我正在使用 Stack View 创建一种表格 UI,StackView 中有 6 个视图,其中 0、2、4 可见,1、3、5 隐藏。当点击其中一个可见视图时,我希望“打开”一个隐藏的视图。
我有这段代码,在 iOS 10 上运行良好,但由于某些原因我无法理解,在 iOS 9 上无法正常工作。
请注意,如果我加载所有视图,则关闭动画将起作用,但在将 hidden 属性设置为 false 时不会打开。
以下是我的代码 -
编辑 经过一些调试,看起来视图高度约束没有从隐藏中恢复,并且它的框架仍然是高度为 0。
import UIKit
class DeckView: UIView {
}
class ViewController: UIViewController {
var scrollView: UIScrollView!
var stackView: UIStackView!
override func viewDidLoad() {
super.viewDidLoad()
scrollView = UIScrollView()
scrollView.translatesAutoresizingMaskIntoConstraints = false
view.addSubview(scrollView)
view.addConstraints(NSLayoutConstraint.constraints(withVisualFormat: "H:|[scrollView]|", options: .alignAllCenterX, metrics: nil, views: ["scrollView": scrollView]))
view.addConstraints(NSLayoutConstraint.constraints(withVisualFormat: "V:|[scrollView]|", options: .alignAllCenterX, metrics: nil, views: ["scrollView": scrollView]))
stackView = UIStackView()
stackView.translatesAutoresizingMaskIntoConstraints = false
stackView.spacing = 0
stackView.alignment = .center
stackView.distribution = .fillProportionally
stackView.axis = .vertical
scrollView.addSubview(stackView)
scrollView.addConstraints(NSLayoutConstraint.constraints(withVisualFormat: "H:|[stackView]|", options: NSLayoutFormatOptions.alignAllCenterX, metrics: nil, views: ["stackView": stackView]))
scrollView.addConstraints(NSLayoutConstraint.constraints(withVisualFormat: "V:|[stackView]|", options: NSLayoutFormatOptions.alignAllCenterX, metrics: nil, views: ["stackView": stackView]))
for i in 0 ..< 8 {
let view = DeckView()
view.tag = i
view.translatesAutoresizingMaskIntoConstraints = false
view.widthAnchor.constraint(equalToConstant: UIScreen.main.bounds.width).isActive = true
view.isUserInteractionEnabled = true
if i%2 == 0 {
view.backgroundColor = UIColor.magenta
let constriant = view.heightAnchor.constraint(equalToConstant:160)
constriant.priority = 999
view.addGestureRecognizer(UITapGestureRecognizer(target: self, action: #selector(self.openDeck(_:))))
view.addConstraint(constriant)
} else {
view.backgroundColor = UIColor.red
let constriant = view.heightAnchor.constraint(equalToConstant:160)
constriant.priority = 999
view.addConstraint(constriant)
view.isHidden = false
}
stackView.addArrangedSubview(view)
}
}
func openDeck(_ sender:UIGestureRecognizer) {
if let view = sender.view as? DeckView,
let childView = stackView.viewWithTag(view.tag + 1) {
UIView.animate(withDuration: 0.4, animations: {
childView.isHidden = !childView.isHidden
})
}
}
}
distribution =.fill
对我来说可以正常工作)。这个bug显然与动画有关,因为当我立即切换isHidden
时,它没有出现。 - Jamie Birch