Excuse the bad pun, I'm creating a custom tab bar in my iPhone app using UIButtons. Everything works beautifully except that when I tap and hold a button, it doesn't select it until I release it. It's really bugging me, because a standard UITabBarItem is selected on touch down and it just feels wrong.
I've set the IBAction to "Touch Down" and my code is pretty simple. Am I doing something wrong?
-(IBAction)tab1Pressed:(id)sender
{
if (self.tab1.selected == NO) {
self.tab1.selected = YES;
self.tab2.selected = NO;
}
}
Got a solution! Added a UILongPressGestureRecognizer to each UIButton, instead of using IBActions. Worked like a charm!
In viewDidLoad:
tapAndHold = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:#selector(handleTapAndHold)];
[tapAndHold setMinimumPressDuration:0.01];
[self.myTabBarButton addGestureRecognizer:tapAndHold];
[tapAndHold release];
You should use another event for your button. The default one is "touch up inside". The action is triggered when you release the button.
Using "touch down" should do what you want.
You can try subclassing a UIView and implementing touchesBegan:withEvent: method.
Related
I'd like to disable UITextField's keyboard without hidding.
is it possible?
If it's so, could you show me how to do?
thanx
Carsh
if you implement delegate method of uitextfield
- (BOOL)textFieldShouldBeginEditing:(UITextField *)textField
{
return NO;
}
It does not show the keyboard.
I don't believe the UIKeyboard can be disabled without hiding it.
If you'd like to disable user interaction with the keyboard, you could add an extra UIWindow on top of your existing windows.
By overlaying the UIKeyboard with a transparent UIWindow, the user would be able to see the keyboard, without interacting with it.
a haha , i have a very very ugly method. you can creat a view whichs frame = the keyboards frame. [view setBackgroundColor:[UIColor clearColor]]; [self addSubviews:view];
I did not try but this should work:
textField.inputView.userInteractionEnabled = NO;
I've been using a UITapGestureRecognizer for quite some time now to take notice when a tap occurs and to display another view. I'm initializing it like this:
_tapGestureRecognizer = [[UITapGestureRecognizer alloc] initWithTarget:self action:#selector(showModalDetailView:)];
In iOS 4.3, that did work perfectly. In iOS 5, -showModalDetailView: does not get called anymore.
I was wondering if anyone else has this issue, too?
Update
I'm configuring the recognizer like this:
_tapGesture = [[UITapGestureRecognizer alloc] initWithTarget:self action:#selector(showModalDetailView:)];
_tapGesture.numberOfTapsRequired = 1;
_tapGesture.numberOfTouchesRequired = 1;
_tapGesture.delegate = self;
[self addGestureRecognizer:_tapGesture];
Update 2
Ok, now it gets weird. The code starts working again once I disable the delegate setting by commenting it. However, the delegate methods are still being called. But not always.
The cell has a left aligned title and a right aligned detail text. When you hit the detail text it works as expected: The delegate method does not get called and the popover appears. When you hit the cell somewhere else, the delegate method (-gestureRecognizer:shouldReceiveTouch: in this case) gets called and the popover appears.
I don't quite get what's going on here.
Now that I implement all three delegate methods (though they're optional) it works. Just returning the default values. Thanks, Dunkelstern and thomas.
Try setting numberOfTouchesRequired and numberOfTapsRequired to 1 explicitly.
And of course you have to call addGestureRecognizer on your View instance.
How can i use image to Perform an Action instead of Using Button or adding an image to Button, just wanna click button and perform particular set of instructions.
(Thanks in Advance)
Use a UIGestureRecogniser.
// IF your image view is called myImage
UIImageView *myImage = ...;
// Add a tap gesture recogniser
UITapGestureRecogniser *g = [[UITapGestureRecogniser alloc] initWithTarget:self action:#selector(imagePressed:)];
[myImage addGestureRecogniser:g];
[g release];
When your image is tapped, this method will get called
- (void)imagePressed:(UIGestureRecogniser *)recogniser {
NSLog(#"%#", recogniser);
}
Why don't you want to use a UIButton - it inherits from UIControl and has a lot of code that you probably don't even know exists? And it can just contain an image so it would look exactly the same?
Well, the pro about using UIButtons is that it got all touch events built right in. You can use UIImageViews, but you'll need to subclass them, while in most situations, a UIButton using a background-image would just fit.
I am trying to have some controls appear when you push a button and have it disappear when you press a different button. Right now the HUD is comprised of an image view, and some custom buttons in a UIView called "credits". I've managed to have it disappear using:
[credits removeFromSuperview];
How do I have it reappear?
If it's just a UIImageView, you should...
[self.view addSubview:credits];
... assuming you've not released it already. On a side note, there is a really good HUD for iOS here: http://github.com/matej/MBProgressHUD
I believe you can just set the view to be hidden
[self.view setHidden:YES];
While it's hidden, you can also update the view and then show again
[self.view setHidden:NO];
You'd better set their hidden property to whether YES or NO
This method will toggle the UIView credits hidden property
- (void) toggleCredits {
[credits setHidden:![credits isHidden]];
}
I need to add an action button in my iPhone application. When that one is clicked the UIActionSheet with buttons need to be popped up.
Can any one tell me how to add an action button? - means is there any in built action button for iPhone app? or do we need to create a new button with image?
Thanks in advance!
Assuming this is in a view controller, you can do something like:
- (void)viewDidLoad
{
UIBarButtonItem *actionButton = [[UIBarButtonItem alloc]
initWithBarButtonSystemItem:UIBarButtonSystemItemAction
target:self
action:#selector(methodThatShowsSheet)];
self.navigationItem.rightBarButtonItem = actionButton;
[actionButton release];
}
(Pardon the weird indentation to make it fit in a reasonable width (I normally just let Xcode wrap-indent everything automatically)).
See Nick Veys' answer for how to implement methodThatShowsSheet.
You need to hook up the action from the button you've decided will present this action sheet to code that shows it.
See the Apple Documentation on UIActionSheet for help on doing that.
I'm not sure I understnd your question but UIKit includes the UIButton class which will automatically send a message (specified by you) to an object (also specified by you). You can create a UIButton i nInterface builder or programatically.
Without more details on whay you actually want to do or why you're finding it difficult,m it's difficult to be more precise.