我有一个包含 3 个主要部分的 UI:标题、键盘和按钮。
头部和按钮的大小是固定的,剩余的区域应该被键盘占据。
像这样:
键盘部分由嵌套的 UIStackView(垂直 UIStackView 父级,具有 4 个水平 UIStackView 子级)构建,3 个按钮将添加到每个水平 UIStackView。
一切都很好,除了我希望按钮与水平 UIStackView 具有相同的高度,以便用户单击它应该更容易。
我努力了
rowStackView.alignment = .fill
要么
for button in numberButtons
{
button.translatesAutoresizingMaskIntoConstraints = false
button.heightAnchor.constraint(equalTo: button.superview!.heightAnchor).isActive = true
}
但是, numberPadStackView 将被挤压如下。我该如何解决?谢谢。
这些是我现在的代码:
headerStackView.axis = .vertical
headerStackView.alignment = .center
headerStackView.setContentHuggingPriority(.defaultHigh, for: .vertical)
headerStackView.setContentCompressionResistancePriority(.defaultHigh, for: .vertical)
view.addSubview(headerStackView)
numberPadStackView.axis = .vertical
numberPadStackView.distribution = .fillEqually
numberPadStackView.alignment = .center
view.addSubview(numberPadStackView)
initNumpad()
view.addSubview(requestLabel)
initNumPad ()
private func initNumpad()
{
var rowStackView = UIStackView()
numberButtons.removeAll()
for i in 0 ..< 11
{
if i % 3 == 0
{
rowStackView = UIStackView()
rowStackView.axis = .horizontal
rowStackView.distribution = .fillEqually
rowStackView.alignment = .center
rowStackView.setContentHuggingPriority(.defaultLow, for: .vertical)
numberPadRowStackView.append(rowStackView)
numberPadStackView.addArrangedSubview(rowStackView)
}
let button = UIButton()
switch i
{
case 0 ..< 9:
button.setTitle("\(i + 1)", for: .normal)
case 9:
button.setTitle(".", for: .normal)
case 10:
button.setTitle("0", for: .normal)
default:
return
}
button.titleLabel?.textAlignment = .center
button.setContentHuggingPriority(.defaultLow, for: .vertical)
button.backgroundColor = UIColor.random()
numberButtons.append(button)
rowStackView.addArrangedSubview(button)
}
numberPadDeleteImageView.backgroundColor = UIColor.random()
rowStackView.addArrangedSubview(numberPadDeleteImageView)
}
布局
headerStackView.translatesAutoresizingMaskIntoConstraints = false
numberPadStackView.translatesAutoresizingMaskIntoConstraints = false
requestLabel.translatesAutoresizingMaskIntoConstraints = false
NSLayoutConstraint.activate([
headerStackView.topAnchor.constraint(equalTo: view.safeAreaLayoutGuide.topAnchor, constant: 24),
headerStackView.leadingAnchor.constraint(equalTo: view.leadingAnchor, constant: Padding),
headerStackView.trailingAnchor.constraint(equalTo: view.trailingAnchor, constant: -Padding),
numberPadStackView.topAnchor.constraint(equalTo: headerStackView.bottomAnchor, constant: 43),
numberPadStackView.leadingAnchor.constraint(equalTo: view.leadingAnchor, constant: Padding),
numberPadStackView.trailingAnchor.constraint(equalTo: view.trailingAnchor, constant: -Padding),
requestLabel.topAnchor.constraint(equalTo: numberPadStackView.bottomAnchor, constant: 21),
requestLabel.leadingAnchor.constraint(equalTo: view.leadingAnchor, constant: 28),
requestLabel.trailingAnchor.constraint(equalTo: view.trailingAnchor, constant: -28),
requestLabel.bottomAnchor.constraint(equalTo: view.safeAreaLayoutGuide.bottomAnchor, constant: -5),
requestLabel.heightAnchor.constraint(equalToConstant: 40),
])
for rowStackView in numberPadRowStackView
{
rowStackView.translatesAutoresizingMaskIntoConstraints = false
rowStackView.widthAnchor.constraint(equalTo: numberPadStackView.widthAnchor).isActive = true
}
Couple notes...
