objective-c - 如何测试对象在 Objective-C 中属于哪个类？

Question

如何在 Objective-C 中测试一个对象是否是特定类的实例？假设我想看看对象a是b类还是c类的实例，我该怎么做呢？

Answer 1

测试对象是否是a类的实例:

[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，您可以使用 NSStringFromClass 函数:

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

或来自 Objective-c 运行时 api 的 c 函数:

#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
}