selector

问题 In the past I had no problem creating a UIButton programmatically, but ever since I've been using Xcode 9 and Swift 4, I cannot find a way to make this error go away. //Adding target to UIButton func PositionStartButton(xOffset: Float){ StartButton.frame = CGRect(x: Int(0 - 40 + xOffset), y: 0, width: 80, height: 80) StartButton.setImage(#imageLiteral(resourceName: "Logo_Final_WHITE_Face"), for: .normal) StartButton.addTarget(self, action: "pressButton:", for: .touchUpInside) ScrollView

问题 I've trouble with my code: i've written simple SocketChannel client with Selector, after starting it successfully reads messages from server (server sends events). But after writing to socket (see main method) selector starts returning readable socket in infinyty loop, handleKey returns that -1 bytes readed, so selector all time returns OP_READ SelectionKey without data for reading. Sorry for my English. Thanks. import java.io.BufferedReader; import java.io.IOException; import java.io

问题 I'm creating a view programatically, and adding a function so the action responds to the UIControlEvents.TouchUpInside event: button.addTarget(self, action: action, forControlEvents: UIControlEvents.TouchUpInside) So, by going into the documentation I've added this action as a selector: #selector(ViewController.onRegularClick) XCode then complaints about: Argument of #selector refers to a method that is not exposed to Objective-C So I have to set up the handler function with: @objc func

问题 I can't figure out how to coax JQuery in to selecting an element (not binding handlers) that is dynamically inserted in to the DOM after the page loads. For example: If I have HTML: <div id="bar"> World! </div> Then I create a new element and insert it in to DOM: var foo = '<div id="foo">Hello</div>'; $("#bar").before(foo); I end up with this: <div id="foo">Hello</div> <div id="bar"> World! </div> Later on I might want to do something different with the element I inserted, using JQuery to

问题 I'm trying to add in my app the possibility to dismiss the keyboard when the user taps somewhere else out of the text fields. I'm implementing this functionality using UITapGestureRecognizer. I create a new UITapGestureRecognizer object using the Unrecognized selector with UITapGestureRecognizer(target: Any?, action: Selector?) and set the action parameter to a function that resigns the first responder of both the text fields I'm using in this view. I set everything properly adding the

问题 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

问题 The snippet below is a part of a much larger structure with many .step elements. I need to match all .stepText elements that are next to .stepTitleAndImages ul.standard In other words, match all .stepText elements that have .step parent that has .stepTitleAndImages child that has .stepImages.standard child <div class="step"> <div class="stepTitleAndImages"> <h3 class="stepTitle"></h3> <ul class="stepImages standard"></ul> <div class="clearer"></div> </div> <div class="stepText "></div> **HOW

问题 Why does the following two code snippets give different outputs? The only difference between them is that the h1 tag in the first case is replaced with an h tag in the second case. Is this because the h1 tag has a special "meaning" in html? I tried with h1 through h6 and all of them give [] as output, while with h7 it starts to give [u'xxx'] as output. from scrapy import Selector # scrapy version: 1.2.2 text = '<h1><p>xxx</p></h1>' print Selector(text=text).xpath('//h1/p/text()').extract()

问题 I am using the following selector to change the appearance of text in a listView item: <selector xmlns:android="http://schemas.android.com/apk/res/android"> <item android:state_checked="true" android:color="#FFFFFFFF" /> <!-- checked --> <item android:state_activated="true" android:color="#FFFFFFFF" /> <!-- activated --> <item android:state_pressed="true" android:color="#FFFFFFFF" /> <!-- pressed --> <item android:state_focused="true" android:color="#FFFFFFFF" /> <!-- focused --> <item

问题 I'm trying to do an asynchronous request with ASIHTTPRequest, but have some problem getting notified when the request is done. -(void)doDownload{ NSURL *url = [NSURL URLWithString:@"http://www.someurl.com/?"]; ASIFormDataRequest *request = [ASIFormDataRequest requestWithURL:url]; [request setPostValue:@"someValue" forKey:@"someField"]; [request setRequestMethod:@"POST"]; [request setDelegate:self]; [request setDidFinishSelector:@selector(requestFinished)]; [request startAsynchronous]; } -