客观c动态对象创建 [英] objective c dynamic object creation

问题描述

为您提供快速问题。我想要能够创建一个对象的实例。对象类型基于字符串。

Quick question for you. I want to be able to create an instance of an object. The object type is based of a string.

在php中，你可以用一个字符串替换类名，但我怀疑这在Objective c中很容易。 p>

In php you can just replace the class name with a string, but I doubt it is that easy in Objective c.

NSString * className;
id theObject;
className = @"TestObject";
theObject = [[className alloc] init];

这里是它可能看起来的分解。

here is a break down of what it might look like. I want to try and avoid using a giant case style statement.

可以使用选择器系统吗？

Is it possible to use the selector system for this?

任何想法？

干杯

推荐答案

使用以下obj-c运行时函数之一获取类名（可能需要导入标题：

You can get a class by its name using one of the following obj-c runtime functions (you may need to import header:

id objc_lookUpClass(const char *name)
id objc_getClass(const char *name)

可能看起来像（未测试它）：

So your code may look like (have not tested it though):

NSString * className = @"TestObject";
id theObject = nil;
Class myClass = objc_lookUpClass([className UTF8String]);
if (myClass)
   theObject = [[myClass alloc] init];

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