iOS 给父类发送消息

<pre>

@interface NSObject (QMUI)

/**
对 super 发送消息

@param aSelector 要发送的消息
@return 消息执行后的结果
@link http://stackoverflow.com/questions/14635024/using-objc-msgsendsuper-to-invoke-a-class-method
*/

• (id)performSelectorToSuperclass:(SEL)aSelector;

/**
对 super 发送消息

@param aSelector 要发送的消息
@param object 作为参数传过去
@return 消息执行后的结果
@link http://stackoverflow.com/questions/14635024/using-objc-msgsendsuper-to-invoke-a-class-method
*/

• (id)performSelectorToSuperclass:(SEL)aSelector withObject:(id)object;

/**
遍历某个 protocol 里的所有方法

@param protocol 要遍历的 protocol，例如 @protocol(xxx)
@param block 遍历过程中调用的 block
*/

• (void)enumerateProtocolMethods:(Protocol *)protocol usingBlock:(void (^)(SEL selector))block;
  @end
  </pre>

<pre>
@implementation NSObject (QMUI)

• (id)performSelectorToSuperclass:(SEL)aSelector {
  struct objc_super mySuper;
  mySuper.receiver = self;
  mySuper.super_class = class_getSuperclass(object_getClass(self));

  id (*objc_superAllocTyped)(struct objc_super *, SEL) = (void )&objc_msgSendSuper;
  return (objc_superAllocTyped)(&mySuper, aSelector);
  }

• (id)performSelectorToSuperclass:(SEL)aSelector withObject:(id)object {
  struct objc_super mySuper;
  mySuper.receiver = self;
  mySuper.super_class = class_getSuperclass(object_getClass(self));

  id (*objc_superAllocTyped)(struct objc_super *, SEL, ...) = (void )&objc_msgSendSuper;
  return (objc_superAllocTyped)(&mySuper, aSelector, object);
  }

• (void)enumerateProtocolMethods:(Protocol *)protocol usingBlock:(void (^)(SEL))block {
  unsigned int methodCount = 0;
  struct objc_method_description *methods = protocol_copyMethodDescriptionList(protocol, NO, YES, &methodCount);
  for (int i = 0; i < methodCount; i++) {
  struct objc_method_description methodDescription = methods[i];
  if (block) {
  block(methodDescription.name);
  }
  }
  free(methods);
  }

@end
</pre>