如何在Objective-C中从字符串实例化类的对象? [英] how to instantiate an object of class from string in Objective-C?

问题描述

我有一个字符串，其值是必须实例化的Class [MyClass]的名称，而MyClass具有一个称为

I've a String who's value is the name of the Class[MyClass] which has to be instantiated, and MyClass has a method called

 -(void)FunctionInClass;

我正在使用称为NSClassFromString的方法来实例化MyClass.我想知道

i'm using the method called NSClassFromString to instantiate MyClass.I want to know

1) what does NSClassFromString return?? 
2) what is id? 
3) How to call method -(void)FunctioninClass which is in MyClass using the instance.

我应该如何继续进行操作，我要在iPhone应用程序的Objective-C中执行该操作吗?

how should i proceed , i'm doing it in Objective-C for iPhone app?

推荐答案

1) what does NSClassFromString return??

它返回一个Class，这意味着您可以执行[[NSClassFromString(@"MyClass") alloc] init]; 参见 Mac开发人员中心文档以获取更多信息.

It returns a Class, which means you can do [[NSClassFromString(@"MyClass") alloc] init]; see Mac Dev Center Docs for more info.

2) what is id?

请参见 http://www.otierney.net/objective-c.html#idtype

3) How to call method -(void)FunctioninClass which is in MyClass using the instance.

id myclass = [[NSClassFromString(@"MyClass") alloc] init];
[myclass FunctioninClass];

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