I have a smaller UIButton which is on top of a larger UIButton.
The problem right now is that if I tap the smaller UIButton, it also will trigger the larger UIButton. The code I'm using to determine if the buttons were tapped is:
if(CGRectContainsPoint(button1.frame, location)) {
}
Is there a property of the buttons or some automated way to make the smaller button not effect the larger button?
I know I could alter the code above to say if its within button1's frame and not within button2, but is there another way to do it?
UIControl (which is the superclass of UIButton) passes itself as the only parameter to its target using the action selector. Make use it, it's there for exactly these cases!
[smallButton addTarget:self action:#selector(doStuff:) forControlEvents:UIControlEventTouchUpInside];
[bigButton addTarget:self action:#selector(doStuff:) forControlEvents:UIControlEventTouchUpInside];
// ...
- (void) doStuff:(UIButton *)btn
{
if (btn == smallButton)
{
// smaller button was clicked
}
else
{
// bigger button was clicked
}
}
Related
I want to add a sound to every button sub-view in my UIView. I have so many of these buttons so I dont want to make a category or subclass of UIButton because in that case I have to change class name everywhere.
Is there anyway that I just loop [currentView subViews] and get button one by one, and add an action method.
Please keep in mind that buttons already have actions as well. So i am in search of some way to add definition to that action selectors.
try something like below...its not tested but should work...
for(UIButton *button in currentView.subViews) {
if ([button isKindOfClass:[UIButton class]]) {
[button addTarget:self
action:#selector(playSound)
forControlEvents:UIControlEventTouchUpInside];
}
}
I have a tableview that contains a row with a custom cell that contains a UIButton. However, the button doesn't always fire the action. Here's my code:
submitButton = [[UIButton alloc] init];
[[submitButton layer] setBorderColor:[[UIColor whiteColor] CGColor]];
[submitButton setClipsToBounds: YES];
submitButton.backgroundColor = [UIColor grayColor];
[submitButton setTitle:#"Send" forState:UIControlStateNormal];
[self.contentView addSubview:submitButton];
[submitButton addTarget:self action:#selector(buttonAction) forControlEvents:UIControlEventTouchUpInside];
[submitButton release];
This is called in the custom cell's -(id)initWithStyle:
The buttonAction method looks like this:
-(void)buttonAction
{
NSLog(#"Button Clicked!");
}
It seems that the only way I can get the buttonAction to fire is if I press down on the button and release somewhere inside the cell's frame, but not inside the button itself. Why would that be?
*UPDATE*
Problem still exists, but I found that the more consistent way to get the button to fire is to click and drag to the left or right and then let go, as long as I let go within the bounds of the cell/row.
UPDATE #2
It looks like if I use iOS 6.0, it works as intended. But on 5.0 or 5.1 it does not.
Try assigning the same method call to TouchUpOutside as well - you should then see it work every time. TouchUpInside is only fired if you lift your finger while still within the bounds of the button.
Try [submitButton sizeToFit]. I'm wondering whether your button has any size (since I don't see you giving it any).
Also: Create your button with [UIButton buttonWithType: UIButtonTypeCustom] instead of alloc-init.
I need to implement a grid view of images that requires each segment to segue to another view controller /or View.
My parameters:
I need 260 segments: approx 18px x 18px
Each segment will be numbered (1-260) and have a diffrent (background) image
One segment must be highlighted (a daily square like ical)
You can tap any segment to segue to the next view controller
I have looked at custom TVCells / Buttons but are there more options out there?
Thank you
In the end I opted for:
Linking the 1stViewController to the 2ndViewController in the
storyboard and naming the seque.identifier in the attributes.
Creating a grid of UIButtons in IB and assigning them individual tags in the attributes (1-260 - don't use 0 as it is a default).
To change the buttons' backgroundImage daily I set up a day-counter integer
and in the viewDidLoad of the 1stVC coded:
[(UIButton*)[self.view viewWithTag:dayCount] setBackgroundImage:[UIImage imageNamed:#"image_Day.png"] forState:UIControlStateNormal];
As there were multiple UIButtons, I decided that dragging them all to a IBAction in IB was too long a task so I assinged them programatically using:
-(void) assignButtons{
[(UIButton*)[self.view viewWithTag:1] addTarget:self action:#selector(buttonClicked:) forControlEvents:UIControlEventTouchUpInside];
[(UIButton*)[self.view viewWithTag:2] addTarget:self action:#selector(buttonClicked:) forControlEvents:UIControlEventTouchUpInside];
} //etc for all 260
Then used performSegueWithIdentifier: in a method:
-(IBAction) buttonClicked:(id)sender{
[self performSegueWithIdentifier:#"mySegue" sender:self];
}
I am having trouble with the behavior of one of my UIButtons. I am trying to essentially make it a toggle button, but I am running into the problem below.
