
    // Have a method that I can pass parameters to 
    String doCalculation ( String art1 , String arg2 )
    {
        return arg1 + arg2;
    }
}

我的不确定性是：

1）xCode似乎倾向于以相对平坦的方式布置我的文件结构。那么我应该创建一个utils目录并将此文件放在utils / fileName下吗？通常我习惯于至少拥有一些src目录，但到目前为止我没有被任何东西提示创建一个。
2）如何从我的控制器导入并调用此类/函数？

1) xCode seems to be inclined to lay out my file structure in a relatively flat way. So should I make a utils directory and have this file be under utils/fileName ? Usually I am kind of used to having at least some src directory, but so far I have not been prompted by anything to create one. 2) How do I import and call this class/function from my controllers?

谢谢，
Alex

Thanks, Alex

推荐答案

只需创建一个名为Utilities的新组，然后在其中创建您的类。比如，

Just create a new group called Utilities, and then create your class inside it. Like,

utils.h 
utils.m

稍后在ViewController的头文件中添加。

Later in your ViewController's header file just add.

#import "utils.h"

如果这个utils类被非常胖的项目中的许多控制器使用的话，找到一个名为的文件，应该在支持文件组内。

if this utils class is used by many controllers in very fat project then, find a file called, Should be inside supporting files group.

YourAppName-Prefix.pch

在该文件中，您有一个这样的代码块，

In that file you have a code block like this,

#ifdef __OBJC__
    #import <UIKit/UIKit.h>
    #import <Foundation/Foundation.h>
    #import <CoreData/CoreData.h>
#endif

只需编辑此块并添加 utils。 h 这里引用，这样整个项目就可以创建utils对象而无需显式导入到自己的头文件中。

Just edit this block and add your utils.h reference here, In this way your entire project can create utils object without explicitly importing into their own header.

像这样编辑。，

#ifdef __OBJC__
    #import <UIKit/UIKit.h>
    #import <Foundation/Foundation.h>
    #import <CoreData/CoreData.h>
    #import "utils.h"
#endif

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