我有一个高度可调的容器 View 。现在我想根据容器 View 的高度设置 subview Controller 的 View 的相同框架。有时它在模拟中确实有效,但通常会失败。 subview Controller View 的框架通常与开始时定义的相同。您知道解决此问题的解决方法吗?
这是我的主ViewController
,其中containerView
名为bottomView
class ViewController: UIViewController {
var startPosition: CGPoint!
var originalHeight: CGFloat = 0
var bottomView = UIView()
var gestureRecognizer = UIPanGestureRecognizer()
let scrollView = UIScrollView()
let controller = EditorViewController()
override func viewDidLoad() {
self.view.backgroundColor = .white
view.addSubview(bottomView)
bottomView.translatesAutoresizingMaskIntoConstraints = false
bottomView.bottomAnchor.constraint(equalTo: view.bottomAnchor).isActive = true
bottomView.leftAnchor.constraint(equalTo: view.leftAnchor).isActive = true
bottomView.rightAnchor.constraint(equalTo: view.rightAnchor).isActive = true
bottomView.heightAnchor.constraint(equalToConstant: 100).isActive = true
bottomView.backgroundColor = .white
gestureRecognizer = UIPanGestureRecognizer(target: self, action: #selector(viewDidDragged(_:)))
bottomView.isUserInteractionEnabled = true
bottomView.addGestureRecognizer(gestureRecognizer)
// add childviewController
self.addChild(controller)
controller.view.translatesAutoresizingMaskIntoConstraints = false
controller.view.frame = bottomView.bounds
bottomView.addSubview(controller.view)
controller.view.rightAnchor.constraint(equalTo: bottomView.rightAnchor).isActive = true
controller.view.leftAnchor.constraint(equalTo: bottomView.leftAnchor).isActive = true
controller.view.bottomAnchor.constraint(equalTo: bottomView.bottomAnchor).isActive = true
controller.view.topAnchor.constraint(equalTo: bottomView.topAnchor).isActive = true
controller.didMove(toParent: self)
}
}
childView
Controller 如下所示:
class EditorViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
self.view.backgroundColor = .red
}
通过这种方式,我更改了容器 View 的高度,并尝试调整子 viewController
的高度。但这不起作用。
@objc func viewDidDragged(_ sender: UIPanGestureRecognizer) {
if sender.state == .began {
startPosition = gestureRecognizer.location(in: self.view) // the postion at which PanGestue Started
originalHeight = bottomView.frame.size.height
}
if sender.state == .began || sender.state == .changed {
let endPosition = sender.location(in: self.view)
let difference = endPosition.y - startPosition.y
let newHeight = originalHeight - difference
if self.view.frame.size.height - endPosition.y < 100 {
bottomView.frame = CGRect(x: 0, y: self.view.frame.size.height - 100, width: self.view.frame.size.width, height: 100)
controller.view.frame = bottomView.bounds
} else {
bottomView.frame = CGRect(x: 0, y: self.view.frame.size.height - newHeight, width: self.view.frame.size.width, height: newHeight)
controller.view.frame = bottomView.bounds
}
}
if sender.state == .ended || sender.state == .cancelled {
//Do Something
}
}
最佳答案
尝试使用约束来更改高度。像这样的东西:
class ViewController: UIViewController {
...
var heightConstraint: NSLayoutConstraint?
override func viewDidLoad() {
...
heightConstraint = bottomView.heightAnchor.constraint(equalToConstant: 100)
heightConstraint?.isActive = true
....
}
@objc func viewDidDragged(_ sender: UIPanGestureRecognizer) {
...
if sender.state == .began || sender.state == .changed {
let endPosition = sender.location(in: self.view)
let difference = endPosition.y - startPosition.y
let newHeight = originalHeight - difference
if self.view.frame.size.height - endPosition.y < 100 {
heightConstraint?.constant = 100
} else {
heightConstraint?.constant = newHeight
}
}
...
}
}
关于swift - 如何调整 subview Controller 的高度以匹配容器 View 的高度,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/55559064/