I have a UIButton in the footer of UITableView. It has an empty checkbox as its unselected state, and a checked box as its selected state. It works perfectly in portrait, but if the view ever rotates to landscape, the button's image is frozen in whatever state it was when it rotated. The button still sends messages correctly after rotation, but the image does not change.
self.theButton = [UIButton buttonWithType:UIButtonTypeCustom];
[self.theButton setImage:checkbox
forState:UIControlStateNormal];
[self.theButton setImage:checkedBox
forState:UIControlStateSelected];
This code appears in the tableView:viewForFooterInSection: of my view controller. In the action linked to the button, I set self.theButton.selected = !self.theButton.selected;
What's going on?
You can do this in your button action
- (void)didTapCheckbox:(id)sender {
UIButton *btn =(UIButton *)sender;
if (btn.selected == YES) {
[btn setSelected:NO];
}
else{
[btn setSelected:YES];
}
}
instead of your code just do this
if(self.theButton == nil){
self.theButton = [UIButton buttonWithType:UIButtonTypeCustom];
[self.theButton setImage:checkbox
forState:UIControlStateNormal];
[self.theButton setImage:checkedBox
forState:UIControlStateSelected];
}
Related
i have 2 buttons that keep with the pressed image even when they are released, until the other button is pressed, then the image returns to the normal image my code is this:
- (IBAction)button1_touch:(UIButton *)sender
{
[Button2 setImage:[UIImage imageNamed:#"b2Released.png"] forState:UIControlStateNormal];
[Button1 setImage:[UIImage imageNamed:#"b1Pressed.png"] forState:UIControlStateNormal];
}
- (IBAction)button2_touch:(UIButton *)sender
{
[Button1 setImage:[UIImage imageNamed:#"b1Released.png"] forState:UIControlStateNormal];
[Button2 setImage:[UIImage imageNamed:#"b2Pressed.png"] forState:UIControlStateNormal];
}
the code above works fine when the app starts, the behavior is the expected pressing both buttons, images change correctly, but when i press other button than those two, the "Button2" once it gets the "B2Pressed.png" image, it never returns to its released image, i wrote a nslog in button1_touch and it gets printed as expected, and the Button1 gets its pressed image, but the Button2 is not getting its released image, is like the method setImage of UiButton gets broken when i press other button than those two, other buttons are independent from those two, for me this behavior has absolutely no sense at all, could it be xcode broken? i am working on xcode 7.2
EDIT:
the problem occurs when i press another button only if that button has a action selector assigned to it (UIControlEventTouchUpInside).
You can use selected state of UIButton for this purpose:
- (void)viewDidLoad {
// ...
// the place where you do buttons setup
[button1 setImage:[UIImage imageNamed:#"b1Released"] forState:UIControlStateNormal];
[button1 setImage:[UIImage imageNamed:#"b1Pressed"] forState:UIControlStateSelected];
[button2 setImage:[UIImage imageNamed:#"b2Released"] forState:UIControlStateNormal];
[button2 setImage:[UIImage imageNamed:#"b2Pressed"] forState:UIControlStateSelected];
}
- (IBAction)firstButtonTouch:(UIButton *)sender {
button1.selected = YES;
button2.selected = NO;
}
- (IBAction)secondButtonTouch:(UIButton *)sender {
button1.selected = NO;
button2.selected = YES;
}
Confession: I have been through every possible link I could find, but unfortunately none work for me.
I am creating buttons dynamically. When a button is selected, it should change the color of the selected button and the rest should remain the default color. This way, the user can identify which button is selected.
Suppose there are 3 buttons: all blue in color, and when I select the first one, it should change to white and other two should remain blue. When I select the second, the first one should go back to blue and the second should now be white.
btnCounts data I am fetching from server and would vary.
-(void)createButtons{
for (int i=0; i<btnCounts; i++) {
UIButton *btn = [UIButton buttonWithType:UIButtonTypeRoundedRect];
[btn setTag:i];
[btn setFrame:CGRectMake(xVal, 0, width/btnCounts, 40)];
// [btn setImage:[UIImage imageNamed:#"btn_image.png"] forState:UIControlStateNormal];
[btn setBackgroundImage:[UIImage imageNamed:#"blue.png"] forState:UIControlStateNormal];
[btn setBackgroundImage:[UIImage imageNamed:#"white.png"] forState:UIControlStateSelected];
[btn setTitle:name forState:UIControlStateNormal];
[btn setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal];
[btn addTarget:self action:#selector(btnClicked:) forControlEvents:UIControlEventTouchUpInside];
[scrV addSubview:btn];
xVal += self.view.frame.size.width/btnCounts+1;
}
}
Now, in btnClicked: method I am passing the button as a parameter, so that I can use selected button.
