如何在Objective-C中动态实例化一个类

Can I know how to dynamically instantiate a class in Objective-C?

我可以知道如何在Objective-C中动态实例化一个类吗？

2 个解决方案

#1

MyClass *myClass = [[MyClass alloc] init];
OtherClass *otherClass = [[OtherClass alloc] init];

#2

On the iPhone, if you want to create an instance of a class given the class name you can use the runtime function objc_lookUpClass.

在iPhone上，如果要创建给定类名的类的实例，可以使用运行时函数objc_lookUpClass。

For example, if I have a base class BaseHandler and want to instantiate an object of the right subclass at runtime (hard coded as MyHandler in this example):

例如，如果我有一个基类BaseHandler并且想要在运行时实例化一个右子类的对象（在本例中硬编码为MyHandler）：

#import <objc/objc.h>
[...]
NSString *handlerClassName = @"MyHandler"
id handlerClass = objc_lookUpClass([handlerClassName 
            cStringUsingEncoding:[NSString defaultCStringEncoding]]);
BaseHandler *handler = (BaseHandler *) [[handlerClass alloc] init];

#1

MyClass *myClass = [[MyClass alloc] init];
OtherClass *otherClass = [[OtherClass alloc] init];

#2