核心是类模型
1 isEqual
内部实现比较指针是否相等
if (self == other) return YES;
if (!self || !other) return NO;
2 performSelector
((id(*)(id, SEL))objc_msgSend)((id)self, sel);
3 isMemberOfClass
- (BOOL)isMemberOfClass:(Class)cls {
return [self class] == cls;
}
4
- (BOOL)isKindOfClass:(Class)cls {
for (Class tcls = object_getClass((id)self); tcls; tcls = tcls->superclass) {
if (tcls == cls) return YES;
}
return NO;
}
5 - (BOOL)isSubclassOfClass:(Class)cls {
for (Class tcls = self; tcls; tcls = tcls->superclass) {
if (tcls == cls) return YES;
}
return NO;
}
6 - (BOOL)conformsToProtocol:(Protocol *)protocol {
if (!protocol) return NO;
for (Class tcls = self; tcls; tcls = tcls->superclass) {
if (class_conformsToProtocol(tcls, protocol)) return YES;
}
return NO;
}
7 这里验证了类模型的争取性 - (BOOL)respondsToSelector:(SEL)sel {
if (!sel) return NO;
return class_respondsToSelector_inst(object_getClass(self), sel, self);
}
- (BOOL)respondsToSelector:(SEL)sel {
if (!sel) return NO;
return class_respondsToSelector_inst([self class], sel, self);
}
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