NSObject常用方法

  • - (BOOL)isKindOfClass:(Class)aClass //判断是否为aClass或者aClass的子类的实例,aClass可以通过[类名 class]获取
  • - (BOOL)isMemberOfClass:(Class)aClass //判断是否为aClass的实例(不包括aClass的子类)
  • - (BOOL)conformsToProtocol:(Protocol)aProtocol //判断对象是否实现了aProtocol协议
  • + (BOOL)instancesRespondToSelector:(SEL)aSelector //判断这个类的对象是否拥有参数提供的方法aSelector
  • - (BOOL)respondsToSelector:(SEL)aSelector //判断对象是否拥有参数提供的方法aSelector
  • - (void)performSelector:(SEL)aSelector withObject:(id)anArgument afterDelay:(NSTimeInterval)delay //延迟调用参数提供的方法,方法所需参数用withObject传入

反射

  •  Class的反射

  通过类名的字符串形式实例化对象

    Class class = NSClassFromString(@"Student");

    Student *stu = [[class alloc] init];

     将类名变成字符串

    Class class = [Student class];

    NSString *className = NSStringFromClass(class);

 

  •  SEL的反射

    通过方法的字符串形式实例化方法

    SEL selector = NSSelectorFromString(@"setName:");

    [stu performSelector:selector withObject:@"Mike"];

  将方法变成字符串

    NSStringFromSelector(@selector(setName:));

 posted on 2014-11-29 11:41  子叶_Sky  阅读(297)  评论(0编辑  收藏  举报