I have a button that acts as a switch: I check the current state of the variable (stored in used defaults) and attribute it in viewDidAppear
When I press the left button (ignore the right one) it is acts as it should - swapping out 2 UIImages on button's UIImageView
but as soon as button goes out of focus - button switches image back to the default one. if no default image is specified in IB - button just goes to blank image.
How can I ensure button keeps the image after is goes out of focus? Do I need to implement additional focus delegate methods or something? I'm new tvOS and some things just don't make sense to me yet.
Doh, it appears you cannot just swap out UIImage on UIImageView property and have to use a button setter for such matter:
button.setImage(UIImage, forState: UIControlState.Normal)
It works fine this way
Related
I have a button connected to an action.
When I set the background image on that button, the result is not visually appealing. I want just to see the image not the button but I want the ibaction functionality of that button.
Please help
You need a button with type UIButtonTypeCustom (this will stop the default button appearance from drawing). You can do this in interface builder or in code (although you can't change it once the button is initialized).
In my app i want to open a view with the content of a particular button (so that button should look clicked and should be not clickable). I have 4 button with pictures and all the four have different content inside them (Table view with different content).When this view gets open i want the first button clicked automatically and the content of that button should get displayed and by clicking any other button the content of that button should get displayed and the previous clicked button should be available to click again.
I am using different pictures for clicked and unclicked button.
Thanks,
Maybe this will help you
- (void)didClickButton:(id)sender {
UIButton *optionButton = (UIButton *)sender;
if(lastSelectedButton.tag!= optionButton.tag) {
optionButton.selected = YES;
//According to your needs enable or disable the button's interaction
}
Here lastSelectedButton should be an instance variable.
What you're describing sounds like a segmented control. Essentially the segmented control works like buttons on a tape recorder (dating myself, I know.) When you press Play, it stays down and can't be pressed again until you press Stop or FF or Rew, etc. (Ok, Stop doesn't really work that way, but the rest of the buttons do)
Unfortunately, I don't believe you can use your own images in a UISegmentedControl, but fortunately there's an open-source version that should work for you: https://github.com/xhan/PlutoLand/blob/master/PLSegmentView.h
Once you have the control in place you can change the content of your main view depending on the value of the segmented control. You can handle that in the UIControlEventValueChanged event
Keep a single selector for all the buttons something like
[btn addTarget:self action:#selector(templateSelected:) forControlEvents:UIControlEventTouchUpInside];
and make use of the tag to carry any index to the selector
[btn setTag:integer];
and if you want to keep track of previously clicked button then keep a global (id) and assign the current button address to the that id.
And if you want the first button to be clicked on load then call the function melodramatically during initialization of the first button.
[self templateSelected:firstButton];
I am making multiple custom buttons that look much like this:
It is a simple button with either the green or gray in the "indicator view". What I need some explanation for is: In interfacebuilder there are four states a button can have; Normal, Highlighted, Selected and Disabled. When I provide images for everything except disabled I thought that normal would be when no touches were made on the button, highlighted is while you hold your finger on it and selected would be when after you release finger.
However I do not think thats right now. I use the touch-up-inside event. Is it correct that I need to set the selected/highlighted etc property on the button?
Thank you for your time.
You might want to set to selected and not highlighted.
Highlight is darkening the button for a fraction when touching the UIButton. UIButton can modify your image automaticaly so usually you don't need to provide a highlight image.
Disabled is when it is disabled.
Selected is when it is selected. You can invert the select flag on touch up inside event to make a state button.
[button setSelected:![button isSelected]];
Yes, you need to respond to the touch up inside by setting the button to highlighted.
Btw, it's "disabled" not deselected, but it doesn't sound like you need that state.
how can i just change the color,of a button when i set the focus on the button in iphone.
I mean to say , for example we have 5 buttons, and i am just setting the focus on each of the button. i want those buttons to be higlighted with different color.
but when press or touch up inside the utton, the navigation is made to the respective forms, that is set for that button.
you can write method, for example, let it be
- (void) changeButtonState:(UIButton*) buttonToChange;
then you can call it in your onBtnClk method for button you need. in that method you can change image for your button's UIControlStateNormal mode. and if I understand right, you can use toolbar or tabbar instead of buttons.
Guess you have already asked this issue differently here..
But have you checked the answer?? You can use any of those methods at your will!
I have a UIButton subview inside of a UITableViewCell.
When this button is touched, the user must hold the button for about a half second for the button's image to change to the UIControlStateHighlighted image.
This means that if the user just taps the button as is usually the case, the highlighted state is never shown.
Why does this occur and how can I fix it?
I just encountered this problem and saw that this issue hadn't been closed. After screwing around for a while I found a fix for it.
Now you can fix this by turning off delaysContentTouches or unchecking the "Delays content touches" box on the tableview.
The only negative side effect is that the user won't be able to tap down on a button and initiate a scrolling gesture. However, if the user tries to scroll starting from anywhere that doesn't itself accept touches, the behavior should be the same as before.
The problem is that your UIButton is inside a UITableView. This means that the table view has to determine whether your tap is going to be a swipe or if it's just a tap intended for the button. The table view has to delay sending a message to the UIButton until it knows that the user doesn't intend to swipe and therefore scroll the view instead of pressing the button.
If you don't need a table view, get rid of the UITableView.
Up for David Hodge's answer.
I just want to add a way to remove that "only negative side effect", already described by David: if you start scrolling inside a UIcontrol in a UIScrollView with delayContentTouches=NO, scrolling doesn't work.
SOLUTION
Subclass UIScrollView (or UITableView as the original question) and override:
-(BOOL) touchesShouldCancelInContentView:(UIView *)view {
return YES;
}
Your UIControls inside UIScrollView/UITableView will change their state immediately on tap and the scrollviews will be able to scroll even if the touch starts on some UIControl. Works like a charm.
I just change the image from within the target action method:
[sender setBackgroundImage:[UIImage imageNamed:#"highlighted-image.png"] forState:UIControlStateNormal];
It changes the background image instantly.
Edit: completely re-written following a misunderstanding of the question
One way of thinking of a UIButton is as a shorthand way of setting up an area of the screen that can respond to various instantaneous touch events the response it makes is defined by UIControl's Target-Action system for delivering messages to other objects.
UIControlEventTouchDown sounds like the one you need to respond to. It will be triggered as soon as someone touches inside your button - this is what the "Contact Info" button in SMS does.
UIButton* myButton = [[UIButton buttonWithType:UIButtonTypeRoundedRect];
// SEt up title, frame etc
[myButton addTarget:self action:#selector(myButtonWasPressed) forControlEvents: UIControlEventTouchDown];
[myMainView addSubView:myButton];
Will send a -(void)myButtonWasPressed message to the object this code runs from (ideally you view controller). In myButtonWasPressed you can then add a new view or take any action you like. The SMS app pushes a view controller to display the contact info using a navigation controller.
If this still doesn't solve your problem, you're going to have to post some code in order to get more insight into what's going wrong.