How to properly animate datePicker appearance/disappearance in stackView? Currently I tried like this:
UIView.animateWithDuration(0.3, animations: {
self.datePickerView.hidden = !self.datePickerView.hidden
})
This causes problems with hiding animation - it starts nicely and then in the end datePickerView flashes a little bit at the top of where datePicker was. Any suggestions?
I had the same issue and solved it this way:
Put your Picker in a view (we will call it pickerContainerView)
Set a 216 height constraint to your pickerContainerView (picker default height)
Set the constraint priority to 999 to quiet "UISV-hiding" constraint warning
Add "leading", "trailing" and "center vertically" constraints from your picker to the pickerContainerView
animate hide of the pickerContainerView :
Swift 2
UIView.animateWithDuration(0.3, animations: {
self.pickerContainerView.hidden = !self.pickerContainerView.hidden
})
Swift 3, 4, 5
UIView.animate(withDuration: 0.3, animations: {
self.pickerContainerView.isHidden = !self.pickerContainerView.isHidden
})
Using a container to hold the picker and setting clipsToBounds = true worked for me.
I'm using PureLayout, but it should work with IB too.
startRangePickerContainer = UIView()
startRangePickerContainer.clipsToBounds = true
startRangePickerContainer.backgroundColor = UIColor.cyan
stackView.addArrangedSubview(startRangePickerContainer)
startRangePickerContainer.autoPinEdge(toSuperviewEdge: .leading)
startRangePickerContainer.autoSetDimension(.height, toSize: 216)
startRangePickerContainer.autoPinEdge(toSuperviewEdge: .leading)
startRangePickerContainer.autoPinEdge(toSuperviewEdge: .trailing)
startRangePicker = UIDatePicker()
startRangePickerContainer.addSubview(startRangePicker)
startRangePicker.autoCenterInSuperview()
To animate:
UIView.animate(withDuration: 0.3, animations: {
self.startRangePickerContainer.isHidden = !self.startRangePickerContainer.isHidden
})
Related
Something special has to be done to animate a constraint instantiated programmatically?
I instantiate a constraint programmatically as a lazy variable:
private lazy var topConstraint: NSLayoutConstraint = {
let constraint = view.topAnchor.constraint(equalTo: otherView.topAnchor, constant: otherView)
return constraint
}()
Then, I animate a change in the constant of this constraint:
topConstraint.constant = newValue
view.setNeedsLayout()
UIView.animate(withDuration: 1) {
self.view.layoutIfNeeded()
}
It is not working... I also have tried putting the constant setting into the block:
UIView.animate(withDuration: 1) {
self.topConstraint.constant = newValue
self.view.setNeedsLayout()
self.view.layoutIfNeeded()
}
But I achieved nothing at all, I've tried almost all the combinations. The constraint constant is properly changed, but always without animation.
PD: I also gave a shot to UIViewPropertyAnimator.
No need for setNeedsLayout().
self.topConstraint.constant = 0.0
UIView.animate(withDuration: 1.0) {[weak self] in
self?.topConstraint.constant = 10.0
self?.view.layoutIfNeeded()
}
I setup an animation to hide one switch/label when another one is turned on. Simultaneously the switch that was just turned on move up. This works great with the simple explanation here.
However, when I try to move the switch/label back down after it is turned off it doesn't budge. The other switch reappears fine, but the top constraint change doesn't fire.
I'm relatively new to doing this type of setup and animating all programmatically and after spending an hour on this I'm stumped. Is it because I'm animating a top constraint relative to another one? How does that matter if it works the first time around? Even though the alpha of the hidden switch is set to zero, its frame is still there, right? Or am I doing something simple stupidly?
// Works Perfectly!
func hideVeg() {
self.view.layoutIfNeeded()
UIView.animate(withDuration: 1, delay: 0, options: [.curveEaseIn], animations: {
self.vegetarianSwitch.alpha = 0
self.vegetarianLabel.alpha = 0
self.veganSwitch.topAnchor.constraint(equalTo: self.vegetarianSwitch.bottomAnchor, constant: -30).isActive = true
self.view.layoutIfNeeded()
})
}
// Showing the label and switch works, but the topAnchor constraint never changes!
func showVeg() {
self.view.layoutIfNeeded()
UIView.animate(withDuration: 1, delay: 0, options: [.curveEaseIn], animations: {
self.vegetarianSwitch.alpha = 1
self.vegetarianLabel.alpha = 1
// This is the constraint that doesn't change.
// This is exactly what it was set to before the other hideVeg() runs.
self.veganSwitch.topAnchor.constraint(equalTo: self.vegetarianSwitch.bottomAnchor, constant: 40).isActive = true
self.view.layoutIfNeeded()
})
}
The issue here is that you are not modifying the constraints but actually creating new constraints with each animation. What you want to do instead is just create the constraint once (you can do it in code or in Interface Builder and drag and outlet). You can then just change the .constant field of the existing constraint in your animation block.
The constant needs to be changed with the animation, not creating an entirely new constraint. The old constraint still exists causing the issue.
var veganTopConstraint = NSLayoutConstraint()
// Top Constraint set up this way so it can be animated later.
veganTopConstraint = veganSwitch.topAnchor.constraint(equalTo: vegetarianSwitch.bottomAnchor, constant: 40)
veganTopConstraint.isActive = true
func hideVeg() {
UIView.animate(withDuration: 1, delay: 0, options: [.curveEaseIn], animations: {
self.vegetarianSwitch.alpha = 0
self.vegetarianLabel.alpha = 0
self.veganTopConstraint.constant = -30
self.view.layoutIfNeeded()
})
}
func showVeg() {
self.view.layoutIfNeeded()
UIView.animate(withDuration: 1, delay: 0, options: [.curveEaseIn], animations: {
self.vegetarianSwitch.alpha = 1
self.vegetarianLabel.alpha = 1
self.veganTopConstraint.constant = 40
self.view.layoutIfNeeded()
})
}
I have a weird problem that seems to be fairly easy to solve. I think I could use some workaround to be able to have the behavior that I want but I want to know if there is a better way to do it.
