问题描述
花了我几天的时间来寻找这个问题的根源。
我有一个带有自定义表格单元格行的TableView，每个表格单元格内都有一个进度视图。该应用程序要求进度视图的色调基于填充的程度为绿色/琥珀色/红色。
我发现以编程方式设置progresstint会使进度条显得比应有的更饱满。
相关代码（tableView cellForRowAt）：
let Max:Double = MyGroup!.EndTimeSeconds - MyGroup!.StartTimeSeconds //10771
let Progress:Double = Date().timeIntervalSince1970 - MyGroup!.StartTimeSeconds //1599.7007069587708
if (Max >= Progress) {
Cell.DescriptionLabel.textColor = UIColor.black
Cell.SubtitleLabel.textColor = UIColor.black
Cell.TargetDeliveryTimeLabel.textColor = UIColor.pts_darkergrey
Cell.ProgressView.setProgress(Float(Progress / Max),animated: false)
Cell.ProgressView.progress = Float(Progress / Max)
Cell.ProgressView.progresstintColor = UIColor.pts_green //if i comment these out it works.
if (Max * 0.75 <= Progress) {
Cell.ProgressView.progresstintColor = UIColor.pts_pbAmber //if i comment these out it works.
}
} else {
Cell.DescriptionLabel.textColor = UIColor.white
Cell.SubtitleLabel.textColor = UIColor.white
Cell.TargetDeliveryTimeLabel.textColor = UIColor.white
Cell.ProgressView.setProgress(1,animated: false)
Cell.ProgressView.progress = 1
Cell.ProgressView.progresstintColor = UIColor.pts_pbred //if i comment these out it works.
}
Cell.ProgressView.layer.cornerRadius = 4
Cell.ProgressView.clipsToBounds = true
已注释掉progresstint呼叫的屏幕截图：
请注意，设置色调后，第二项的进度条会错误地填充到几乎50％。
进度条应随时间线性填充-但是它将保持静止，直到进度合法地超过此点，然后像往常一样继续进行。
我可能正在看东西，但问题似乎会持续影响前两个项目，而不会影响其余的项目（或多或少）
我已经尝试了ProgressView.progress和ProgressView.setProgress以及ProgressView.progresstintColor和PogressView.tintColor。
解决方法
经过一些搜索和测试之后，看来标准UIProgressView不喜欢某些高度，色调颜色和/或修改的图层组合。
尝试用此UIProgressView替换您的SimpleProgressView
默认值为：
- backgroundColor =白色
- tintColor =蓝色
- cornerRadius = 4
- 固有高度= 4
您应该可以将其用作直接替换-无需对现有代码进行任何其他更改。是@IBDesignable，其中cornerRadius和progress为@IBInspectable，因此您可以设置它们并在Storyboard中查看结果。
@IBDesignable
class SimpleProgressView: UIView {
@IBInspectable public var cornerRadius: CGFloat = 0 {
didSet {
progressBarView.layer.cornerRadius = cornerRadius
layer.cornerRadius = cornerRadius
}
}
private let progressBarView = UIView()
private var widthConstraint: NSLayoutConstraint!
// default height of
override var intrinsicContentSize: CGSize {
return CGSize(width: UIView.noIntrinsicMetric,height: 4.0)
}
// set the background color of the progressBarView to the tint color
override var tintColor: UIColor! {
didSet {
progressBarView.backgroundColor = tintColor
}
}
// update width constraint multiplier when progress changes
@IBInspectable public var progress: Float = 0 {
didSet {
if let wc = widthConstraint {
// cannot modify multiplier directly,so
// deactivate
wc.isActive = false
// create new width constraint with percent as multiplier
// maximum of 1.0
let pct = min(progress,1.0)
self.widthConstraint = progressBarView.widthAnchor.constraint(equalTo: widthAnchor,multiplier: CGFloat(pct))
// activate new width constraint
self.widthConstraint.isActive = true
}
}
}
// we can set .progress property directly,or
// call setProgress (with optional animated parameter)
public func setProgress(_ p: Float,animated: Bool) -> Void {
// don't allow animation if frame height is zero
let doAnim = animated && progressBarView.frame.height != 0
self.progress = p
if doAnim {
UIView.animate(withDuration: 0.3,animations: {
self.layoutIfNeeded()
})
}
}
override func prepareForInterfaceBuilder() {
super.prepareForInterfaceBuilder()
if backgroundColor == nil {
backgroundColor = UIColor.black.withAlphaComponent(0.1)
}
}
override init(frame: CGRect) {
super.init(frame: frame)
commonInit()
}
required init?(coder: NSCoder) {
super.init(coder: coder)
commonInit()
}
private func commonInit() -> Void {
// default background color: black with 0.1 alpha
if backgroundColor == nil {
backgroundColor = UIColor.black.withAlphaComponent(0.1)
}
// default tint color
