OC基础 - isMemberOfClass | isKindOfClass
2024-10-21 11:56:06
isMemberOfClass | isKindOfClass
1 - 猜想以下代码输出的结果
1 #import <Foundation/Foundation.h>
2 #import <objc/runtime.h>
3 @interface Person : NSObject
4
5 @end
6 @implementation Person
7
8 @end
9
10 int main(int argc, const char * argv[]) {
11 @autoreleasepool {
12
13 NSLog(@"%d", [[NSObject class] isKindOfClass:[NSObject class]]);
14 NSLog(@"%d", [[NSObject class] isMemberOfClass:[NSObject class]]);
15 NSLog(@"%d", [[Person class] isKindOfClass:[Person class]]);
16 NSLog(@"%d", [[Person class] isMemberOfClass:[Person class]]);
17
18 NSLog(@"========== 以上代码等价如下 =========");
19
20 NSLog(@"%d", [NSObject isKindOfClass:[NSObject class]]);
21 NSLog(@"%d", [NSObject isMemberOfClass:[NSObject class]]);
22 NSLog(@"%d", [Person isKindOfClass:[Person class]]);
23 NSLog(@"%d", [Person isMemberOfClass:[Person class]]);
24
25 }
26 return 0;
27 }
日志信息
2 - isMemberOfClass 和 isKindOfClass 源代码
1 - (BOOL)isMemberOfClass:(Class)cls {
2 return [self class] == cls;
3 }
4 - (BOOL)isKindOfClass:(Class)cls {
5 for (Class tcls = [self class]; tcls; tcls = tcls->superclass) {
6 if (tcls == cls) return YES;
7 }
8 return NO;
9 }
10
11
12 + (BOOL)isMemberOfClass:(Class)cls {
13 return object_getClass((id)self) == cls;
14 }
15
16
17 + (BOOL)isKindOfClass:(Class)cls {
18 for (Class tcls = object_getClass((id)self); tcls; tcls = tcls->superclass) {
19 if (tcls == cls) return YES;
20 }
21 return NO;
22 }
结论：isMemberOfClass 左边对象（类对象）是否等于右边所传进的类对象，是相等的关系
isKindOfClass 左边对象（类对象）是否等于右边所传进的类对象或是其子对象，是相等或是其子对象的关系
3 - 代码实例
1 #import <Foundation/Foundation.h>
2 #import <objc/runtime.h>
3 @interface Person : NSObject
4
5 @end
6 @implementation Person
7
8 @end
9
10 int main(int argc, const char * argv[]) {
11 @autoreleasepool {
12
13 // ----------------------------类方法
14 NSLog(@"%d", [Person isMemberOfClass:object_getClass([Person class])]); // 1
15
16 // NSObject
17 NSLog(@"%d", [Person isKindOfClass:object_getClass([NSObject class])]); // 1
18 NSLog(@"%d", [Person isKindOfClass:[NSObject class]]);// 1
19
20 // ----------------------------实例方法
21 id person = [[Person alloc] init];
22
23 NSLog(@"%d", [person isMemberOfClass:[Person class]]); // 1
24 NSLog(@"%d", [person isMemberOfClass:[NSObject class]]); // 0
25 NSLog(@"%d", [person isKindOfClass:[Person class]]); // 1
26 NSLog(@"%d", [person isKindOfClass:[NSObject class]]); // 1
27
28 }
29 return 0;
30 }
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