I have a view called contentView (blue in the image) that it will expand its height using a UIView.animation, this is no problem at all and works as expected.
The problem here is that this view has a child component (a button) that has an autolayout constraint to its bottom equal to 22 like this:
This is the autolayout constraint:
If I do the height resize without the animation it works fine, the view height change and the button are always 22 points of the bottom of the contentView. But when I use an animation to make this change more smoothy and user-friendly the button moves to the end position before the animation even start.
I want to know how I could achieve a smooth animation here but with the button moving along its parent view
The part of the code that handles the animation is pretty straightforward but I'll post it in here:
#IBAction func openDetail(_ sender: ExpandCourseDetail) {
let rotation = sender.getOpen() ? CGAffineTransform.identity : CGAffineTransform(rotationAngle: CGFloat.pi)
UIView.animate(withDuration: 0.5, delay: 0.1, options: [.curveEaseInOut], animations: {
sender.transform = rotation
}, completion: {
success in
sender.setOpen(!sender.getOpen())
})
UIView.animate(withDuration: 1.0, delay: 0.5, options: [.curveEaseInOut], animations: {
self.contentView.frame.size.height = sender.getOpen() ? self.contentView.frame.height - 300 : self.contentView.frame.height + 300
}, completion: nil)
}
As a side note, the button itself has an animation that rotates the button 180 degrees to show the user that the view is expanding.
Thank you so much for your help.
It's super easy with constraints, just create a superView height constraint IBOutlet and change its constant value.
#IBAction func btnPressed(_ sender: UIButton) {
self.toggleButton.isSelected = !sender.isSelected
//Animation starts here
self.view.layoutIfNeeded()
UIView.animate(withDuration: 0.7) {
if self.toggleButton.isSelected {
//transform button
self.toggleButton.transform = CGAffineTransform(rotationAngle: CGFloat(Double.pi))
//change your ParentView height to desired one
self.constContentViewHeight.constant = self.view.frame.size.height - 220
self.view.layoutIfNeeded()
} else {
self.toggleButton.transform = CGAffineTransform(rotationAngle: CGFloat(Double.pi*2))
// Set height constraint to original value
self.constContentViewHeight.constant = 250
self.view.layoutIfNeeded()
}
}
}
I have created a demo, check it out.
The issue you are facing is due to two animation blocks. So I have changed some lines and put both button transformation and height animation into one animation block.
func openDetail(_ sender: ExpandCourseDetail) {
let isOpen = sender.getOpen() ? CGAffineTransform.identity : CGAffineTransform(rotationAngle: CGFloat.pi)
UIView.animate(withDuration: 1.0, delay: 0.5, options: [.curveEaseInOut], animations: {
sender.transform = rotation
self.contentView.frame.size.height = self.contentView.frame.height + (isOpen ? 300 : -300)
}, completion: { (success) in
sender.setOpen(!isOpen)
})
}
I have a problem with the animation of a view after changing it's height constraint. In the screenshot, you can see it's initial value of 120.0.
The animation works but the constraint update from my second view (the blue one) happens directly and not during the animation. This means that second view jumps to the top directly.
With the following code, I will animate the change of the height constraint:
UIView.animate(withDuration: 3.0, animations: {
self.heightConstraint?.constant = 0.0
self.myLabel.alpha = 0.0
self.layoutIfNeeded()
})
Does anybody know why?
self.heightConstraint?.constant = 0.0
self.myLabel.alpha = 0.0
UIView.animate(withDuration: 3.0, animations: {
self.layoutIfNeeded()
})
It should be like this.
For animating constraint changes, you need to write code like below to work.
self.heightConstraint?.constant = 0.0
self.myLabel.alpha = 0.0
UIView.animate(withDuration: 5) {
self.layoutIfNeeded()
}
You need to call self.layoutIfNeeded() before and after updating constraint constant. Change your code to :
self.layoutIfNeeded()
UIView.animate(withDuration: 3.0, animations: {
self.heightConstraint?.constant = 0.0
self.myLabel.alpha = 0.0
self.layoutIfNeeded()
})
I have view sView inside my ViewController. It height has constraint - I created IBOutlet for this constraint - sViewHeightConstraint. I want to decrease height of sView with animation.
I created function
UIView.animateWithDuration(5.5, animations: {
self.sViewHeightConstraint.constant = 50
})
Height of view is changing but i don't see any animation. What I am doing wrong?
use layoutIfNeeded()
view.layoutIfNeeded() // force any pending operations to finish
UIView.animateWithDuration(0.2, animations: { () -> Void in
self.sViewHeightConstraint.constant = 50
self.view.layoutIfNeeded()
})
swift 3
view.layoutIfNeeded()
sViewHeightConstraint.constant = 50
UIView.animate(withDuration: 1.0, animations: {
self.view.layoutIfNeeded()
})
In case your view updates but animation isn't working, this solution works for me.
UIView.animate(withDuration: 0.2, animations: {
self.sViewHeightConstraint.constant = 50
self.sView.size = CGSize(width: self.sView.frame.width, height: 50)
self.view.layoutIfNeeded()
})