How do I set this UIScrollView to focus on the Selected UITextfield at specific points. I want the textfield right above the keyboard and I want to be able to scroll up but not down. My code works except for uiscrollview only lets me scroll down and not up. Any help would be great, thanks.
- (void)textFieldDidBeginEditing:(UITextField *)textField
{
[UIView beginAnimations:nil context:NULL];
[UIView setAnimationDuration:0.4];
//set Y according to keyBoard height
[self->mainScroll2 setFrame:CGRectMake(0.0,-70.0,320.0,580.0)];
[self->mainScroll2 setContentSize:CGSizeMake(320,780)];
[UIView commitAnimations];
}
As my understanding of your case, you have a UITextfield in the UIScrollView, right?
If this is the case, I recommend you use the property contentInset of UIScrollVIew to "scroll up
For example:
float yourKeyboardHeight = 70.0;//since you are trying to change the scrollview's y to -70
self.mainScroll2.contentInset = UIEdgeInsetsMake(0,0,yourKeyboardHeight,0);
This tells the UIScrollView to create a placeholder behind the contentView. In this code, there are four arguments for the property, it's like UIEdgeInsetsMake(top, left, bottom, right) I just added a bottom inset to the view so that makes the content move up 70.0
Hope this may help
Related
I am currently trying to make a UIView containing some UILabel animate to a new size. But doing so I am having some trouble understanding what is really happening with my view. I read some other post about it but I am still unclear about what is really going on.
In my button I added something that just double the size of the right constraint :
[superView layoutIfNeeded];
rightConst.constant *= 2;
[UIView animateWithDuration:3
animations:^{
[superView layoutIfNeeded];
} completion:nil];
superView Being the view I wanna animate and rightConst the constraint to the right.
But doing so, the animation starts but it is actually coming from left. I don't understand this part. My goal would be to animate just the right side of the view to show the resize and maybe the bottom part of the view but the top left should be fixed.
Thanks.
As described in this document, if you call [aView layoutSubviews], layout of the subviews of aView is forced but layout of aView itself is NOT forced.
You need to call layoutSubviews of the superview of the view you want to animate. In this case, the superview of the superview of the two labels.
Solution is here
UIView *theView;
// theView is the superview of the superview of the two labels.
theView = superView.superview;
[theView layoutIfNeeded];
rightConst.constant *= 2;
[UIView animateWithDuration:3
animations:^{
[theView layoutIfNeeded];
} completion:nil];
I have a ViewController that is divided in 2 parts.
The top is a UIWebView
The bottom is a UITableView
Sometimes, there is no content required for the UITableView. So what I would like to do is have the UIWebView expand into the empty space the UITableView has relinquished.
I have Auto Layout Enabled with the following constraints:
The UIWebView is pinned to the top of the ViewController and the bottom of the UIWebView is pinned to the top of the UITableView
The UITableView is pinned to the bottom, with the top of the UITableView pinned to the bottom of the UIWebView.
When I set the hidden property of the UITableView to YES, it successfully hides the UITableView, but leaves a void where it once was, not expanding the UIVWebView.
What do you suggest?
Thanks
[EDIT]
The following code pushes down the tableView, but leaves a void behind it.
CGRect newFrame = tableView.frame;
newFrame.origin.y += 130;
[UIView beginAnimations:nil context:nil];
[UIView setAnimationDuration:0.5];
[UIView setAnimationCurve:UIViewAnimationCurveEaseOut];
[UIView setAnimationDelegate:self];
tableView.frame = newFrame;
[UIView commitAnimations];
I won't "pull" the above UIWebView, it also happens to hide the lower navigaiton bar.
Hiding a view does not change its size or constraints, so the result you get is expected. You should probably have a height constraint on your table view, and make an IBOutlet to it. When there is no content in the table, modify the constant property of the constraint to make it 0.
self.tableHeightConstraint.constant = 0;
When there is content, you can calculate the height you need for the table view, and set the constant to that value, or some maximum value that you don't want to go beyond.
Keep the constraints same as you given with addition to that -
Instead of hiding UITableView , remove it from superview and pinned bottom of UIWebView to bottom with low priority constraints so that when you remove UITableview this low priority constraints will work and it will expand your UIWebView.
I have a view that automatically adjusts it's height based on number of lines in a UILabel within the view. There is another view which height is pinned to be equal to the view with the label.
I would like to animate the height change caused by setting long text to the label, thus changing the number of lines and causing autolayout constraints to recalculate height. This new height will change the height of the second view too. How can I animate autolayout changes that happen as a side effect of property assignment?
I tried this, but it did not work:
[UIView animateWithDuration:0.3 animations:^{
//I want the side effect of this assignment to be animated
self.viewWithLabel.title = #"This long title will change the view height and cause layout change";
}];
See the documentation
Try:
- (void)viewDidAppear:(BOOL)animated {
[self.view layoutIfNeeded];
[UIView animateWithDuration:1.0 animations:^{
self.viewWithLabel.title = #"This long title will change the view height and cause layout change";
[self.view layoutIfNeeded];
}];
}
I think you want yourTextLabel.clipToBounds = YES also.
If you want more advanced effect, see this question.
When I add some animations on the subview of the scrollview that like extending or contract a textfield,it just not work. But it worked well when the subview add to a simple UIView.
