selector

问题 How does one call an @selector method with multiple arguments? I have the following [self performSelector:@selector(changeImage:withString:) withObject:A1 withObject:fileString2 afterDelay:0.1]; but get an unrecognized selector sent to instance error My method I am calling is as follows -(void) changeImage: (UIButton *) button withString: (NSString *) string { [button setImage:[UIImage imageNamed:string] forState:UIControlStateNormal]; } 回答1: You should use NSInvocation NSInvocation

问题 I have a Linear layout with 3 text views. I want to change the text view's font color when any of the text view is selected. I would like to retain the new color until another text view is selected. Basically this linear layout should mimic check box's selection behavior. I would like to use the selector to change the color of the text view's font color. I used the below selector on text view's textColor and this only changes the font color as long as the text view is pressed android

问题 I'm new to the Objective C business (Java developer most of the time) and am woking on my first killer app now. :-) At the moment I am somehow confused about the usage of selectors as method arguments. They seem to be a little bit different than delegates in C# for example. Given the following method signature -(void)execute:(SEL)callback; is there a way to enforce the signature for the selector passed to such a method? The method is expecting a selector of a method with the following

问题 I've been using have_selector with RSpec (version 2.0.1) successfully. I recently found documentation on have_tag ... with_tag ... associated with RSpec 1.3.2 and would like to use it, but RSpec gives me the error: undefined method `has_tag?' for #<ActionController::TestResponse:0x105584e80> on the following lines: response.should have_tag("div.breadcrumbs select") do with_tag(:option, :value => @brands.name) with_tag(:option, :value => @marketsize.name) end I've tried the same syntax

问题 I want to create a method and use a string value "redColor" to set the UIColor for a label. tableColorName is the NSString "redColor" and I tried to apply a selector to create the UIColor and apply it to my textLabel. Thanks -(void) changeLabelColor { SEL labelColor = NSSelectorFromString([NSString stringWithFormat:[@"%@", tableColorName]]); UIColor *color = [[UIColor class] performSelector:labelColor]; self.textLabel.textColor = color; } 回答1: Use this method -(UIColor *

问题 I'm trying to select a single word, then apply something to it. Example as below. <p>Some text here</p> Is there a way to select the word text , then apply something to it? For example .css() - I know you can select the whole text, then select word number 2, but that's not what I'm trying to do. The word could be many places. 回答1: Find <p> and children, filter their contents and search for a textual nodeType: var word = 'text'; var rgx = new RegExp('\\b('+word+')\\b', 'ig'); $('p, p *')

问题 I'm trying to get a selector of the dataTask(with:completionHandler:) method defined in URLSession which uses URLRequest object like below, but getting error as there are two methods with slightly two different params names (overloaded methods - 1. one uses URLRequest object as param and another uses URL) : let dataTaskSelector = #selector(URLSession.dataTask(with: completionHandler:)) I have tried a different approach like below (mentioned in https://github.com/apple/swift-evolution/blob

问题 To loop over the results of querySelectorAll in JavaScript, is one of the following more preferable than the other? [].forEach.call(document.querySelectorAll('div'){ // do something }) [].map.call(document.querySelectorAll('div'){ // do something }) Essentially, I'm wondering if these each achieve the same result of providing access to each dom element returned from querySelectorAll . If so, what are reasons one might want to use one over the other? 回答1: forEach operates on the original array

问题 Does anyone have opinions about or experience with Python Selector? It looks great, but I'm a bit put off by its "Alpha" status on pypi and lack of unit tests. I mostly like that its simple, self contained, and pure WSGI. All other url routers I've found assume I'm using django, or pylons, or paste, or pull in lots of other dependencies, or just don't let me create a simple mapping of url patterns to wsgi apps. Really, all I want to do is: mapper.add("/regex/{to}/{resource}", my_wsgi_app)

问题 Does anyone have opinions about or experience with Python Selector? It looks great, but I'm a bit put off by its "Alpha" status on pypi and lack of unit tests. I mostly like that its simple, self contained, and pure WSGI. All other url routers I've found assume I'm using django, or pylons, or paste, or pull in lots of other dependencies, or just don't let me create a simple mapping of url patterns to wsgi apps. Really, all I want to do is: mapper.add("/regex/{to}/{resource}", my_wsgi_app)