Setting Content Hugging Priority on a UIStackView
is generally not going to give you the expected results. That's because the stack view is arranging its subviews (based on the stack view's Alignment and Distribution properties). The Content Hugging Priority of the stack view's arranged subviews will be the controlling factor.
As is obvious, if I lay out 4 labels, vertically constrained top-to-bottom, each having the same Content Hugging priority (such as the default 250), I'll get something like this in Storyboard (note the Red layout-problem indicator):
and at runtime it may look like this:
Auto-layout is going to respect the (intrinsic) Height for Labels 1, 2 and 4, and then stretch Label 3 to complete the layout.
If I embed the top two and bottom two labels each in vertical stack views...
Storyboard will look like this (again, note the Red layout-problem indicator):
and we get the same thing at run-time:
Even if I set the Content Hugging Priority of the top stack view to 1000, it won't make a difference -- because auto-layout is using the arranged subviews to decide what to do.
So, for your layout, divide your screen into *three layout elements:
and then tell auto-layout you want the Header and Process elements to maintain their heights, and allow the numberPad to stretch.
由于 UI 元素默认为 250 的拥抱优先级,可能最简单的管理方法是降低数字键盘按钮的拥抱优先级。
这是一些示例代码。我不确定您如何布置“headerStackView”,因为它看起来并不适合堆栈视图……所以,我将其布置为标题UIView
:
class WithNumpadViewController: UIViewController {
// three "parts" to our layout
let headerView = UIView()
let numberPadStackView = UIStackView()
let requestLabel = UILabel()
// data labels to be filled-in
let currencyLabel = UILabel()
let currValueLabel = UILabel()
let balanceLabel = UILabel()
// however you're using this
var numberButtons: [UIButton] = []
let Padding: CGFloat = 16
override func viewDidLoad() {
super.viewDidLoad()
if let vc = self.navigationController?.viewControllers.first {
vc.navigationItem.title = "Wallet"
}
self.navigationController?.navigationBar.barTintColor = .black
self.navigationController?.navigationBar.tintColor = .white
self.navigationController?.navigationBar.isTranslucent = false
self.navigationController?.navigationBar.titleTextAttributes = [NSAttributedString.Key.foregroundColor: UIColor.white]
title = "Withdraw"
// add "three parts" to view
[headerView, numberPadStackView, requestLabel].forEach {
$0.translatesAutoresizingMaskIntoConstraints = false
view.addSubview($0)
}
let g = view.safeAreaLayoutGuide
NSLayoutConstraint.activate([
// constrain headerView to Top / Leading / Trailing (safe-area)
// let its content determine its height
headerView.topAnchor.constraint(equalTo: g.topAnchor, constant: 0.0),
headerView.leadingAnchor.constraint(equalTo: g.leadingAnchor, constant: 0.0),
headerView.trailingAnchor.constraint(equalTo: g.trailingAnchor, constant: 0.0),
// constrain numberPad 40-pts from Bottom headerView
numberPadStackView.topAnchor.constraint(equalTo: headerView.bottomAnchor, constant: 40),
// Leading / Trailing with Padding
numberPadStackView.leadingAnchor.constraint(equalTo: g.leadingAnchor, constant: Padding),
numberPadStackView.trailingAnchor.constraint(equalTo: g.trailingAnchor, constant: -Padding),
// constrain requestLabel 21-pts from Bottom of numberPad
requestLabel.topAnchor.constraint(equalTo: numberPadStackView.bottomAnchor, constant: 21),
// Leading / Trailing with 28-pts padding
requestLabel.leadingAnchor.constraint(equalTo: g.leadingAnchor, constant: 28),
requestLabel.trailingAnchor.constraint(equalTo: g.trailingAnchor, constant: -28),
// Bottom 5-pts from Bottom (safe-area)
requestLabel.bottomAnchor.constraint(equalTo: g.bottomAnchor, constant: -5),
// explicit Height of 40-pts
requestLabel.heightAnchor.constraint(equalToConstant: 40),
])
// setup contents of headerView
initHeader()
// setup contents of numberPad
initNumpad()
// properties for requestLabel
requestLabel.backgroundColor = .black
requestLabel.textColor = .white
requestLabel.textAlignment = .center
requestLabel.text = "Process"
// fill-in data labels
currencyLabel.text = "HKD"
currValueLabel.text = "0"
balanceLabel.text = "Balance: HKD 2 (Available)"
// maybe add number pad button actions here?
