selector

问题 I've searched for solutions to this problem but couldn't find anything that seems to address it in my case. I'm getting the above exception from a UITapGestureRecognizer. Here's the simplified code: import UIKit; class ViewController : UIViewController, UIScrollViewDelegate { @IBOutlet weak var scrollView:UIScrollView!; var imageView:UIImageView!; override func viewDidLoad() { super.viewDidLoad(); ... set up imageView/scrollView here ... let doubleTapRecognizer = UITapGestureRecognizer(target

问题 Is it possible to pass an int variable via a selector, e.g. #selector(run(1)) or #selector(run(2)) More context if necessary: let button = UIBarButtonItem(title: "Run", style: UIBarButtonItemStyle.Plain, target: self, action: #selector(run(1))) 回答1: After confirming to some iOS Developers, no you can't do this yet. But there is an alternative. You can receive the sender object in the action method. You can add any property to the sender class. And receive that in action method. for example:

问题 Is it possible to pass an int variable via a selector, e.g. #selector(run(1)) or #selector(run(2)) More context if necessary: let button = UIBarButtonItem(title: "Run", style: UIBarButtonItemStyle.Plain, target: self, action: #selector(run(1))) 回答1: After confirming to some iOS Developers, no you can't do this yet. But there is an alternative. You can receive the sender object in the action method. You can add any property to the sender class. And receive that in action method. for example:

问题 I have three view controllers, all with two buttons each on the right and left sides of the navigation bar, as seen below on one of them. I'm creating these buttons programatically, and instead of writing the code in each respective view controller (VC) I decided to write a Helper class that creates the buttons. // Note: I am using FontAwesome as a third-party library. class Helper: NSObject { static func loadNavBarItems(vc: UIViewController) { let profileButton = UIBarButtonItem() let

问题 I know that ID is a faster selector than class in Javascript. But what if I cache the selector? When the selector is cached, would it differ in speed if it’s a class selector, or will it be as fast as the id selector? Example: <div class=”myclass”></div> <div id=”myid”></div> var $myclass = $('.myclass'); var $myid = $('#myid'); Will $myid be faster than than $myclass? 回答1: You have those stored in variables. So the speed will be the same for both. The performance hit will occur when you are

问题 I want to pass an int value from my selector method, but the selector method takes only an object type parameter. int y =0; [self performselector:@selector(tabledata:) withObject:y afterDelay:0.1]; Method execution is here -(int)tabledata:(int)cellnumber { NSLog(@"cellnumber: %@",cellnumber); idLabel.text = [NSString stringWithFormat:@"Order Id: %@",[[records objectAtIndex:cellnumber] objectAtIndex:0]]; } but I am not getting exact integer value in my method, I am only getting the id value.

问题 I'm trying to build a dynamic jquery selector with the following code: var section_id = "{segment_3}"; var num_children = $('#'+ section_id + ' ul').children().size(); where segment_3 is a value I successfully retrieve from the url string, which, for example, might return the value of "section_one" But when trying to create the variable num_children, this reference doesn't work. How do I construct the code to build a dynamic reference? Thanks for any help. 回答1: Assuming var section_id =

问题 I feel like this is kind of a silly question, but here I go anyways. I have an image button, and I want to be able to change it's image everytime it is clicked. The API seems to say that the best way to go about doing this is to create xml resource in the drawable folder that contains a selector and values. However when I go to make a new android xml resource, there's no option for drawables. What am I missing? 回答1: As far as I know, the Android XML editor doesn't allow you to create XML

问题 here is my button object let loginRegisterButton:UIButton = { let button = UIButton(type: .system) button.backgroundColor = UIColor(r: 50 , g: 80, b: 130) button.setTitle("Register", for: .normal) button.translatesAutoresizingMaskIntoConstraints = false button.setTitleColor(.white, for: .normal) button.addTarget(self, action:#selector(handleRegister), for: .touchUpInside) return button }() and here is my function func handleRegister(){ FIRAuth.auth()?.createUser(withEmail: email, password:

问题 I am trying to access an ejb that is exposed in jbossAS7.1 from code running in an embedded jetty server: final Properties jndiProperties = new Properties(); jndiProperties.put(Context.INITIAL_CONTEXT_FACTORY, "org.jboss.naming.remote.client.InitialContextFactory"); jndiProperties.put(Context.PROVIDER_URL, "remote://127.0.0.1:4447"); jndiProperties.put("jboss.naming.client.ejb.context", true); jndiProperties.put("jboss.naming.client.connect.options.org.xnio.Options.SASL_POLICY_NOPLAINTEXT",