首页 > 代码库 > NSObject常用方法和反射

NSObject常用方法和反射

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:));