I am facing very strange issue.
In interface builder I am trying to set images for "normal" state config and for "selected" state config. but by clicking the button my image is not getting changed.
even I write the code in viewDidLoad method.
[btnCheckBoxMale setImage:[UIImage imageNamed:#"blankcheckbox.png"] forState:UIControlStateNormal];
[btnCheckBoxMale setImage:[UIImage imageNamed:#"checkbox.png"] forState:UIControlStateSelected];
but my images are not getting changed on cliking on it
can anyboday say what is the problem?
Set the image to different states in interface builder instead of setting it in code. Please see the screenshot for how to set it. Try this & if you are facing any problem then ask me.
It will work if you set manually in button action:
btnCheckBoxMale.selected = YES;
Because by default UIButton has only two states - Normal and Highlighted. And other states like selected and disabled you have to control manually.
just set selected when you call the method on button click event.. for example..
-(IBAction) btnCheckBoxMale_Clicked:(id)sender{
[btnCheckBoxMale setSelected:YES];
}
-(IBAction) btnCheckBoxMale_Clicked:(id)sender{
UIButton * btnCheckBoxMale = (UIButton *)sender;
[btnErase setSelected:! btnCheckBoxMale];
}
When setting a SearchBarDisplay, using IB or programmatically it gets a Cancel button right to the search window. The text on the button says "Cancel". How do I change text to another language.
I know how to change text for a Done button at the Navbar using only SearchWindow but that does not seem to work for this button which comes as default.
And a similar question is the text "No result" coming up in the table if no match.
How change to another language?
You can change title of you cancel but of searchBar by this :
for (UIButton *v in srchBar.subviews)
{
NSLog(#"%#",v);
if ([v isKindOfClass:[UIButton class]])
{
[v setTitle:#"Hello" forState:UIControlStateNormal];
}
}
now set this title as per your language.
i tried this and its working in my demo app.
let me know if it wont work for you.
I'm losing my mind over this one. I have UIButton connected as Outlet. I want to change it's image. In the viewDidLoad function, I try to set the image like so:
[button1 setImage:[UIImage imageNamed:#"house.png"] forState:UIControlStateNormal];
Nothing happens. However, if I use ImagePicker, it somehow works. In the ImagePickers function "didFinishPickingImage", I repeat the exactly same command as above for setting image and it works, the image is displayed normally.
I've been thinking that maybe the button's image is not refreshing itself, but trying to call [button1 setNeedsDisplay], or [button1.imageView setNeedsDisplay] or even [button1.imageView.image setNeedsDisplay] does nothing.
Does anyone have any idea about this? I've wasted two hours by now and I'm really getting frustrated, because I'm certain that the reason must be so stupid it's unbelivable.
Please check your button type.
If your button type is "System" you should change it to "Custom"
Two things to do here:
#1, change your code to:
[button1 setImage:[UIImage imageNamed:#"house.png"] forState:UIControlStateNormal];
and #2
make sure your UIImage returns a valid image.
In other words,
UIImage * imageToSet = [UIImage imageNamed: #"house.png"];
if(imageToSet)
{
[button1 setImage:[UIImage imageNamed:#"house.png"] forState:UIControlStateNormal];
} else {
// if you see this line in your console, then you know where to look for a problem
NSLog( #"why is my image object nil?");
}
For anyone who will find themselves in a similar situation; I was using the mentioned button inside a custom cell for table view. However, the cells aren't loaded right away (i.e. inside viewDidLoad/viewWillAppear etc.), but inside the tableView:cellForRowAtIndexPath function. All my button variables were nil at that point. My solution was to load the image after the cell has been created and it has worked straight away afterwards.
Here are a couple additional notes. UIButton setImage: forState: is the correct method:
[button1 setImage:[UIImage imageNamed:#"house.png"] forState:UIControlStateNormal];
imageNamed is a great convenience method for grabbing the image, but make sure it returns an object. Forgetting to include the image file in the current target gets me all of the time.
[UIImage imageNamed:#"house.png"]
You also don't need the extension. The SDK works this out.
[UIImage imageNamed:#"house"]
And even though UIControlState is a bit mask, you cannot OR the values together. This does not not not work and I must must must remember this because it gets me every time I use the call.
// NO NO NO
[button1 setImage:[UIImage imageNamed:#"house"] forState:UIControlStateNormal|UIControlStateSelected];
// YES
[button1 setImage:[UIImage imageNamed:#"house"] forState:UIControlStateNormal];
[button1 setImage:[UIImage imageNamed:#"house"] forState:UIControlStateSelected];
Was getting the same problem when UIbutton was in UITableViewCell.
UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];
[button setImage:[UIImage imageNamed:#"detail.png"] forState:UIControlStateNormal];
should work in UITableViewCell
Glad to know that the problem is solved but none of the answers actually addresses the problem.
Generally, if the code is correct, then the error shifts from "syntax error" to the "logical error" category. There is no definite guide to handle it but here is a small checklist that can help anyone to troubleshoot their code.
1) The IBOutlet is not connected or renamed.
2) Make sure that the UIButton type is custom.
3) The image is set (more than once), somewhere else in the code.
4) You are trying to set the Image through any sync method which is not using the main thread. (There are several threads on that alone).
5) If you are nesting the images as subviews, make sure the problem isn't with their parent view.
6) If it is appearing in Simulator but not in the device, It's a lettercase (Uppercase, lowercase difference in the code and the filename.
