Ios 旋转事件发生时无法修复自动布局动画
不要害怕后面的庞大代码。您可以将代码段复制并粘贴到新的单视图应用程序中，以查看其行为。该问题位于与旋转动画一起执行的动画的完成块内的某个位置Ios 旋转事件发生时无法修复自动布局动画,ios,swift,animation,autolayout,Ios,Swift,Animation,Autolayout,不要害怕后面的庞大代码。您可以将代码段复制并粘贴到新的单视图应用程序中，以查看其行为。该问题位于与旋转动画一起执行的动画的完成块内的某个位置 import UIKit let sizeConstant: CGFloat = 60 class ViewController: UIViewController { let topView = UIView() let backgroundView = UIView() let stackView = UIStackVie
import UIKit
let sizeConstant: CGFloat = 60
class ViewController: UIViewController {
let topView = UIView()
let backgroundView = UIView()
let stackView = UIStackView()
let lLayoutGuide = UILayoutGuide()
let bLayoutGuide = UILayoutGuide()
var bottomConstraints = [NSLayoutConstraint]()
var leftConstraints = [NSLayoutConstraint]()
var bLayoutHeightConstraint: NSLayoutConstraint!
var lLayoutWidthConstraint: NSLayoutConstraint!
override func viewDidLoad() {
super.viewDidLoad()
print(UIScreen.main.bounds)
// self.view.layer.masksToBounds = true
let views = [
UIButton(type: .infoDark),
UIButton(type: .contactAdd),
UIButton(type: .detailDisclosure)
]
views.forEach(self.stackView.addArrangedSubview)
self.backgroundView.backgroundColor = UIColor.red
self.backgroundView.translatesAutoresizingMaskIntoConstraints = false
self.view.addSubview(self.backgroundView)
self.topView.backgroundColor = UIColor.green
self.topView.translatesAutoresizingMaskIntoConstraints = false
self.view.addSubview(self.topView)
self.stackView.axis = isPortrait() ? .horizontal : .vertical
self.stackView.distribution = .fillEqually
self.stackView.translatesAutoresizingMaskIntoConstraints = false
self.backgroundView.addSubview(self.stackView)
self.topView.topAnchor.constraint(equalTo: self.topLayoutGuide.bottomAnchor).isActive = true
self.topView.leadingAnchor.constraint(equalTo: self.view.leadingAnchor).isActive = true
self.topView.trailingAnchor.constraint(equalTo: self.view.trailingAnchor).isActive = true
self.topView.heightAnchor.constraint(equalToConstant: 46).isActive = true
self.view.addLayoutGuide(self.lLayoutGuide)
self.view.addLayoutGuide(self.bLayoutGuide)
self.bLayoutGuide.bottomAnchor.constraint(equalTo: self.view.bottomAnchor).isActive = true
self.bLayoutGuide.leadingAnchor.constraint(equalTo: self.view.leadingAnchor).isActive = true
self.bLayoutGuide.trailingAnchor.constraint(equalTo: self.view.trailingAnchor).isActive = true
self.bLayoutHeightConstraint = self.bLayoutGuide.heightAnchor.constraint(equalToConstant: isPortrait() ? sizeConstant : 0)
self.bLayoutHeightConstraint.isActive = true
self.lLayoutGuide.topAnchor.constraint(equalTo: self.topView.bottomAnchor).isActive = true
self.lLayoutGuide.bottomAnchor.constraint(equalTo: self.view.bottomAnchor).isActive = true
self.lLayoutGuide.leadingAnchor.constraint(equalTo: self.view.leadingAnchor).isActive = true
self.lLayoutWidthConstraint = self.lLayoutGuide.widthAnchor.constraint(equalToConstant: isPortrait() ? 0 : sizeConstant)
self.lLayoutWidthConstraint.isActive = true
self.stackView.topAnchor.constraint(equalTo: self.backgroundView.topAnchor).isActive = true
self.stackView.bottomAnchor.constraint(equalTo: self.backgroundView.bottomAnchor).isActive = true
self.stackView.leadingAnchor.constraint(equalTo: self.backgroundView.leadingAnchor).isActive = true
self.stackView.trailingAnchor.constraint(equalTo: self.backgroundView.trailingAnchor).isActive = true
self.bottomConstraints = [
