ibaction

问题 I want to show the number of characters left for a new tweet, after a key has been lifted. Currently, this only happens if return is lifted: - (IBAction)updateCharacterCountFromNewTweetField:(id)sender { [newTweetCharacterCount setIntValue:140 - [[sender stringValue] length]]; } This action is connected to an NSTextField (NOT A UITextField!!): This is terrible for users, because they want to see the character count immediately, not just after pressing return. Can anyone help me out? Thanks.

问题 I'm new to Xcode and I assume there's a way to do it but I can't seem to figure it out. I have made a custom control by subclassing UIView and using IBDesignable. However, I can't seem to figure out how to send events from within my control to a IBAction outside of it. 回答1: You need to subclass UIControl not UIView. Once Interface Builder sees an UIControl subclass then send events section and actions will be available. Accessing the Control’s Targets and Actions 来源： https://stackoverflow.com

问题 I'm new to iOS development so please bear with me.. I'm in the process of creating a simple app. There is a facebook button and I'd like that button to send the user to my facebook page, either in the browser or if they have the facebook app open that up. I know there's probably a lot to explain, but if someone could point me in the right direction that would be great, thanks. 回答1: As of the 4.0 update for Facebook, you can jump to pages with this URI schema: fb://page/{fbid} Just make sure

问题 I got a mainscreen with a imported custom actionBar. I created this actionBar in a separate .xib file, with a .m and .h file. I do some graphic setup in my actionBar.m's viewDidLoad like backgroundColor and some other stuff. I also got a button on this actionBar i linked the way i usually link buttons, with a IBAction . I load my actionBar into my mainscreen like this: ActionBarWithLogoff *actionBar = [[ActionBarWithLogoff alloc] initWithNibName:@"ActionBarWithLogoff" bundle:nil]; [topBar

问题 Here is my code: -(IBAction)saveDownloadedImage { NSLog(@"Test"); EXECUTED indicatorView.hidden = NO; NOT EXECUTED [indicatorView startAnimating]; NOT EXECUTED [statusLabel setText:@"WHY?"]; NOT EXECUTED [currentPicture setImage:[imageView image]]; EXECUTED ImageFileManager *fileManager = [[ImageFileManager alloc] init]; EXECUTED [fileManager saveImageToDisk:currentPicture]; EXECUTED indicatorView.hidden = YES; [statusLabel setText:@"Image saved successfully."]; EXECUTED saveButton.enabled =

问题 I have an IBAction of when the button is clicked to change my view. How can I handle multiple clicks for example if I click the button a second time to cause another action? Or do I need to delete the button after it has been clicked and then create a new one in its place? If so how do I handle the click event? 回答1: You can check the clickCount of the mouseDown event: if ([event clickCount] > 1) { // ... do double-click action } else { // ... do single-click action } 来源： https://stackoverflow

问题 I have a UIButton and I am trying to call 2 different actions from one UIButton event, since that button needs to do two things, but I need to do them in a certain order. No matter how I try, I can't seem to change the order in which the Actions fire. Is there a way for me to decide this, or is it random? In what order do IBActions get fired from the same component? Is there a way to call them in a certain order? 回答1: Why not create a single, new method that is called by the button and runs

问题 I wanted to know how I would go about animating a UIButton down when clicked via -(IBAction) Thanks in advance! 回答1: Inside your IBAction UIButton *button = (UIButton*)sender; //animates button 25 pixels right and 25 pixels down. Customize CGRect newFrame = CGRectMake(button.frame.origin.x + 25, button.frame.origin.y + 25, button.frame.size.width, button.frame.size.height); [UIView animateWithDuration:0.3f delay:0.0f options: UIViewAnimationOptionCurveLinear animations:^{ [button setFrame

问题 I have tried to connect several buttons to a single IBAction in Xcode 8 however it does not work. I tried the practices outlined here Xcode8 cannot connect multiple/single uibuttons to single @IBAction in swift file still to no avail. can anyone shed some light as to why or if it is simply still just a bug? 回答1: Works fine for me in Xcode 8.1 on a new Swift 3 project. You have to control-drag from the button to the center side of the method to select it if it already exists rather than drag

问题 Closed . This question needs details or clarity. It is not currently accepting answers. Want to improve this question? Add details and clarify the problem by editing this post. Closed 6 years ago . I have UItableViewCell created with a nib file, and have put in my cell a button. i hace created an IBAction to associate an action when the the user click the button.but i have a crash and i don't know what it is the problem, i have set all the things necessary. //in my .h -(IBAction)go; //in my