// - (BOOL)conformsToProtocol:(Protocol *)aProtocol;
[student conformsToProtocol:@protocol(MyProtocol)];
// 或者使用类方法
// + (BOOL)conformsToProtocol:(Protocol *)protocol;
[Student conformsToProtocol:@protocol(MyProtocol)];
4. 判断student的test1方法是否响应(即:是否声明并实现了test1方法)
// - (BOOL)respondsToSelector:(SEL)aSelector;
[student respondsToSelector:@selector(test1)];
5. 间接调用student的test1方法(test1无参数)
// - (id)performSelector:(SEL)aSelector;
[student performSelector:@selector(test1)];
6. 间接调用student的test2方法(test2有一个参数)
// - (id)performSelector:(SEL)aSelector withObject:(id)object;
[student performSelector:@selector(test2:) withObject:@"123"];
// 最多带两个参数
//- (id)performSelector:(SEL)aSelector withObject:(id)object1 withObject:(id)object2;
7. 延迟2s调用student的test1方法
(在命令行没有延迟效果,因为命令行执行完后就退出main函数了 ,在IOS部分main函数一直在执行,所以可以看到延迟效果)
// - (void)performSelector:(SEL)aSelector withObject:(id)anArgument afterDelay:(NSTimeInterval)delay;
// delay单位为(秒)
[student performSelector:@selector(test2:) withObject:@"123" afterDelay:2];