I have a custom UIControl that passes UIControlEventValueChanged events back to my ViewController. I also need to animate it (basic resizing) in certain circumstances, but UIControl seems to have no implementation of beginAnimations or commitAnimations. Do I have to encase it in a UIView? Any better solution? Thanks.
A UIControl is a UIView so you can just use the standard UIView calls.
[UIView beginAnimations:nil context:nil];
[yourControl setFrame:theNewFrame];
[UIView commitAnimations];
Related
I have a view controller which is assigned as a rootViewController like below :
self.viewCntrl = [[ViewController alloc]initWithNibName:#"ViewController" bundle:nil];
self.window.rootViewController = self.viewCntrl;
And in the same view controller i have a button and i am performing transition animation on button click like this:
[UIView setAnimationTransition:UIViewAnimationTransitionCurlUp forView:self.view.superview cache:YES];
but it not works when i write like this:
[UIView setAnimationTransition:UIViewAnimationTransitionCurlUp forView:self.view cache:YES];
As here self is a ViewController's object, the ViewController which is nothing but assigned to self.window.rootViewController. So why it takes self.view.superview instead of self.view to animate?
Depending on the kind of animation you are trying to execute, possibly the answer is here:
If you want to change the appearance of a view during a transition—for example, flip from one view to another—then use a container view, an instance of UIView, as follows:
Begin an animation block.
Set the transition on the container view.
Remove the subview from the container view.
Add the new subview to the container view.
Commit the animation block.
Is there a way for a UITextField to become first responder without the animation of the keyboard? That is, make it such that the keyboard just appears?
Basically, I'm pushing a second UIViewController over the UIViewController that has the UITextField, and when that second view controller gets popped off the stack, I want the UITextField to immediately have first responder status so that when the second view controller gets popped, the user never notices the text field wasn't first responder.
Right now I have it so that when it's popped, the keyboard animates up the screen, but I don't want that to be seen.
Any ideas?
You can use a UIView animation like so
[UIView beginAnimations:nil context:nil];
[UIView setAnimationDuration:0.0];
[UIView setAnimationDelay:0.0];
[UIView setAnimationCurve:UIViewAnimationCurveLinear];
[textField becomeFirstResponder]; // <---- Only edit this line
[UIView commitAnimations];
This will cause the keyboard to suddenly appear.
You can do the same but with -resignFirstResponder
Swift ..
UIView.beginAnimations(nil, context: nil)
UIView.setAnimationDuration(0.0)
UIView.setAnimationDelay(0.0)
someTextView.resignFirstResponder()
UIView.commitAnimations()
Just set it as the first responder in -viewDidAppear to make the user never notice the field having lost its status.
-(void)viewWillAppear:(BOOL)animated {
if ([self isViewLoaded] && self.textField)
[self.textField becomeFirstResponder];
[super viewWillAppear:animated];
}
I've put a short sample project up on dropbox using this code, if you'd like it.
I'm, mot sure what iOS version do you use or at what point do you call becomeFirstResponder
Calling [textFieldReference becomeFirstResponder] in viewWillAppear: for iOS5/iOS6 seems to work just the way you wanted it to:
it's being called just before view controller will show it's view (that's if you don't handle view controller hierarchy manually) and as soon as it appears in navigation controller keyboard is already presented and text field has focus.
That said, there is no public way that I heard off that would allow to specify keyboard appearance style.
I don't think this was an option when the question was first asked, but UIView.performWithoutAnimation works appropriately.
UIView.performWithoutAnimation {
self.composeView.focusTextField()
}
I Have a UIViewController 1 on it UIButton (added as subview), after I pressed Button (see pic.1 below) on it adding another UIViewController 2 with animation from the bottom to top after some action:
[[[UIApplication sharedApplication] keyWindow] addSubview:self.view];
And it overlaps UIButton, how can I add this subview that it does not cover UIButton(see pic.2 below)
pic.1:
pic. 2:
You haven't shown the animation code but I assume you add the subview off-screen, then change it's frame (animated) to slide it into view.