self.backgroundView.topAnchor.constraint(equalTo: self.bLayoutGuide.topAnchor),
self.backgroundView.leadingAnchor.constraint(equalTo: self.bLayoutGuide.leadingAnchor),
self.backgroundView.trailingAnchor.constraint(equalTo: self.bLayoutGuide.trailingAnchor),
self.backgroundView.heightAnchor.constraint(equalToConstant: sizeConstant)
]
self.leftConstraints = [
self.backgroundView.topAnchor.constraint(equalTo: self.lLayoutGuide.topAnchor),
self.backgroundView.bottomAnchor.constraint(equalTo: self.lLayoutGuide.bottomAnchor),
self.backgroundView.trailingAnchor.constraint(equalTo: self.lLayoutGuide.trailingAnchor),
self.backgroundView.widthAnchor.constraint(equalToConstant: sizeConstant)
]
if isPortrait() {
NSLayoutConstraint.activate(self.bottomConstraints)
} else {
NSLayoutConstraint.activate(self.leftConstraints)
}
}
override func viewWillTransition(to size: CGSize, with coordinator: UIViewControllerTransitionCoordinator) {
let willBePortrait = size.width < size.height
coordinator.animate(alongsideTransition: {
context in
let halfDuration = context.transitionDuration / 2.0
UIView.animate(withDuration: halfDuration, delay: 0, options: .overrideInheritedDuration, animations: {
self.bLayoutHeightConstraint.constant = 0
self.lLayoutWidthConstraint.constant = 0
self.view.layoutIfNeeded()
}, completion: {
_ in
// HERE IS THE ISSUE!
// Putting this inside `performWithoutAnimation` did not helped
if willBePortrait {
self.stackView.axis = .horizontal
NSLayoutConstraint.deactivate(self.leftConstraints)
NSLayoutConstraint.activate(self.bottomConstraints)
} else {
self.stackView.axis = .vertical
NSLayoutConstraint.deactivate(self.bottomConstraints)
NSLayoutConstraint.activate(self.leftConstraints)
}
self.view.layoutIfNeeded()
UIView.animate(withDuration: halfDuration) {
if willBePortrait {
self.bLayoutHeightConstraint.constant = sizeConstant
} else {
self.lLayoutWidthConstraint.constant = sizeConstant
}
self.view.layoutIfNeeded()
}
})
})
super.viewWillTransition(to: size, with: coordinator)
}
func isPortrait() -> Bool {
let size = UIScreen.main.bounds.size
return size.width < size.height
}
}
导入UIKit
设sizeConstant:CGFloat=60
类ViewController:UIViewController{
让topView=UIView（）
让backgroundView=UIView（）
让stackView=UIStackView（）
让lLayoutGuide=UILayoutGuide（）
让bLayoutGuide=UILayoutGuide（）
var bottomConstraints=[NSLayoutConstraint]（）
var leftConstraints=[NSLayoutConstraint]（）
var bLayoutHeightConstraint:NSLayoutConstraint！
var lLayoutWidthConstraint:NSLayoutConstraint！
重写func viewDidLoad（）{
super.viewDidLoad（）
打印（UIScreen.main.bounds）
//self.view.layer.masksToBounds=true
让视图=[
UIButton（类型：.infoDark），
UIButton（类型：。contactAdd），
UIButton（类型：。详细信息披露）
]
views.forEach（self.stackView.addArrangedSubview）
self.backgroundView.backgroundColor=UIColor.red
self.backgroundView.translates自动调整大小gmaskintoConstraints=false
self.view.addSubview（self.backgroundView）
self.topView.backgroundColor=UIColor.green
self.topView.translatesAutoresizingMaskIntoConstraints=false
self.view.addSubview（self.topView）
self.stackView.axis=isPortrait（）？。水平：。垂直
self.stackView.distribution=.fillview
self.stackView.translatesAutoResizengMaskintoConstraints=false
self.backgroundView.addSubview（self.stackView）
self.topView.topAnchor.constraint（等式：self.topLayoutGuide.bottomAnchor）.isActive=true
self.topView.leadingAnchor.constraint（等式：self.view.leadingAnchor）.isActive=true