7) Modern simulators works with very low GPU memory on older machines. You can tweak the simlator options to make it appear. E.g (Command + Right Arrow) twice to change the simulator orientation and your changes will appear.
There are few other but common pitfalls where developers usually overlook
1) The image doesn't exist OR you are making a spelling mistake.
2) The filetype is different than mentioned. (JPG, PNG).
Last thing you'll want to check - make sure you're setting the image on the main thread! Just ran into an issue where I was setting a button image in a callback from ALAssetLibrary (fetching images from photo library). The image wouldn't update until I tapped the button. Turns out the callback was happening off main...
for those having issues with system images not appearing, just use systemName: instead of named
if let starImg = UIImage(systemName: "star.fill") {
button.setImage(starImg, for: .normal)
}
It's for ios13 and later...
For me it was to move the line:
[button1 setImage:[UIImage imageNamed:#"house.png"] forState:UIControlStateNormal];
from awakeFromNib method
to viewDidLoad method
I guess,
don't create like this
UIButton *nextButton = [UIButton buttonWithType:UIButtonTypeRoundedRect];
by this create method ,UIButton is create by use default type,so your background image is not work.
try this,
UIButton *nextButton = [[UIButton alloc] initWithFrame:CGRectMake(9, 154, 300, 48)];
or other,except buttonWithType
This is happening because the state of the Button doesn't stays selected once clicked by default.
I solved it by making an IBaction on that button click and toggling the selected state.
-(IBAction) checkButtonClicked:(id)sender{
checkButton.selected = !checkButton.selected;
}
In my case, it is drawn by custom animation code and not set by the image, so it doesn't work by setting any image, it has to change the animation code.
With images, you have to import them into the project not as references but as copies. So when you go to add files to project, choose "Create groups" instead of "Create folder references". Also make sure "Copy items if needed" is checked.
This is confusing because importing as references works when you are using images as textures (e.g. for Sprites). However, it doesn't work when you want to use images for buttons (e.g. for using image name in [UIImage imageNamed:#"house.png"]
I faced this same issue of the image not being shown on the UIButton.
I had to change this line -
myButton.setImage(<my_UIImage_object>, for: [.normal, .focused])
to this -
myButton.setImage(<my_UIImage_object>, for: .normal)
I'm trying to change the title of a button when the user press on it with the following code:
- (IBAction) hideKB: (UIButton *) sender {
sender.titleLabel.text = #"↓";
}
But when I click the app crashes and I can't understand why.
Removing the sender stuff, the button works with no problems.
The correct method signature for an action is
- (IBAction)action:(id)sender
Your app is crashing because your object is being sent a message it doesn't understand.
Try replacing your code with something along the lines of:
- (IBAction)hideKB:(id)sender {
UIButton *button = (UIButton *)sender;
[button setTitle:#"↓" forState:UIControlStateNormal];
}
As you may notice I've also changed the line that sets the button title. This is because you should never manipulate a UIButton's titleLabel property directly, but rather you should be using the appropriate setter method as shown above.
Edit: To clarify, most controls will allow you to use dot notation to edit the text property of their titleLabel. However, UIButton instances support different titles (as well as images and background images) depending on the state they're in.
If you're wondering why a UIButton could be in one of several different states, a good example you often see is buttons that are "greyed out". What this means is that those buttons are in the UIControlStateDisabled state. You can find a list of all the possible states for a control in the documentation.
Try using
- (void)setTitle:(NSString *)title forState:(UIControlState)state
e.g.
[sender setTitle:"↓" forState:UIControlStateNormal];
you can try with:
[(UIButton *)sender setTitle: #"↓"" forState: UIControlStateNormal];
For more information, you can refer to setTitle:forState: in UIButton Class Reference
Hope this helps.
I have a situation I'm trying to change background image of 4 buttons like this:
if(some condition){
[firstSeverityButton setBackgroundImage:[UIImage imageNamed:#"greySeverity.jpg"] forState:UIControlStateDisabled];
[secondSeverityButton setBackgroundImage:[UIImage imageNamed:#"greySeverity.jpg"] forState:UIControlStateNormal];
[thirdSeverityButton setBackgroundImage:[UIImage imageNamed:#"greySeverity.jpg"] forState:UIControlStateNormal];
[fourthSeverityButton setBackgroundImage:[UIImage imageNamed:#"greySeverity.jpg"] forState:UIControlStateNormal];
[fifthSeverityButton setBackgroundImage:[UIImage imageNamed:#"redSeverity.png"] forState:UIControlStateNormal];
}
But the background of the other four disappears when I touch any one
Please enlighten me on this how can his be tackled.
May be you are looking for the radiobutton, You can write down a custom class for radio button and make things work out easily.
[firstSeverityButton setBackgroundImage:[UIImage imageNamed:#"greySeverity.jpg"] forState:UIControlStateDisabled];
This code actually works fine, with every control state. I think the problem is with the initial image for the button and the current button state (in both nib and code).
The state of buttons can be changed with:
button.enabled=yes;
button.highlighted = NO;
button.selected = NO;
When you setup image for control state specifically, the change on image appear on that specific control state. So the change depends on both the initial image and the current control state of button
NOTE: We are applying change on the background image. There is an image property for the button which can actually hide the changes of background image. If you setup the image
[firstSeverityButton setImage:[UIImage imageNamed:#"greySeverity.jpg"] forState:UIControlStateDisabled];
anywhere in code and maybe it can hide your background image setting.
Also there is a possibility of error in your if-else loop ...go through the loops and verify every conditions whether the images get set properly.