如何测试Objective-C中的对象属于哪个类? [英] How do I test which class an object is in Objective-C?

问题描述

如何测试对象是否是Objective-C中特定类的实例?假设我要查看对象a是类b还是类c的实例，我该如何去做呢?

How do I test whether an object is an instance of a particular class in Objective-C? Let's say I want to see if object a is an instance of class b, or class c, how do I go about doing it?

推荐答案

测试对象是否是a类的实例:

To test if object is an instance of class a:

[yourObject isKindOfClass:[a class]]
// Returns a Boolean value that indicates whether the receiver is an instance of 
// given class or an instance of any class that inherits from that class.

或

[yourObject isMemberOfClass:[a class]]
// Returns a Boolean value that indicates whether the receiver is an instance of a 
// given class.

要获取对象的类名，可以使用NSStringFromClass函数:

To get object's class name you can use NSStringFromClass function:

NSString *className = NSStringFromClass([yourObject class]);

或Objective-C运行时api中的C函数:

or c-function from objective-c runtime api:

#import <objc/runtime.h>

/* ... */

const char* className = class_getName([yourObject class]);
NSLog(@"yourObject is a: %s", className);

编辑:在Swift中

if touch.view is UIPickerView {
    // touch.view is of type UIPickerView
}

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