tintColor = .blue
// default corner radius
cornerRadius = 4
progressBarView.translatesAutoresizingMaskIntoConstraints = false
addSubview(progressBarView)
// create width constraint
// progressBarView width will be set to percentage of self's width
widthConstraint = progressBarView.widthAnchor.constraint(equalTo: widthAnchor,multiplier: 0.0)
NSLayoutConstraint.activate([
// constrain progressBarView Top / Leading / Bottom to self
progressBarView.topAnchor.constraint(equalTo: topAnchor),progressBarView.leadingAnchor.constraint(equalTo: leadingAnchor),progressBarView.bottomAnchor.constraint(equalTo: bottomAnchor),// activate width constraint
widthConstraint,])
clipsToBounds = true
}
}
这是一个快速的测试实现，比较顶部的UIProgressView和下面的SimpleProgressView。进度栏将从10％开始，每次在视图上轻按10％，然后以25％，75％和100％更改颜色：
class ViewController: UIViewController {
let uiProgressView = UIProgressView()
let simpleProgressView = SimpleProgressView()
let labelA = UILabel()
let labelB = UILabel()
var curProgress: Float = 0
override func viewDidLoad() {
super.viewDidLoad()
view.backgroundColor = .white
labelA.text = "Default UIProgressView"
labelB.text = "Custom SimpleProgressView"
[labelA,uiProgressView,labelB,simpleProgressView].forEach { v in
v.translatesAutoresizingMaskIntoConstraints = false
view.addSubview(v)
}
let g = view.safeAreaLayoutGuide
NSLayoutConstraint.activate([
labelA.topAnchor.constraint(equalTo: g.topAnchor,constant: 100.0),labelA.leadingAnchor.constraint(equalTo: g.leadingAnchor,constant: 20.0),labelA.trailingAnchor.constraint(equalTo: g.trailingAnchor,constant: -20.0),uiProgressView.topAnchor.constraint(equalTo: labelA.bottomAnchor,constant: 12.0),uiProgressView.leadingAnchor.constraint(equalTo: g.leadingAnchor,uiProgressView.trailingAnchor.constraint(equalTo: g.trailingAnchor,uiProgressView.heightAnchor.constraint(equalToConstant: 80.0),labelB.topAnchor.constraint(equalTo: uiProgressView.bottomAnchor,constant: 40.0),labelB.leadingAnchor.constraint(equalTo: g.leadingAnchor,labelB.trailingAnchor.constraint(equalTo: g.trailingAnchor,simpleProgressView.topAnchor.constraint(equalTo: labelB.bottomAnchor,simpleProgressView.leadingAnchor.constraint(equalTo: g.leadingAnchor,simpleProgressView.trailingAnchor.constraint(equalTo: g.trailingAnchor,simpleProgressView.heightAnchor.constraint(equalToConstant: 80.0),])
let t = UITapGestureRecognizer(target: self,action: #selector(self.incProgress(_:)))
view.addGestureRecognizer(t)
// start at 10%
incProgress(nil)
}
@objc func incProgress(_ g: UITapGestureRecognizer?) -> Void {
// increment progress by 10% on each tap,up to 100%
curProgress = min(1.0,curProgress + 0.10)
uiProgressView.progress = curProgress
simpleProgressView.progress = curProgress
let formatter = NumberFormatter()
formatter.numberStyle = .percent
formatter.maximumFractionDigits = 2
if let sPct = formatter.string(for: curProgress) {
labelA.text = "Default UIProgressView: " + sPct
labelB.text = "Custom SimpleProgressView: " + sPct
}
print(curProgress)
if curProgress == 1.0 {
uiProgressView.tintColor = .pts_red
simpleProgressView.tintColor = .pts_red
} else if curProgress >= 0.75 {
uiProgressView.tintColor = .pts_amber
simpleProgressView.tintColor = .pts_amber
} else if curProgress >= 0.25 {
uiProgressView.tintColor = .pts_green
simpleProgressView.tintColor = .pts_green
} else {
uiProgressView.tintColor = .pts_blue
simpleProgressView.tintColor = .pts_blue
}
}
}
我尝试匹配您的自定义颜色：
extension UIColor {
static let pts_green = UIColor(red: 0.35,green: 0.75,blue: 0.5,alpha: 1.0)
static let pts_amber = UIColor(red: 0.95,green: 0.7,blue: 0.0,alpha: 1.0)
static let pts_red = UIColor(red: 0.9,green: 0.35,blue: 0.35,alpha: 1.0)
static let pts_blue = UIColor(red: 0.25,blue: 1.0,alpha: 1.0)
static let pts_darkergrey = UIColor(white: 0.2,alpha: 1.0)
}