How did it happen?
There should be no problem animating the frame of a UITextField within a UIScrollView.
The most common source of "my animation isn't animating" in iOS 6 and later is the attempt to animate a control by adjusting the frame when employing autolayout (because the adjustment of the frame can be thwarted by the constraints being reapplied by the most innocuous of actions). You can tell if you're using autolayout or not by selecting the File Inspector (the first tab) of the rightmost panel in Interface Builder, and seeing if "Use Autolayout" is checked:
For example, to animate the frame when not using autolayout, assuming your UITextField has an IBOutlet called textField, you might do something like:
[UIView animateWithDuration:0.5 animations:^{
CGRect frame = self.textField.frame;
frame.size.width = 280;
self.textField.frame = frame;
}];
But the equivalent when using autolayout is not achieved by adjusting the frame, but rather by changing the constraints' constant values. For example, assuming you created an IBOutlet for the width constraint called textFieldWidthConstraint on your UITextField, you would animate the changing of the width with something like:
self.textFieldWidthConstraint.constant = 280;
[UIView animateWithDuration:0.5 animations:^{
[self.view layoutIfNeeded];
}];
If you believe you are using the appropriate animation technique that corresponds to your choice of autolayout or non-autolayout, but it's still not working, you should show us some code and describe the situation in greater detail.
I've never worked with autolayout constraints before. I have a small new app I'm working on and noticed that the NIB's views are defaulting to autolayout. So, I figured I'd take the opportunity to work with it and try to figure out where Apple is going with this.
First challenge:
I need to resize an MKMapView and I'd like to animate it to the new position. If I do this the way I'm used to:
[UIView animateWithDuration:1.2f
animations:^{
CGRect theFrame = worldView.frame;
CGRect newFrame = CGRectMake(theFrame.origin.x, theFrame.origin.y, theFrame.size.width, theFrame.size.height - 170);
worldView.frame = newFrame;
}];
...then the MKMapView will 'snap' back to its original height whenever a sibling view gets updated (in my case a UISegmentedControl's title is being updated [myUISegmentedControl setTitle:newTitle forSegmentAtIndex:0]).
So, what I think I want to do is change the constraints of the MKMapView from being equal to the parent view's hight to being relative to the top of the UISegmentedControl that it was covering: V:[MKMapView]-(16)-[UISegmentedControl]
What I want is for the MKMapView height to shorten so that some controls beneath the map view are revealed. To do so I think I need to change the constraint from a fixed full size view to one where the bottom is constrained to the top of a UISegmentedControl...and I'd like it to animate as view shrinks to new size.
How does one go about this?
Edit - this animation is not animating though the bottom of the view does move up 170 instantly:
[UIView animateWithDuration:1.2f
animations:^{
self.nibMapViewConstraint.constant = -170;
}];
and the nibMapViewConstraint is wired up in IB to the bottom Vertical Space constraint.
After updating your constraint:
[UIView animateWithDuration:0.5 animations:^{[self.view layoutIfNeeded];}];
Replace self.view with a reference to the containing view.
This works for me (Both iOS7 and iOS8+). Click on the auto layout constraint you would like to adjust (in interface builder e.g top constraint). Next make this an IBOutlet;
#property (strong, nonatomic) IBOutlet NSLayoutConstraint *topConstraint;
Animate upwards;
self.topConstraint.constant = -100;
[self.viewToAnimate setNeedsUpdateConstraints];
[UIView animateWithDuration:1.5 animations:^{
[self.viewToAnimate layoutIfNeeded];
}];
Animate back to original place
self.topConstraint.constant = 0;
[self.viewToAnimate setNeedsUpdateConstraints];
[UIView animateWithDuration:1.5 animations:^{
[self.viewToAnimate layoutIfNeeded];
}];
There is a very good tutorial from apple itself that explain how to use animation with autolayout.
Follow this link and then find the video named "Auto layout by example"
It gives some interesting stuff about autolayout and the last part is about how to use animation.
I have made this small demo available. It shows how auto-layout constraints can be changed and animated in a very simple example. Simply take a look at the DemoViewController.m.
Most people use autolayout to layout items on their views and modify the layout constrains to create animations.
An easy way to do this without a lot of code is creating the UIView you want to animate in Storyboard and then creating a hidden UIView where you want the UIView to end. You can use the preview in xcode to make sure both UIViews are where you want them to be. After that, hide the ending UIView and swap the layout constraints.
There is a podfile for swapping layout constrains called SBP if you don't want to write it yourself.
Here's a tutorial.
No need to use more IBOutlet reference of the constraint instead of this you can directly access or update already applied constraint either applied by Programmatically or from Interface Builder on any view using the KVConstraintExtensionsMaster library. This library is also managing the Cumulative behavior of NSLayoutConstraint.
To add Height Constraint on containerView
CGFloat height = 200;
[self.containerView applyHeightConstrain:height];
To update Height Constraint of containerView with animation
[self.containerView accessAppliedConstraintByAttribute:NSLayoutAttributeHeight completion:^(NSLayoutConstraint *expectedConstraint){
if (expectedConstraint) {
expectedConstraint.constant = 100;
/* for the animation */
[self.containerView updateModifyConstraintsWithAnimation:NULL];
}
}];