I have a UIView, holding a UIButton, set as my navigationItem.titleView. When I update the text for this button, it briefly blinks (disappearing and reappearing with the new text.)
Is there anyway to keep it visible when it's changed? So, if I change 2015-2016 it appears as if only the last digit is updated to 6?
Thanks
I solved my problem. This has more to do with UIButton than anything in the navigationBar's titleView.
If a UIButton is set as [yourButton buttonWithType:UIButtonTypeCustom], then it will not blink when it has been updated with [yourButton setTitle:#"title" forState:UIControlStateNormal];
Related
I have a UITextField for search in my Application.
When user taps on the Clear Button in the right of the Search Text Field I need to hide this textfield.
So, can I show the Clear Button then TextField is empty? I need to do it always to provide the ability hiding TextField.
Just create a Custom button and set it as rightView for your TextField
UIButton *cleanBtn = [UIButton buttonWithType:UIButtonTypeCustom];
// Set clear image for your button
[cleanBtn setImage:img forState:UIControlStateNormal];
[cleanBtn addTarget:self action:#selector(cleanTextField:) forControlEvents:UIControlEventTouchUpInside];
yourTextField.rightViewMode = UITextFieldViewModeAlways;
yourTextField.rightView = cleanBtn;
I tried to fix this issue with creating a custom button and setting the rightView of my text field. It did not solve my problem. There is no button on the right view.
I have added UIButton in Interface Builder using Auto Layout and placed it on my text field. It works. It's strange solution but it works.
I would like to improve performance by making my views opaque where appropriate. I have a UIButton that is showing red in the simulator - it's only red around the text of the button, not the entire frame. In the Storyboard, I've enabled Opaque and changed the background color from clear to white, yet it still shows red in the simulator.
How do I change that to green so that it's fully opaque and not trying to work with transparency?
Note that UILabels are fully green when you change its background and opaque to YES.
I am use following code in your case:
[button.titleLabel setOpaque:YES];
[button.titleLabel setBackgroundColor:[UIColor whiteColor]];
// or which-you-want-color
Obviously, you should keep weak reference to your button.
Pretty works. Button size smaller than the screenshot size.
I believe the UIButton is made of a couple of views such as titleLabel. It may be possible to enumerate the UIButtons' subview and set them each to opaque.
UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];
for(UIView *subview in [button subviews]){
subview.opaque = YES;
}
I wanted to put a timer in the title label of a tableViewController. To my surprise, storyboard let me drop a button the title and I got everything working, however, I need to button to differentiate between single and double taps. Single tap starts and stops the timer, and double tap would reset it back to zero. In order to make a button recognize both type of taps, I had to create a subclass of UIButton, which means that I am now adding the button programmatically rather than through storyboard. In viewDidLoad, I tried to add the button to the titleView of the navigationItem but nothing's showing when I run it in the simulator. I set the x,y coordinates like this
self.navigationItem.titleView.bounds.size.width/2
thinking it would place the button in the middle.
I'm not sure if I've messed up the coordinates or done something else wrong, but nothing's showing. Can you suggest how it might be done?
MMTimerButton *button = [MMTimerButton buttonWithType:UIButtonTypeRoundedRect];
[button setTitle:#"Button" forState:UIControlStateNormal];
button.frame = CGRectMake(self.navigationItem.titleView.bounds.size.width/2, self.navigationItem.titleView.bounds.size.height/2, 160.00, 40.0);
[self.navigationItem.titleView addSubview:button];
I've got a UIButton that, when selected, shouldn't change state when being touched.
The default behaviour is for it to be in UIControlStateHighlighted while being touched, and this is making me angry.
Suggestions?
Your button must have its buttonType set to Custom.
In IB you can uncheck "Highlight adjusts image".
Programmatically you can use theButton.adjustsImageWhenHighlighted = NO;
Similar options are available for the "disabled" state as well.
In addition to above answer of unchecking "highlight adjusts image" in IB, make sure that button type is set CUSTOM.
This will work for you:
[button setBackgroundImage:[UIImage imageNamed:#"button_image"] forState:UIControlStateNormal];
[button setBackgroundImage:[UIImage imageNamed:#"button_image_selected"] forState:UIControlStateSelected];
[button setBackgroundImage:[UIImage imageNamed:#"button_image_selected"] forState:UIControlStateSelected | UIControlStateHighlighted];
3rd line is the trick here...
This works the same for setting image/backgroundImage
adjustsImageWhenHighlighted = NO;
button.adjustsImageWhenDisabled = NO;
is equally useful for having your own appearance of a disabled button.
Depending on what changes from the default to the highlighted state of the button, you can call a couple of methods to set them to what you need. So if the image changes you can do
[myButton setImage:[myButton imageForState:UIControlStateNormal] forState:UIControlStateHighlighted];
If the text changes you can do
[myButton setTitle:[myButton titleForState:UIControlStateNormal] forState:UIControlStateHighlighted];
other similar functions:
- (void)setTitleColor:(UIColor *)color forState:(UIControlState)state
- (void)setTitleShadowColor:(UIColor *)color forState:(UIControlState)state
For Swifty Developer -
yourButton.adjustsImageWhenHighlighted = false
Swift 3+
button.adjustsImageWhenHighlighted = false
button.adjustsImageWhenDisabled = false
OK here's an easy solution if this works for you, after a week of banging my head on this it finally occurred to me to just set highlighted=NO for the 1st line of the IBAction method for the TouchUpInside or TouchDown, or whatever works. For me it was fine on the TouchUpInside.