-(void)btnClicked:(UIButton *)button
{
int tag = (int)button.tag;
//...
}
Please help me to find what I am missing here.
Thanks.
Create an instance UIButton variable to house the selected button so that you can deselect it when the next button is tapped. If you only pass the currently-tapped button to your btnClicked: method, you won't know which button to deselect (if any).
#implementation ClassName {
UIButton *previousButton;
}
...
- (void)btnClicked:(UIButton *)button
{
if(previousButton)
[previousButton setBackgroundColor:[UIColor blueColor]];
previousButton = button;
[button setBackgroundColor:[UIColor whiteColor]];
// do whatever else you need to do here
}
For that you need to store selected button in temporary object.
Create button in interface(.h) file:
UIButton *selectedButton;
Than add following line in -(void)createButtons method before for loop.
selectedButton = nil;
for() {...}
Here selectedButton is set to nil because initially none of the buttons are selected.
And finally replace your -(void)btnClicked:(UIButton *)button method with following method.
-(void)btnClicked:(UIButton *)button {
if(selectedButton) {
selectedButton.selected = NO;
}
button.selected = YES;
selectedButton = button;
}
If you want to make any button initially selected than assign that button to selectedButton like in btnClicked method.
I have this method for a twitter button
-(IBAction)tweetThis:(id ) sender{
if ([sender isSelected]) {
[sender setImage:[UIImage imageNamed:#"TwitterButtonBlue.png"] forState:UIControlStateNormal];
[sender setSelected:NO];
}
else {
[sender setImage:[UIImage imageNamed:#"TwitterButtonBlack.png"] forState:UIControlStateSelected];
[sender setSelected:YES];}
}
in the simulator when i tap the button (which I made in IB as a touch up inside) the button clicks and changes to images but it doesn't go back to the original button image so for instance the blue.png changes to black.png but stays black and doesn't go back to blue. Any way I canf ix this
If I understand correctly, you're just trying to change the button image when the button is tapped. If so, you can simply just configure the button (in viewDidLoad or interface builder) like this:
[button setImage:[UIImage imageNamed:#"TwitterButtonBlue.png"] forState:UIControlStateNormal];
[button setImage:[UIImage imageNamed:#"TwitterButtonBlack.png"] forState:UIControlStateSelected];
The UIButton will handle the image switching for you.
Is there any checkbox control in the object library for iOS applications? The nearest thing I see is the switch control, which can take a boolean value.
You can use the selected state of a UIButton, set different images (or also texts) for differents (via code, or Interface Builder) :
[button setImage:[UIImage imageNamed:#"selected.png"]
forState:UIControlStateSelected];
[button setImage:[UIImage imageNamed:#"unselected.png"]
forState:UIControlStateNormal];
And in the touch up inside action :
- (IBAction)buttonTouched:(id)sender
{
button.selected = !button.selected;
// add other logic
}
//define property of button
Declare Unchecked Image
- (void)viewDidLoad
{
[_checkboxButton setBackgroundImage:[UIImage imageNamed:#"unchecked.png"] forState:UIControlStateNormal];
}
Checked Image.
- (IBAction)buttonTapped:(id)sender
{
if (_checkboxButton.selected == YES)
{
[_checkboxButton setBackgroundImage:[UIImage imageNamed:#"unchecked.png"] forState:UIControlStateSelected];
_checkboxButton.selected = NO;
}
else
{
[_checkboxButton setBackgroundImage:[UIImage imageNamed:#"checked.png"] forState:UIControlStateNormal];
_checkboxButton.selected = YES;
}
}
This is the code I use for two checkboxes on the screen. (I put them at the bottom of two pictures that are also on the screen. I use the UIControlEventTouchDown to call the checkBoxTapped method. This method talks to my main view controller where I decide if the answer was correct or incorrect. Then the main view controller calls back the this view and tells it to change the blank textbox to either a check:
or an x
// Put the Checkboxes on the screen
UIImage *checkBox = [UIImage imageNamed:#"Checkbox"];
self.checkBoxLeft = [UIButton buttonWithType:UIButtonTypeCustom];
[self.checkBoxLeft setImage:checkBox forState:UIControlStateNormal];
[self.checkBoxLeft setFrame:checkBoxFrameLeft];
[self.checkBoxLeft addTarget:self
action:#selector(checkBoxTapped:)
forControlEvents:UIControlEventTouchDown];
[self.checkBoxLeft setTitle:#"checkBoxLeft" forState:UIControlStateNormal];
self.checkBoxLeft.contentEdgeInsets = insets;
self.checkBoxLeft.showsTouchWhenHighlighted = NO; // Keeps it from turning gray
self.checkBoxRight = [UIButton buttonWithType:UIButtonTypeCustom];
[self.checkBoxRight setImage:checkBox forState:UIControlStateNormal];
[self.checkBoxRight setFrame:checkBoxFrameRight];
[self.checkBoxRight addTarget:self
action:#selector(checkBoxTapped:)
forControlEvents:UIControlEventTouchDown];
[self.checkBoxRight setTitle:#"checkBoxRight" forState:UIControlStateNormal];
self.checkBoxRight.contentEdgeInsets = insets;
self.checkBoxRight.showsTouchWhenHighlighted = NO; // Keeps it from turning gray
- (void)checkBoxTapped:(UIButton *)buttonPressed {
[[self delegate] checkBoxTapped:buttonPressed.currentTitle];
}
- (void)highlightCheckbox:(NSString *)checkboxToHighlight withHighlight:(NSString *)highlight {
if ( [checkboxToHighlight isEqualToString:#"left"] ){
[self.checkBoxLeft setImage:[UIImage imageNamed:highlight] forState:UIControlStateNormal];
} else {
[self.checkBoxRight setImage:[UIImage imageNamed:highlight] forState:UIControlStateNormal];
}
}
When I touch the button at that time I want to change image & when i release the touch button image is as it is.
