isKindOfClass和isMemberOfClass的区别
+ (BOOL)isMemberOfClass:(Class)cls {
// 类的元类 与 传入类 对比
return object_getClass((id)self) == cls;
}
- (BOOL)isMemberOfClass:(Class)cls {
// 对象的类 与 传入类 对比
return [self class] == cls;
}
+ (BOOL)isKindOfClass:(Class)cls {
// 元类 --> 根元类 --> 根类 --> nil 与 传入类的对比
for (Class tcls = object_getClass((id)self); tcls; tcls = tcls->superclass) {
if (tcls == cls) return YES;
}
return NO;
}
- (BOOL)isKindOfClass:(Class)cls {
// 对象的类 --> 父类 --> 根类 --> nil 与 传入类的对比
for (Class tcls = [self class]; tcls; tcls = tcls->superclass) {
if (tcls == cls) return YES;
}
return NO;
}
测试代码：
BOOL re1 = [(id)[NSObject class] isKindOfClass:[NSObject class]];
BOOL re3 = [(id)[KSPerson class] isKindOfClass:[KSPerson class]];
BOOL re2 = [(id)[NSObject class] isMemberOfClass:[NSObject class]];
BOOL re4 = [(id)[KSPerson class] isMemberOfClass:[KSPerson class]];
NSLog(@" \n re1 :%hhd\n re2 :%hhd\n re3 :%hhd\n re4 :%hhd\n",re1,re2,re3,re4);
BOOL re5 = [(id)[NSObject alloc] isKindOfClass:[NSObject class]];
BOOL re7 = [(id)[KSPerson alloc] isKindOfClass:[KSPerson class]];
BOOL re6 = [(id)[NSObject alloc] isMemberOfClass:[NSObject class]];
BOOL re8 = [(id)[KSPerson alloc] isMemberOfClass:[KSPerson class]];
NSLog(@" \n re5 :%hhd\n re6 :%hhd\n re7 :%hhd\n re8 :%hhd\n",re5,re6,re7,re8);
结果：
2021-01-23 17:25:30.138090+0800 test[8101:257311]
re1 :1
re2 :0
re3 :0
re4 :0
2021-01-23 17:25:30.138761+0800 test[8101:257311]
re5 :1
re6 :1
re7 :1
re8 :1
Program ended with exit code: 0
