iPhone SDK @selector - ＆gt; SEL @protocol - ＆gt;？

Question

好吧所以我想创建一个公共函数，如果对象存在，将返回YES，符合协议并响应选择器。我知道@selector的typedef是SEL，但是@protocol

的typedef是什么

BOOL conforms(id object, ? prototype, SEL action) {
  return (object != nil && 
         [object conformsToProtocol:prototype] && 
         [object respondsToSelector:action]);
}

我希望能够像以下一样调用此函数：

if(conforms(delegate, @protocol(UIScrollViewDelegate), 
   @selector(touchesBegan:withEvent:))) {
  [delegate touchesBegan:touches withEvent:event];
}

Answer 1

您正在寻找Protocol对象：

BOOL conforms(id object, Protocol *protocol, SEL action) {
  return (object != nil && 
         [object conformsToProtocol:protocol] && 
         [object respondsToSelector:action]);
}