selector

问题 I want to define a selector in CBPeripheralDelegate, which is func peripheral(peripheral: CBPeripheral, didUpdateValueForCharacteristic characteristic: CBCharacteristic, error: NSError?) . In swift3, it is renamed to peripheral(_: didUpdateValueFor:error) , and it is same as the func peripheral(peripheral: CBPeripheral, didUpdateValueForDescriptor descriptor: CBDescriptor, error: NSError?) So when I try to define a selector like this #selector(CBPeripheralDelegate.peripheral(_

问题 So, I have code that looks like this: <span class="comic_menu mid_menu_title"> <ul> <li class="level-0 page_item page-item-264"><a href="http://www.domain.com.php5-15.dfw1-1.websitetestlink.com/wordpress/?page_id=264" title="Ca$h Rulez">Ca$h Rulez</a> <ul class='children'> <li class="level-1 page_item page-item-266"><a href="http://www.domain.com.php5-15.dfw1-1.websitetestlink.com/wordpress/?page_id=266" title="1994">1994</a></li> <li class="level-1 page_item page-item-268"><a href="http:/

问题 I have problems using the insert() function of the d3 visualization library. Better to say I do not understand how to use the "before selector". I red the examples here and here, but this dod not help. I create an svg element and append an element to it. Then I append foreignObject-element to the group and would like afterward insert an rectangle before the foreignObject-element. Here is my code var body = d3.select("body"); var svg = body.append("svg") .attr("width", '100%') .attr("height",

问题 Will message selectors work with receiveNowait() method too for synchronous process. it works with receive() method but wanted to know for receiveNoWait for IBM mq. Message selector is added while creating consumer. EDIT 1: I have tested with receiveNowait() method, and the selector is not working. I don't know the problem is with my selector or the receivenowait method. following is the selector I have used: String messageSelector = "JMSTimestamp <= " + System.currentTimeMillis() - 180000;

问题 In this tutorial for sheet programming in cocoa, I am told to invoke the following method: [[alert beginSheetModalForWindow:[searchField window] modalDelegate:self didEndSelector:@selector(alertDidEnd:returnCode:contextInfo:) contextInfo:nil]; I have written this as follows in ruby, alert.beginSheetModalForWindow(self.window, modalDelegate:self, didEndSelector: :alertDidEnd, contextInfo:nil) Of course, the didEndSelector part is wrong. Later in my code I have a method alertDidEnd, which takes

问题 I wish to insert hooks whenever a method is called in my iOS app. So lets say there is a selector X, I wish to log "Method X starting" before the method executes, and then log "Method X ended" after the execution. I am aware of an approach where I can swizzle the implementation of sel X with the one which has the hook before and after the call to "itself", so that I can be notified when the method has executed. But, this will only work if i know the method in advance. I wish to insert hooks

问题 This question already has answers here : Can I combine :nth-child() or :nth-of-type() with an arbitrary selector? (6 answers) Closed 3 years ago . I have a problem with create css (sass) selector, which select last element with class in list ( WITHOUT JAVASCRIPT ): <ul> <li class="post pinned">1</li> <li class="post pinned">2</li> <li class="post">3</li> <li class="post">4</li> </ul> Need to select last post with pinned class (i.e. 2). fiddle 回答1: Problem: In fact :last-child don't work

问题 I am using jquery trying to retrieve the value of a text input but it is not working. can anyone see what I am doing wrong? http://jsfiddle.net/silvajeff/4Sb8K/3/ <table id="oustandingItems"> <tr><th>Category</th></tr> <tr><td><input name="mytest" /></td></tr> <tr><td><input name="mytest" value="123"/></td></tr> <tr><td><input name="mytest" /></td></tr> <tr><td><input name="mytest" /></td></tr> </table> <button id="findRow">Find Row</button> <input type="text" id="myRow" /> $("#findRow")

问题 I created a counter that count different numbers each, but when I choose all the elemnts in class it doesnt work... $(document).ready(function() { function change() { /* $(".test").each(function(i,domeElement){ var theNum = parseInt(this.html())+1; this.html(theNum); }); */ //this works... the other one doesnt why?!?! var theNum = parseInt($(".test").html()) + 1; $(".test").html(theNum); } setInterval(change, 1000); }); http://jsfiddle.net/DTyY7/ 回答1: You should use $(this).html(theNum); and

问题 I have working code: [self performSelector:@selector(doSomething) ]; but when I change this line to: [self performSelector:@selector(doSomething) withObject:nil afterDelay:1.0]; it reports error - unrecognized selector.... could you tell me what is the problem in? thank you 回答1: If you changed your method to take an object parameter then you need to change the @selector() argument to include the ":", e.g., @selector( doSomething: ) This works: - (void) foo { NSLog(@"foo!"); } - (void