isKindOfClass, isMemberOfClass

isKindOfClass与isMemberOfClass的区别

isMemberOfClass

• 调用者必须是传入的类的实例对象才返回YES
• 判断调用者是否是传入对象的实例，别弄反了，如 [ins isMemberOfClass:cls] ，意思是ins是否是cls的实例对象
• 不进行父类递归去查找判断

+ (BOOL)isMemberOfClass:(Class)cls {
    return object_getClass((id)self) == cls;
}
- (BOOL)isMemberOfClass:(Class)cls {
    return [self class] == cls;
}

isKindOfClass

• 调用者是传入的类的实例对象，或者调用者是传入类的继承者链中的类的实例对象，则返回YES
• 判断调用者是否是传入对象的子类，别弄反了
• 去父类递归查找判断

+ (BOOL)isKindOfClass:(Class)cls {
    for (Class tcls = object_getClass((id)self); tcls; tcls = tcls->super_class) {
        if(tcls == cls) return YES;
    }
    return NO;
}
-（BOOL)isKindOfClass:(Class)cls {
    for(Class tcls = [self class]; tcls; tcls = tcls->super_class) {
        if(tcls == cls) return YES;
    }
    return NO;
}