-(IBAction)selfDismiss:(id)sender {
self.btnImage.highlighted = NO;
NSLog(#"selfDismiss");
etc, etc, etc.
}
make your button Type - "Custom"
and Uncheck - Highlighted Adjust image and
you are done.
just two things:
UIButton *btnTransparentComponent = [UIButton buttonWithType:UIButtonTypeCustom];
btnTransparentComponent.adjustsImageWhenHighlighted = NO;
I had a similar issue and found that "unchecking" Clears Graphic Content in interface builder fixed my issue
After the introduction of Style, you have to set the style to Default in IB along with setting the type to Custom to be able to disable the highlighting effect completely. Otherwise your button text will keep highlighting.
*Setting the Style to Default resets the text color to white.
avoid to set UIButton's Line Break to Clip, use instead the standard Truncate Middle
I have a UIButton, that when pressed, brings up a new view where the user can change some settings. When the view is dismissed, I'd like to update the title/text of the UIButton to reflect the new state. I'm calling:
[myButton setTitle: #"myTitle" forState: UIControlStateNormal];
[myButton setTitle: #"myTitle" forState: UIControlStateApplication];
[myButton setTitle: #"myTitle" forState: UIControlStateHighlighted];
[myButton setTitle: #"myTitle" forState: UIControlStateReserved];
[myButton setTitle: #"myTitle" forState: UIControlStateSelected];
[myButton setTitle: #"myTitle" forState: UIControlStateDisabled];
But it never seems to change from the original text/title as specified in IB.
I solved the problem just setting the title parameter for UIControlStateNormal, and it automatically works on the other states. The problem seems to be when you set another UIControlState.
[myButton setTitle: #"myTitle" forState: UIControlStateNormal];
Do you have the button specified as an IBOutlet in your view controller class, and is it connected properly as an outlet in Interface Builder (ctrl drag from new referencing outlet to file owner and select your UIButton object)? That's usually the problem I have when I see these symptoms.
Edit: While it's not the case here, something like this can also happen if you set an attributed title to the button, then you try to change the title and not the attributed title.
As of Swift 4:
button.setTitle("Click", for: .normal)
I discovered another problem. It may be a bug introduced in iOS 5, but I thought I'd point it out for anyone else who encounters it.
If you don't set any default text for the button in the XIB, no text will ever appear if you set it programmatically. And if you do set text in the XIB, any text you subsequently assign to the button programmatically will be truncated to the size of the default text.
And finally, if you're showing the view with your button and then invoke another view (like an ActionSheet) and then dismiss it, the text that you assigned to the button programmatically will be erased and the button caption will return to whatever you set up in the XIB.
Even though Caffeine Coma's issue was resolved, I would like to offer another potential cause for the title not showing up on a UIButton.
If you set an image for the UIButton using
- (void)setImage:(UIImage *)image forState:(UIControlState)state
It can cover the title. I found this out the hard way and imagine some of you end up reading this page for the same reason.
Use this method instead
- (void)setBackgroundImage:(UIImage *)image forState:(UIControlState)state
for the button image and the title will not be affected.
I tested this with programmatically created buttons and buttons created in a .xib
for swift :
button.setTitle("Swift", forState: UIControlState.Normal)
One more possible cause is this:
If you attempt to set the button's title in the (id)initWithNibName: ... method, then you're button property will still be nil. It hasn't yet been assigned to the UIButton.
You must be sure that you're setting your buttons in a method like (void)viewWillLoad or (void)viewWillAppear, but you probably don't want to set them as late as (void)viewDidAppear.
Turns out the docs tell you the answer! The UIButton will ignore the title change if it already has an Attributed String to use (with seems to be the default you get when using Xcode interface builder).
I used the following:
[self.loginButton
setAttributedTitle:[[NSAttributedString alloc] initWithString:#"Error !!!" attributes:nil]
forState:UIControlStateDisabled];
[self.loginButton setEnabled:NO];
Sometimes it can get really complicated. The easy way is to "refresh" the button view!
//Do stuff to your button here. For example:
[mybutton setEnabled:YES];
//Refresh it to new state.
[mybutton setNeedsDisplay];
I kept having problems with this, the only solution was to add an image and label as subviews to the uibutton. Then I discovered that the main problem was that I was using a UIButton with title: Attributed. When I changed it to Plain, just setting the titleLabel.text did the trick!
#funroll is absolutely right. Here you can see what you will need Make sure function runs on main thread only. If you do not want deal with threads you can do like this for example: create NSUserDefaults and in ViewDidLoad cheking condition was pressed button in another View or not (in another View set in NSUserDefaults needed information) and depending on the conditions set needed title for your UIButton, so [yourButton setTitle: #"Title" forState: UIControlStateNormal];
Make sure you're on the main thread.
If not, it will still save the button text. It will be there when you inspect the object in the debugger. But it won't actually update the view.