Objective-c 中的“测试类平等”

Objective-C是一种面向对象的编程语言，它在iOS和macOS开发中被广泛使用。在Objective-C中，我们可以使用“测试类平等”来判断两个对象是否相等。在本文中，我们将探讨什么是“测试类平等”，以及如何在Objective-C中使用它。

objective-c
#import 
@interface Person : NSObject
@property (nonatomic, strong) NSString *name;
@property (nonatomic, assign) NSInteger age;
@end
@implementation Person
- (BOOL)isEqual:(id)object {
    if (self == object) {
        return YES;
    }
    if (![object isKindOfClass:[Person class]]) {
        return NO;
    }
    Person *otherPerson = (Person *)object;
    return [self.name isEqualToString:otherPerson.name] && self.age == otherPerson.age;
}
- (NSUInteger)hash {
    NSUInteger prime = 31;
    NSUInteger result = 1;
    result = prime * result + [self.name hash];
    result = prime * result + self.age;
    return result;
}
@end
int main(int argc, const char * argv[]) {
    @autoreleasepool {
        Person *person1 = [[Person alloc] init];
        person1.name = @"Alice";
        person1.age = 25;
        
        Person *person2 = [[Person alloc] init];
        person2.name = @"Bob";
        person2.age = 30;
        
        Person *person3 = [[Person alloc] init];
        person3.name = @"Alice";
        person3.age = 25;
        
        BOOL isEqual = [person1 isEqual:person2];
        NSLog(@"person1 isEqual to person2: %@", isEqual ? @"YES" : @"NO");
        
        isEqual = [person1 isEqual:person3];
        NSLog(@"person1 isEqual to person3: %@", isEqual ? @"YES" : @"NO");
    }
    return 0;
}