I want to apply below code but it's not with my expectation.
please give me any suggestion.....
-(IBAction)actionEnter:(id)sender{
if ([sender isSelected]) {
[sender setImage:[UIImage imageNamed:#"enter-hover.png"]
forState:UIControlStateNormal];
[sender setSelected:NO];
} else {
[sender setImage:[UIImage imageNamed:#"enter.png"]
forState:UIControlStateSelected];
[sender setSelected:YES];
}
You can use UIControlStateHighlighted for this.
[myButton setImage:[UIImage imageNamed:#"enter-hover.png"]
forState:UIControlStateHighlighted];
You can also set this from interface builder by setting the image for highlighted state.
I think this should do it. Set the images after creating the button
[yourButton setImage:[UIImage imageNamed:#"enter-hover.png"]
forState:UIControlStateSelected];
[yourButton setImage:[UIImage imageNamed:#"enter.png"]
forState:UIControlStateNormal];
and do this
- (IBAction)actionEnter:(id)sender{
UIButton *button = (UIButton *)sender;
button.selected = !button.selected;
}
In Swift:
button.setImage(UIImage(named: "enter.png"), forState: [.Selected, .Highlighted])
I think, you could set the image in the beginning for normal and selected state ..
Try with below when you create the UIButton object. [Use the images as per your requirement]
[myButton setImage:[UIImage imageNamed:#"enter.png"]
forState:UIControlStateNormal];
[myButton setImage:[UIImage imageNamed:#"enter-hover.png"]
forState:UIControlStateSelected];
#7KV7 got me thinking. I have favorite and ignore buttons that I want to use to mark favorite pictures and pictures that I never want to see again. I used his method to initialize the buttons and then slightly modified his method to toggle the buttons on and off.
In this example, if you mark a picture as a favorite, you want to turn off the ignore button and vice versa. The delegate handles the database stuff.
self.favoriteButton = [UIButton buttonWithType:UIButtonTypeCustom];
self.ignoreButton = [UIButton buttonWithType:UIButtonTypeCustom];
[self.favoriteButton setImage:[UIImage imageNamed:#"Favorite-Selected"]
forState:UIControlStateSelected];
[self.favoriteButton setImage:[UIImage imageNamed:#"Favorite"]
forState:UIControlStateNormal];
[self.ignoreButton setImage:[UIImage imageNamed:#"Ignore-Selected"]
forState:UIControlStateSelected];
[self.ignoreButton setImage:[UIImage imageNamed:#"Ignore"]
forState:UIControlStateNormal];
If you are just toggling a button on or off, you won’t need to make it a property, since the buttonPressed sender knows which button has been pressed. I need to have them be property since I need to tell the opposite button to turn its highlight off.
- (void)favoriteIgnore:(UIButton *)buttonPressed {
// Toggle the tapped button
buttonPressed.selected = ( buttonPressed.selected) ? NO : YES;
id <ScoringToolbarDelegate> TB_delegate = _delegate;
// Turn off the other button and call the delegate
if ([buttonPressed.currentTitle isEqualToString:#"favorite"]) {
self.ignoreButton.selected = NO;
[TB_delegate favoriteButtonPressed];
} else {
self.favoriteButton.selected = NO;
[TB_delegate ignoreButtonPressed];
}
}
to change the image immediately use the backgroundImage property.