[英]Swift: UIStackView Overlapping all Views instead of Stacking them Vertically
我正在嘗試為我的應用程序創建一個統計頁面,該頁面將根據用戶擁有的數據類型動態創建各種圖表。 為此,我根據本教程堆疊多個 ViewController: https : //swiftwithmajid.com/2019/02/27/building-complex-screens-with-child-viewcontrollers/
我遇到了一個問題,即 ViewController 的視圖作為一個排列的子視圖添加到主 StackView,但它不是垂直堆疊視圖並允許我滾動瀏覽它們,它只是將它們堆疊在 z-方向。
這是 StackViewController 代碼:
class StackViewController: UIViewController {
private let scrollView = UIScrollView()
private let stackView = UIStackView()
override func viewDidLoad() {
super.viewDidLoad()
view.addSubview(scrollView)
scrollView.addSubview(stackView)
setupConstraints()
stackView.axis = .vertical
}
private func setupConstraints() {
scrollView.translatesAutoresizingMaskIntoConstraints = false
stackView.translatesAutoresizingMaskIntoConstraints = false
NSLayoutConstraint.activate([
scrollView.leadingAnchor.constraint(equalTo: view.safeAreaLayoutGuide.leadingAnchor),
scrollView.trailingAnchor.constraint(equalTo: view.safeAreaLayoutGuide.trailingAnchor),
scrollView.topAnchor.constraint(equalTo: view.safeAreaLayoutGuide.topAnchor),
scrollView.bottomAnchor.constraint(equalTo: view.safeAreaLayoutGuide.bottomAnchor),
stackView.leadingAnchor.constraint(equalTo: scrollView.contentLayoutGuide.leadingAnchor),
stackView.trailingAnchor.constraint(equalTo: scrollView.contentLayoutGuide.trailingAnchor),
stackView.topAnchor.constraint(equalTo: scrollView.contentLayoutGuide.topAnchor),
stackView.bottomAnchor.constraint(equalTo: scrollView.contentLayoutGuide.bottomAnchor),
stackView.widthAnchor.constraint(equalTo: scrollView.frameLayoutGuide.widthAnchor)
])
}
}
extension StackViewController {
func add(_ child: UIViewController) {
addChild(child)
stackView.addArrangedSubview(child.view)
print(child.view!)
child.didMove(toParent: self)
}
func remove(_ child: UIViewController) {
guard child.parent != nil else {
return
}
child.willMove(toParent: nil)
stackView.removeArrangedSubview(child.view)
child.view.removeFromSuperview()
child.removeFromParent()
}
}
這是我創建每個視圖控制器並將其添加到 StackViewController 的地方。 現在,我運行一個循環並一遍又一遍地添加單個視圖控制器的副本:
class PrototypeViewController: StackViewController {
override func viewDidLoad() {
super.viewDidLoad()
for _ in 0...10 {
setupUI()
}
}
private func setupUI() {
let storyboard = UIStoryboard(name: "ConsistencyGraph", bundle: .main)
let consistencyGraphVC = storyboard.instantiateViewController(identifier: "ConsistencyGraphVC") as! ConsistencyGraphVC
add(consistencyGraphVC)
consistencyGraphVC.setupUI(name: "sessionName", consistencyPercentage: 30, ballsHit: 10)
}
}
這是視圖控制器代碼:
class ConsistencyGraphVC: UIViewController {
@IBOutlet weak var mainView: UIView!
@IBOutlet weak var titleLabel: UILabel!
@IBOutlet weak var ballsHitLabel: UILabel!
@IBOutlet weak var pieChartView: PieChartView!
override func viewDidLoad() {
super.viewDidLoad()
}
open func setupUI(name: String, consistencyPercentage: Double, ballsHit: Int) {
displayName(name:name)
drawPieChart(consistencyPercentage: consistencyPercentage)
displayBallsHit(ballsHit: ballsHit)
}
private func displayName(name: String) {
let prefix = "Consistency: "
let title = prefix + name
titleLabel.text = title
}
private func displayBallsHit(ballsHit: Int) {
ballsHitLabel.text = String(ballsHit)
}
private func drawPieChart(consistencyPercentage: Double) {
let maxPercent:Double = 100
let remainingPercent = maxPercent - consistencyPercentage
let dataEntry = [PieChartDataEntry(value: consistencyPercentage, data: String(consistencyPercentage)), PieChartDataEntry(value: remainingPercent, data: nil)]
let dataSet = PieChartDataSet(entries: dataEntry)
let chartData = PieChartData(dataSet: dataSet)
let color1 = randomColor()
let color2 = randomColor()
dataSet.colors = [color1, color2]
pieChartView.data = chartData
}
private func randomColor() -> UIColor {
let red = Double(arc4random_uniform(256))
let green = Double(arc4random_uniform(256))
let blue = Double(arc4random_uniform(256))
let color = UIColor(red: CGFloat(red/255), green: CGFloat(green/255), blue: CGFloat(blue/255), alpha: 1)
return color
}
}
起初,我認為這是因為 View Controller 的大小可能不明確。 然后我硬編碼了每個視圖控制器的寬度和高度,但仍然沒有運氣。
非常感謝任何和所有幫助! 我不知道這怎么可能。
先感謝您!
您忘記了 ScrollView 中 StackView 的一些必需約束。 你只有trailing, top, and bottom
是不夠的。
stackView.leadingAnchor
stackView.trailingAnchor
stackView.topAnchor
stackView.bottomAnchor
stackView.widthAnchor
我終於找到了解決方案!
我需要添加:
child.view.heightAnchor.constraint(equalToConstant: child.view.frame.size.height).isActive = true
到這里的 StackViewController:
func add(_ child: UIViewController) {
addChild(child)
child.view.heightAnchor.constraint(equalToConstant: child.view.frame.size.height).isActive = true
stackView.addArrangedSubview(child.view)
child.didMove(toParent: self)
}
我不確定為什么會這樣。 我已經對視圖的高度進行了硬編碼,但是 stackView 還希望我在添加視圖之前對其進行約束。
我希望這對未來的人有所幫助! 多年來,我一直在用頭撞牆……
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