Add the new subview using insertSubview:belowSubview: instead, passing your button as the second argument. This way the button will overlap the new view, instead of the other way round. addSubview: always puts the new view on top of any others.
EDIT
From your comments it seems that you're adding the second view controller to the screen using presentModalViewController: so the above method won't work. As far as I know there is no way to keep an element from the original view controller on top of the new view controller's view if you are presenting it this way.
You may have to create a new UIWindow and set it's windowLevel to UIWindowLevelAlert to hold your button. This will keep it on top of any of the views underneath. Add this window as a subview to the main window.
{
SecondViewController *objComing=[[SecondViewController alloc] init];
[self.view addSubview:objComing.view];
objComing.view.backgroundColor=[UIColor blueColor];
objComing.view.frame=CGRectMake(0,420, 320, 0);
[UIView beginAnimations:nil context:nil];
[UIView setAnimationDuration:0.5];
[UIView setAnimationCurve:UIViewAnimationCurveEaseIn];
objComing.view.frame=CGRectMake(0,0, 320, 420);
[UIView commitAnimations];
}
Put this code in the button action and replace secondViewController with your ViewController.
How can I add a drag event to a subview of a UIScrollView? The structure is the following:
-UIView
-UIScrollView
-UIView
-UIView
...
I tried to start with the following:
-(void) touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {
UITouch *aTouch = [touches anyObject];
CGPoint location = [aTouch locationInView:self.superview.superview];
[UIView beginAnimations:#"Dragging A DraggableView" context:nil];
self.frame = CGRectMake(location.x, location.y,
self.frame.size.width, self.frame.size.height);
[UIView commitAnimations];
}
But nothing happens! Help would be very much appreciated.
Thanks
Just incase anyone finds this question like I did, I solved this problem by adding a gesture recognizer to the subviews in the scrollview. The gesture recognizer will handle the touch event itself.
Bruno, one possibility is to use the gesture recognizers, as Scott mentions.
Another possibility is to use the touchesMoved: method you mention. Using the touchesMoved: method requires you to implement another three methods, touchesBegan:, touchesEnded:, touchesCancelled:. They cover the phases of the finger touching the screen:
First contact (touchesBegan) allows you to set up variables as needed.
Continuous move (touchesMoved) allows you to track the move and move your content continuously.
And finally removing the finger (touchesEnded) where you can finalize any changes you want to keep.
touchesCancelled is required for clean-up if the gesture is interrupted (by phone call, or some other controller grabbing the touch event).
You need all four methods on the same class, otherwise a superclass implementing the method will grab the touch processing and your code won't run as expected.
Regards, nobi
Im trying to add a subview, and then also remove the previous view.
here is what my code looks like:
HowToPlay *LetsPlay = [[HowToPlay alloc] initWithNibName:#"HowToPlay" bundle:nil];
[UIView beginAnimations:nil context:nil];
[UIView setAnimationDuration:0.75];
[UIView setAnimationTransition:UIViewAnimationTransitionFlipFromRight
forView:[self view]
cache:YES];
[UIView commitAnimations];
MainViewController *ma = [[MainViewController alloc]init];
[ma.view removeFromSuperview];
[self.view addSubview:LetsPlay.view];
The Mainviewcontroller is the view that its currently on. I want it to dismiss that view, then go ahead and add the new view LetsPlay.
This code runs, and it loads a new view, but when i then load another view from LetsPlay i can see that the mainviewcontroller is still running behind it. I want to permanently dismiss it.
Also im not even sure if im going about this correctly, so if im not could you please give me an example of how to do it correctly.
Thanks :)
You're not going at it the right way: you're creating a new instance of MainViewController (and also of its associated view). You're then attempting to remove this newly created view (call it instance2) from its superview while it hasn't even been added to a view (instance1 has). This is why you're still seeing mainviewcontroller.
Instead, you need to get a hold of the currently running/active MainViewController. I.e. you should be holding on to a reference of that view controller. Then you can call removeFromSuperview on its view.
Hope this helps.