源码分析：
+ (BOOL)isMemberOfClass:(Class)cls {
return object_getClass((id)self) == cls;
}
- (BOOL)isMemberOfClass:(Class)cls {
return [self class] == cls;
}
+ (BOOL)isKindOfClass:(Class)cls {
// 获取的是该类的meta class
for (Class tcls = object_getClass((id)self); tcls; tcls = tcls->superclass) {
if (tcls == cls) return YES;
}
return NO;
}
- (BOOL)isKindOfClass:(Class)cls {
for (Class tcls = [self class]; tcls; tcls = tcls->superclass) {
if (tcls == cls) return YES;
}
return NO;
}
class和meta class关系
总结：
+ (BOOL)isMemberOfClass:是判断该类的meta class是否和class相等。- (BOOL)isMemberOfClass:判断该对象所属的类是和class相等，即用于判断一个对象是否属于当前这个类。+ (BOOL)isKindOfClass:循环遍历该类的meta class的super class，判断是否和class相等（只有NSObject的meta class的super class等于NSObject）。- (BOOL)isKindOfClass:循环遍历该对象所属的类及super class，判断是否和class相等，即用于判断当前对象是否属于这个类或者这个类的子类；。