I have the code:
UIButton *likeButton = [[UIButton alloc] initWithFrame:CGRectMake(horizontalOffset+buttonWidth, verticalOffset, buttonWidth, buttonHeight)];
[likeButton setImage:[UIImage imageNamed:#"like-off.png"] forState:UIControlStateNormal];
[likeButton setImage:[UIImage imageNamed:#"like-on.png"] forState:UIControlStateHighlighted];
[likeButton setImage:[UIImage imageNamed:#"like-on.png"] forState:UIControlStateSelected];
[likeButton addTarget:self action:#selector(likeButtonPressed:) forControlEvents:UIControlEventTouchUpInside];
which fires the method:
-(void)likeButtonPressed:(id)sender {
UIButton *button = (UIButton *)sender;
[button setSelected:!button.selected];
}
The behavior I am seeing is that when I tap the button down (and highlight it), it works as expected, and the 'like-on.png' image is used for the highlighted state, and it remains on in the 'selected' state.
However, when I tap the button again, to toggle it off, I see a gray highlighted state when I press my finger. When I release my finger, I see the 'like-off' image is shown as expected.
I would like to avoid seeing the gray highlighted state when I press my finger down on the button when I go to toggle it off. Instead I would like to make sure that the highlighted state on toggle-off uses the 'like-on.png' image as specified in the code.
What's going on here? Any ideas where my code could be incorrect?
Many thanks,
Brett
You're missing the image for the selected and highlighted state:
[likeButton setImage:[UIImage imageNamed:#"like-on.png"] forState:UIControlStateSelected | UIControlStateHighlighted];
If you don't set it, the image of the normal state is used. From the -[UIButton setImage:forState:] documentation:
In general, if a property is not specified for a state, the default is to use the UIControlStateNormal value.
If you don't want your images to be modified when they are highlighted, set:
likeButton.adjustsImageWhenHighlighted = NO;
I think the selected property of UIButton is meant for something different (think of the desktop UI).
It would be more consistent to change the for all states according to a BOOL that tracks if it is "on" or "off".
Thus,
-(void)likeButtonPressed:(id)sender {
UIButton *button = (UIButton *) sender;
liking = !liking;
if (liking) {
// configure the four states with "like-on" and other images
}
else {
// configure the four states with "like-off"
}
}
Otherwise you would use the state of a UI element to represent your program logic, which is basically flawed. The only instance where this is sort of acceptable (but not really) is a UISwitch.
I'm trying to add a UIButton to a UIView, but am having some trouble with getting it to respond to touches.
I have a method which returns UIButtons after I provide it with a tag:
- (UIButton*)niceSizeButtonWithTag:(int)tag {
UIButton * aButton = [UIButton buttonWithType:UIButtonTypeCustom];
[aButton setTag:tag];
[aButton addTarget:self action:#selector(buttonWasTapped:) forControlEvents:UIControlEventTouchUpInside];
CGRect newFrame = aButton.frame;
newFrame.size.width = 44;
newFrame.size.height = 44;
[aButton setFrame:newFrame];
return aButton;
}
As you can see I'm creating a new button and increasing the size.
I use this in the following way:
UIButton * anotherButton = [self niceSizeButtonWithTag:1];
[anotherButton setImage:[UIImage imageNamed:#"image" withExtension:#"png"] forState:UIControlStateNormal];
[anotherButton setCenter:CGPointMake(middleOfView)];
[aView addSubview:anotherButton];
I create a lot of buttons like this, hence the reason for the method.
The buttons are always created and added to the subview perfectly. I can see the image and they're in the correct position. The problem is that they only respond to touches in a tiny strip.
In this attached image,
alt text http://web1.twitpic.com/img/107755085-5bffdcb66beb6674d01bb951094b0e55.4c017948-full.png
The yellow shows the whole frame of the button,
The red shows the area that will respond to touches.
The grey shows a section of the view the button is added to.
If anyone could shed some light on why this is happening, it would be really useful.
UPDATE:
I should probably mention I'm trying to add this button to a UIView which is a subview of a UITableViewCell.
UPDATE 2:
Adding it directly to the UITableViewCell works, adding it to the UIView on the UITableViewCell is causing the error.
FINAL UPDATE
The problem turned out to be that I was sending the view containing the button to the back of the subviews on the UITableViewCell. Getting rid of the sendSubviewToBack: call fixed it.
Do you have any other views added to this containing view after you add the button? try setting some of your view's background color to blueColor, redColor and other colors to better see what the stack of views in your app is like. Then you should be easily able to see if there is some sort of view blocking the button.