numberButtons.forEach { b in
b.addTarget(self, action: #selector(self.numberPadButtonTapped(_:)), for: .touchUpInside)
}
}
@objc func numberPadButtonTapped(_ btn: UIButton) -> Void {
let t = btn.currentTitle ?? "Delete"
print("Tapped:", t)
// do what you want based on which button was tapped
}
private func initHeader()
{
// not clear how you're setting up your "header"
// so I'll guess at it
// view properties
headerView.backgroundColor = .black
headerView.clipsToBounds = true
headerView.layer.cornerRadius = 24
headerView.layer.maskedCorners = [.layerMinXMaxYCorner, .layerMaxXMaxYCorner]
// static text label
let transferToLabel = UILabel()
transferToLabel.text = "Transfer to..."
transferToLabel.font = UIFont.systemFont(ofSize: 14.0, weight: .regular)
// PayPal button
let payPalButton = UIButton()
payPalButton.setTitle("PayPal", for: [])
payPalButton.backgroundColor = .white
payPalButton.setTitleColor(.blue, for: [])
// data label fonts
currencyLabel.font = UIFont.systemFont(ofSize: 28.0, weight: .bold)
currValueLabel.font = currencyLabel.font
balanceLabel.font = UIFont.systemFont(ofSize: 11.0, weight: .regular)
// label text color
[transferToLabel, currencyLabel, currValueLabel, balanceLabel].forEach {
$0.textColor = .white
}
// horizontal stack to hold currencyLabel, currValueLabel
let currValStack = UIStackView()
currValStack.axis = .horizontal
currValStack.spacing = 12
// vertical stack to hold currValStack, balanceLabel
let innerVStack = UIStackView()
innerVStack.axis = .vertical
innerVStack.alignment = .center
innerVStack.spacing = 2
// add labels to Horizontal stack
currValStack.addArrangedSubview(currencyLabel)
currValStack.addArrangedSubview(currValueLabel)
// add horizontal stack and balanceLabel to vertical stack
innerVStack.addArrangedSubview(currValStack)
innerVStack.addArrangedSubview(balanceLabel)
// view to hold vertical stack (so we can center it vertically)
let innerView = UIView()
// add vertical stack to innerView
innerView.addSubview(innerVStack)
// add elements to headerView
headerView.addSubview(transferToLabel)
headerView.addSubview(payPalButton)
headerView.addSubview(innerView)
// we'll be applying constraints
[headerView, transferToLabel, payPalButton, currencyLabel, currValueLabel, balanceLabel,
innerView, innerVStack].forEach {
$0.translatesAutoresizingMaskIntoConstraints = false
}
NSLayoutConstraint.activate([
// "Transfer to..." label Top: Padding, leading: Padding
transferToLabel.topAnchor.constraint(equalTo: headerView.topAnchor, constant: Padding),
transferToLabel.leadingAnchor.constraint(equalTo: headerView.leadingAnchor, constant: Padding),
// payPal button Top: Padding to transfer label Bottom
// Leading / Trailing to Leading / Trailing with Padding
payPalButton.topAnchor.constraint(equalTo: transferToLabel.bottomAnchor, constant: Padding),
payPalButton.leadingAnchor.constraint(equalTo: headerView.leadingAnchor, constant: Padding),
payPalButton.trailingAnchor.constraint(equalTo: headerView.trailingAnchor, constant: -Padding),
// payPalButton explicit height
payPalButton.heightAnchor.constraint(equalToConstant: 50.0),
