如何在Objective-C中测试对象是哪个类？

Question

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

Answer 1

要测试object是否是类a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.

要么

[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:

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:在斯威夫特

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

Answer 2

你也可以使用

NSString *className = [[myObject class] description]; 

在任何NSObject上