selector

问题 I am doing an exercise to learn how to use selectors in Objective-C. In this code I am trying to compare two strings: int main (int argc, const char * argv[]) { @autoreleasepool { SEL selector= @selector(caseInsensitiveCompare:); NSString* str1=@"hello"; NSString* str2=@"hello"; id result=[str1 performSelector: selector withObject: str2]; NSLog(@"%d",[result boolValue]); } return 0; } But it prints zero.Why? Edit: And if I change str2 to @"hell" I get an EXC_BAD_ACCESS. 回答1: The documentation

问题 I'm trying to add a selector to my expandable listview I have a background, text color and and image that I need to change state when the item is selected here's my layout for the group item <?xml version="1.0" encoding="utf-8"?> <com.example.views.CheckedRelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="48dp" android:background="@color/selector_menu_item_bg" android:minHeight="48dp" android:orientation=

问题 When i call the PFcloud function from normal it return the correct count how ever when i call it with selector, the selector call back function is not fired, Appreciate if any can can point to me what is the mistake in my code. Working block - it print out the count successfully PFCloud.callFunctionInBackground(CloudFunctions.getBookingCount, withParameters: ["camp": "pmAwLDTNc6"], block: { (result: AnyObject!, error: NSError!) -> Void in if ( error === nil) { NSLog("Booking Count call back:

问题 Well I got the most basic question. I want to select the iframe within the div. And when this iframe is clicked no matter where, I want to remove the iframe. How can I do this? <div id="box"> Random thoughts <iframe src=""></iframe> </div> See here: http://jsfiddle.net/nT4uZ/1/ 回答1: You cannot directly handle the click inside of an iframe as correctly @Daedalus commented. You need top put an extra div inside the #box div which it will cover the iframe and it will handle the click above the

问题 I create a simple WatchApp Metronome. I use NSTimer with .scheduledTimerWithTimeInterval, and I have an error Extra Argument 'selector' in call Thanks for your answers func playBeat() { if(self.State == true) { self.State == false [labelPlayPause.setTitle("Pause")] } else { self.State == true [labelPlayPause.setTitle("Play")] } BPMValue = 10 var BPMInt:Int = Int(BPMValue) let value = "\(BPMInt) BPM" labelBPM.setText(value) let aSelector: Selector = "playBeat" dispatch_async(dispatch_get_main

问题 Given an svg with an existing id="kvg:StrokeNumbers_07425" , <g id="kvg:StrokeNumbers_07425" style="font-size:8;fill:blue;">...</g> I do the following : d3.select("#kvg:StrokeNumbers_07425").attr("style","fill:red;"); and get the following error message : Uncaught SyntaxError: Failed to execute 'querySelector' on 'Document': '#kvg:StrokeNumbers_07425' is not a valid selector. It's likely due to the : . What should I do to make it work? EDIT: http://jsfiddle.net/0v7jjpdd/1/ 回答1: Escape the :

问题 Quick question, is a jQuery child selector without a parent ever valid? If so, how would you use it? Example of the jQuery child selector: $('ul > li') Example of jQuery child selector without parent: $('> li') The second example above doesn't work. However I can't remember if I saw it in the past before or I've seen something advance like: $('ul').not('>li') Doesn't really work either (but doesn't pop up an error message, so it's just ignored?) So my question is would you EVER use a child

问题 I use JQuery for my web application. I don't know how to write a selector for this situation. <a class="abc def xyz-delete-confirm efg">text</a> <a class="abc def delete-confirm">text</a> I need to find all links that has a class ending with "-delete-confirm" or has a class called "delete-confirm". I know how to handle the situation of having a class called "delete-confirm". How about the "-delete-confirm situation"? Can I have a single selector covering two situations? Thanks for any input!

问题 I use jQuery.translate, very normal code as: $('body').translate(... Now I do not want the textarea and input:text get translated, so I tried: $('*:not(textarea,:text)').translate(.. $('body *:not(textarea, input:text)').translate( None working. (these answers got from another question: jQuery, Select Body but exclude Textarea and Input:Text, how? Anyone here, has an idea how to translate the body but exclude textarea and input:text, thanks. 回答1: From the jQuery.translate wiki; first add the

问题 Is there a way to send a parameter to the selector via a NSTimer ? myTimer =[NSTimer scheduledTimerWithTimeInterval:1 target:self selector:@selector(removeTheNote:) userInfo:nil repeats:NO]; - (void)removeTheNote:(NSString*)note { NSLog(@"Note %@ ----------- REMOVED!",note); } I know that using : myTimer =[NSTimer scheduledTimerWithTimeInterval:1 target:self selector:@selector(removeTheNote:myNote) userInfo:nil repeats:NO]; doesn't work, so I am asking, is there a way to do this? 回答1: You can