uibarbuttonitem

问题 after tapping the 'record' BarButtonItem I would like to keep it programmatically highlighted until the recording is over. The highlighting graphics of iOS are very good, therefor I would like to remain or set that state. Up to now I found 'setSelected' and 'setHighlighted' but these do not work on a UIBarButtonItem. Any suggestions on how to solve this? Thank you in advance, Koen. 回答1: setSelected and setHighlighted work fine on UIControls, but not UIBarButtonItems (which are not UIControls)

问题 I am creating a UIBarButtonItem and adding it to my navigation bar like so: (void)viewDidLoad { ... // Add the refresh button to the navigation bar UIButton *refreshButton = [UIButton buttonWithType:UIButtonTypeCustom]; [refreshButton setFrame:CGRectMake(0,0,30,30)]; [refreshButton setImage:[UIImage imageNamed:@"G_refresh_icon.png"] forState:UIControlStateNormal]; [refreshButton addTarget:self action:@selector(refreshData) forControlEvents:UIControlEventTouchUpInside]; UIBarButtonItem

问题 I have the following code: func navbarbutton() { UIView.animateWithDuration(0.2, animations: { () -> Void in let current = self.navigationController?.navigationBar.frame self.navigationController?.navigationBar.frame = CGRectMake(self.frame!.origin.x, self.frame!.origin.y, self.frame!.size.width, current!.size.height + 50) self.navigationController?.navigationBar.layoutIfNeeded() }) } I'm able to increase the height of the navigation bar by 50 dp. That's not the issue for me. The issue I'm

问题 Having a problem with UIBarButtonItem resizing when returning to VC with different values for frame and image. var selectedR = 1 var leftFrame = CGRect() var leftImage = UIImage() override func viewDidLoad() { super.viewDidLoad() if selectedR == 0 { leftFrame = CGRect(x: 0, y: 0, width: 33, height: 33) leftImage = UIImage(named: “pic-0”)! } else if selectedR == 1 { leftFrame = CGRect(x: 0, y: 0, width: 79, height: 33) leftImage = UIImage(named: "pic-1")! } else if selectedR == 2 { leftFrame =

问题 From the rootViewController I navigate to a UIViewController if (self.contr == nil) { ExampleViewController *controller = [[ExampleViewController alloc] initWithNibName:@"Example" bundle:[NSBundle mainBundle]]; self.contr = controller; [controller release]; } [self.navigationController presentModalViewController:self.contr animated:YES]; In the UIViewController I have the method -(IBAction) goBack:(id)sender { [self.navigationController dismissModalViewControllerAnimated:YES]; } I added the

问题 From the rootViewController I navigate to a UIViewController if (self.contr == nil) { ExampleViewController *controller = [[ExampleViewController alloc] initWithNibName:@"Example" bundle:[NSBundle mainBundle]]; self.contr = controller; [controller release]; } [self.navigationController presentModalViewController:self.contr animated:YES]; In the UIViewController I have the method -(IBAction) goBack:(id)sender { [self.navigationController dismissModalViewControllerAnimated:YES]; } I added the

问题 I have a bar button, let's call it button 1, which when clicked, programatically segues to a different page. However, after clicking another button (button 2), button 1's title is changed. From then on, button 1 no longer responds regardless of whether it's title has been changed back by clicking button 2 again. I hope you understand, if not - I can clarify code: (button 2 is edit) - (1 is info/add) -(void)editButton:(id)sender { [self setEditing:(![self isEditing])]; self.navigationItem

问题 I am trying to enable a bar button if the user is labeled "Yes" in the SubscribedUser key. I really do not know how to do this. I have used queries before but only to call objects onto the screen, nothing like this before. Here is what I have right now, I know it is wrong but I hope you get the idea of what I'm trying to do right now: func enableButton() { var query: PFQuery = PFQuery(className: "User") query.whereKey("username", equalTo: PFUser.currentUser().username) if query.valueForKey(

问题 I'm working with MonoTouch and I have come up with three questions around buttons that I'm hoping someone can help me with. I'm trying to change the "Back" button in the title bar. How do I do this? I've seen the thread posted here: How to change text on a back button. However, that doesn't work. I get the vibe that I'm not accessing the controller property. Currently, I receive a NullReferenceException when I attempt to set the button text in the ViewDidLoad method. Currently, I'm trying to

问题 I have looked through the existing questions on this subject matter, and there appears to be no answers post iOS 11 (which appeared to break the gesturerecognizers). Is there a way to detect the short press / long press on a UIBarButtonItem? Apple uses this functionality in Pages, Numbers, Keynote for Undo / Redo. 回答1: Try this @IBOutlet weak var btn: UIButton! override func viewDidLoad() { let tapGesture = UITapGestureRecognizer(target: self, #selector (tap)) //Tap function will call when