self.topView.trailingAnchor.constraint（equalTo:self.view.trailingAnchor）.isActive=true
self.topView.heightAnchor.constraint（equalToConstant:46）。isActive=true
self.view.addLayoutGuide（self.layoutGuide）
self.view.addLayoutGuide（self.bLayoutGuide）
self.bLayoutGuide.bottomAnchor.constraint（equalTo:self.view.bottomAnchor）.isActive=true
self.bLayoutGuide.leadingAnchor.constraint（等式：self.view.leadingAnchor）.isActive=true
self.bLayoutGuide.trailingAnchor.constraint（equalTo:self.view.trailingAnchor）.isActive=true
self.bLayoutHeightConstraint=self.bLayoutGuide.heightAnchor.constraint（equalToConstant:isPortrait（）？sizeConstant:0）
self.bLayoutHeightConstraint.isActive=true
self.lLayoutGuide.topAnchor.constraint（等式：self.topView.bottomAnchor）.isActive=true
self.lLayoutGuide.bottomAnchor.constraint（equalTo:self.view.bottomAnchor）.isActive=true
self.lLayoutGuide.leadingAnchor.constraint（等式：self.view.leadingAnchor）.isActive=true
self.lLayoutWidthConstraint=self.lLayoutGuide.widthAnchor.constraint（equalToConstant:isPortrait（）？0:sizeConstant）
self.lLayoutWidthConstraint.isActive=true
self.stackView.topanch.constraint（equalTo:self.backgroundView.topanch）.isActive=true
self.stackView.bottomAnchor.constraint（equalTo:self.backgroundView.bottomAnchor）.isActive=true
self.stackView.leadingAnchor.constraint（等式：self.backgroundView.leadingAnchor）.isActive=true
self.stackView.trailingAnchor.constraint（等式：self.backgroundView.trailingAnchor）.isActive=true
self.bottom约束=[
self.backgroundView.topAnchor.constraint（等式：self.bLayoutGuide.topAnchor），
self.backgroundView.leadingAnchor.constraint（等式：self.bLayoutGuide.leadingAnchor），
self.backgroundView.trailingAnchor.constraint（等式：self.bLayoutGuide.trailingAnchor），
self.backgroundView.heightAnchor.constraint（equalToConstant:sizeConstant）
]
self.leftConstraints=[
self.backgroundView.topAnchor.constraint（等式：self.lLayoutGuide.topAnchor），
self.backgroundView.bottomAnchor.constraint（等式：self.lLayoutGuide.bottomAnchor），
self.backgroundView.trailingAnchor.constraint（等式：self.lLayoutGuide.trailingAnchor），
self.backgroundView.widthAnchor.constraint（equalToConstant:sizeConstant）
]
如果isPortrait（）{
NSLayoutConstraint.activate（self.bottomConstraints）
}否则{
NSLayoutConstraint.activate（self.leftConstraints）
}
}
重写func viewWillTransition（到大小：CGSize，带协调器：UIViewControllerTransitionCoordinator）{
让willbe纵向=size.widthoverride func viewWillTransition(to size: CGSize, with coordinator: UIViewControllerTransitionCoordinator) {
let willBePortrait = size.width < size.height
if willBePortrait {
self.stackView.axis = .horizontal
NSLayoutConstraint.deactivate(self.leftConstraints)
NSLayoutConstraint.activate(self.bottomConstraints)
} else {
self.stackView.axis = .vertical
NSLayoutConstraint.deactivate(self.bottomConstraints)
NSLayoutConstraint.activate(self.leftConstraints)
}
self.view.layoutIfNeeded()
coordinator.animate(alongsideTransition: { context in
let halfDuration = context.transitionDuration / 2
UIView.animate(withDuration: halfDuration, animations: {
if willBePortrait {
self.lLayoutWidthConstraint.constant = 0
} else {
self.bLayoutHeightConstraint.constant = 0
}
})
UIView.animate(withDuration: halfDuration, delay: halfDuration, animations: {
if willBePortrait {
self.bLayoutHeightConstraint.constant = sizeConstant
} else {
self.lLayoutWidthConstraint.constant = sizeConstant
}
self.view.layoutIfNeeded()
})
})
super.viewWillTransition(to: size, with: coordinator)
}