// innerView Top: 0 to payPal button Bottom
// Leading / Trailing to Leading / Trailing with Padding
// Bottom: 0
innerView.topAnchor.constraint(equalTo: payPalButton.bottomAnchor, constant: 0.0),
innerView.leadingAnchor.constraint(equalTo: headerView.leadingAnchor, constant: Padding),
innerView.trailingAnchor.constraint(equalTo: headerView.trailingAnchor, constant: -Padding),
innerView.bottomAnchor.constraint(equalTo: headerView.bottomAnchor, constant: 0.0),
// innerVStack Top / Bottom to innerView Top / Bottom with 24-pts padding
// centerX
innerVStack.topAnchor.constraint(equalTo: innerView.topAnchor, constant: 32.0),
innerVStack.bottomAnchor.constraint(equalTo: innerView.bottomAnchor, constant: -32.0),
innerVStack.centerXAnchor.constraint(equalTo: innerView.centerXAnchor, constant: 0.0),
])
}
private func initNumpad()
{
numberButtons.removeAll()
// numberPad stack properties
numberPadStackView.axis = .vertical
numberPadStackView.alignment = .fill
numberPadStackView.distribution = .fillEqually
numberPadStackView.spacing = 4
// a little more logical way to manage button layout
let buttonLabels: [[String]] = [
["1", "2", "3"],
["4", "5", "6"],
["7", "8", "9"],
[".", "0", "<"],
]
// adjust as desired
let btnFontSize: CGFloat = 28
buttonLabels.forEach { thisRowLabels in
// create a "row" stack view
let rowStack = UIStackView()
rowStack.axis = .horizontal
rowStack.alignment = .fill
rowStack.distribution = .fillEqually
// same horizontal spacing as "number pad" stack's vertical spacing
rowStack.spacing = numberPadStackView.spacing
// for each number string
thisRowLabels.forEach { s in
// create button
let btn = UIButton()
if s == "<" {
// if it's the "delete button"
// set image here
let iconCfg = UIImage.SymbolConfiguration(pointSize: btnFontSize, weight: .bold, scale: .large)
if let normIcon = UIImage(systemName: "delete.left", withConfiguration: iconCfg)?.withTintColor(.black, renderingMode: .alwaysOriginal),
let highIcon = UIImage(systemName: "delete.left", withConfiguration: iconCfg)?.withTintColor(.lightGray, renderingMode: .alwaysOriginal)
{
btn.setImage(normIcon, for: .normal)
btn.setImage(highIcon, for: .highlighted)
}
} else {
// set number pad button title
btn.setTitle(s, for: [])
}
// number pad button properties
btn.backgroundColor = UIColor(white: 0.95, alpha: 1.0)
btn.setTitleColor(.black, for: .normal)
btn.setTitleColor(.lightGray, for: .highlighted)
btn.titleLabel?.font = UIFont.systemFont(ofSize: btnFontSize, weight: .bold)
// let's give 'em a rounded-corner border
btn.layer.borderColor = UIColor.blue.cgColor
btn.layer.borderWidth = 1
btn.layer.cornerRadius = 8
// allow buttons to stretch vertically!!!
btn.setContentHuggingPriority(UILayoutPriority(rawValue: 249), for: .vertical)
// add button to this row stack
rowStack.addArrangedSubview(btn)
// add button to numberButtons array
numberButtons.append(btn)
}
// add this rowStack to the number pad stack
numberPadStackView.addArrangedSubview(rowStack)
}
}
}
结果,在 iPhone 8 上:
iPhone 11:
和 iPhone 11 Pro Max:
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