selector

Selector的详细介绍 class scrapy.selector.Selector(response = None,text = None,type = None) selector 是对 response 的封装，用来对选取其中的特定内容。 下面是 Selector 的主要成员变量： response 一个HtmlResponse或者XmlResponse对象 text 一个unicode字符串或者utf-8文本，当response为空的时候才有效。同时使用text和response是未定义行为 type 定义selector的类型，可以是html、xml或None(default) 如果type为None，那么selector会根据response自动选择最佳的type，如果定义了text那么默认成html类型 response的类型确定 xml：XmlResponse html：HtmlResponse html：其他类型 如果已经设定了type那么强制使用设定好的type。 主要成员函数： - xpath() 寻找匹配xpath query 的节点，并返回 SelectorList 的一个实例结果，单一化其所有元素。返回的列表元素也实现了 Selector 的接口。query 是包含XPATH查询请求的字符串。 - css() 应用给定的CSS选择器，返回

I have a series of imageviews that I identify using their tag. I have added a single tap gesture to the images. UITapGestureRecognizer *singleTap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(selectImage:)]; [tableGridImage addGestureRecognizer:singleTap]; tableGridImage.userInteractionEnabled = YES; [singleTap release]; This manages to call the selectImage selector ok, but passes the gesture as the sender. I need the imageview as the sender so I can get the tag. Any ideas on how I can get the imageview and it's tag? I figured out how to get the tag, which was the most

For the method: [NSThread detachNewThreadSelector:@selector(method:) toTarget:self withObject:(id)SELECTOR]; How do I pass in a @selector? I tried casting it to (id) to make it compile, but it crashes in runtime. More specifically, I have a method like this: +(void)method1:(SEL)selector{ [NSThread detachNewThreadSelector:@selector(method2:) toTarget:self withObject:selector]; } It crashes. How do I pass in the selector without crashing, so that the new thread can call the selector when the thread is ready? The problem here isn't passing a selector to a method, per se, but passing a selector

I have a method with multiple variables: -(void) showImg:(UIBarButtonItem *)sender string1:(NSString *) string2:(NSString *); I want to send NSString values (As this function is used for multiple elements). This is how I add my action when no parameters are needed: [myButton addTarget:self action:@selector(showImg) forControlEvents: UIControlEventTouchUpInside]; I tried adding parameters within the @selector like this: [myButton performSelector @selector(showImg:string1:string2::) withObject:@"-1" withObject:@"-1"]; But this does not work. How may I call my function with multiple parameters

Is something like this possible? .imgbox:hover{ .ui-resizable-se { /*some style */ } } Or a conceptual equivalent? Basically, only when an element of a certain class is hovered over, then some element within that class should change some style. You can do this: .imgbox:hover .ui-resizable-se { /*some style */ } The same can be generated by LESS or SASS. Sure that would be : .imgbox:hover .ui-resizable-se { /*some style */ } No, CSS does not allow nesting. You'd have to write it like this: .imgbox:hover .ui-resizable-se { /*some style */ } However, there are various CSS preprocessors available

I'm writing a NIO server and would like to response on a user request, i.e. write some data to a channel. Selector selector; //... if(selector.selectNow() != 0){ if(key.isReadable()){ SocketChannel channel = key.channel(); //read some data //respond key.interestOps(SelectionKey.OP_WRITE) //How to add the key to a selected set? } } After reading some data I want to respond. It means I need to add OP_WRITE to the key and then add the key to Selected-keys set and then write some content to a channel once the key appeared in a selected-set. How to add the key to a selected set explicitly? You can

I'm threeaing some tasks like this : RootViewController - (void)viewDidLoad { [NSThread detachNewThreadSelector:@selector(findSomething) toTarget:self withObject:nil]; } - (void) findSomething { NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init]; doMoreThings [pool release]; } - (void) doMoreThings { doMoreMoreMoreThings on different objects } - (void) foundSomething:(NSFoundThing*)foundObj { do your stuff } oneObject - (void) doMoreMoreMoreThings { do things [self performSelectorOnMainThread:@selector(foundSomething:) withObject:thingFound waitUntilDone:NO]; } gives -[KMLParser