我有一個基于這個
它作業得很好，但是 shapeLayer 沿著它只有 1 個紅色的 CAGradientLayer 顏色跟隨。我想要的是 shapeLayer 根據滑塊的某些點更改顏色。例如，0.4 - 0.5 為紅色，0.7-0.8 為紅色，0.9-0.95 為紅色。這些不是實際值，實際值會有所不同。我認為任何時候它不符合變紅的條件，它可能只是一個清晰的顏色，它只會顯示它下面的黑色軌道。結果看起來像這樣（不要介意形狀）
紅色基于用戶擦洗滑塊和放手。決定紅色的滑塊的不同位置取決于任何條件。我怎樣才能做到這一點。
UISlider
lazy var slider: UISlider = {
let s = UISlider()
s.translatesAutoresizingMaskIntoConstraints = false
s.minimumTrackTintColor = .blue
s.maximumTrackTintColor = .white
s.minimumValue = 0
s.maximumValue = 1
s.addTarget(self, action: #selector(onSliderChange), for: .valueChanged)
return s
s.addTarget(self, action: #selector(onSliderEnded), for: [.touchUpInside, .touchUpOutside, .touchCancel])
return s
}()
lazy var progressView: GradientProgressView = {
let v = GradientProgressView()
v.translatesAutoresizingMaskIntoConstraints = false
return v
}()
@objc fileprivate func onSliderChange(_ slider: UISlider) {
let condition: Bool = // ...
let value = slider.value
progressView.setProgress(CGFloat(value), someCondition: condition, slider_X_Position: slider_X_PositionInView())
}
@objc fileprivate func onSliderEnded(_ slider: UISlider) {
let value = slider.value
progressView.resetProgress(CGFloat(value))
}
// ... progressView is the same width as the the slider
func slider_X_PositionInView() -> CGFloat {
let trackRect = slider.trackRect(forBounds: slider.bounds)
let thumbRect = slider.thumbRect(forBounds: slider.bounds,
trackRect: trackRect,
value: slider.value)
let convertedThumbRect = slider.convert(thumbRect, to: self.view)
return convertedThumbRect.midX
}
漸變進度視圖：
public class GradientProgressView: UIView {
var shapeLayer: CAShapeLayer = {
// ...
}()
private var trackLayer: CAShapeLayer = {
let trackLayer = CAShapeLayer()
trackLayer.strokeColor = UIColor.black.cgColor
trackLayer.fillColor = UIColor.clear.cgColor
trackLayer.lineCap = .round
return trackLayer
}()
private var gradient: CAGradientLayer = {
let gradient = CAGradientLayer()
let redColor = UIColor.red.cgColor
gradient.colors = [redColor, redColor]
gradient.locations = [0.0, 1.0]
gradient.startPoint = CGPoint(x: 0, y: 0)
gradient.endPoint = CGPoint(x: 1, y: 0)
return gradient
}()
// ... add the above layers as subLayers to self ...
func updatePaths() { // added in layoutSubviews
let lineWidth = bounds.height / 2
trackLayer.lineWidth = lineWidth * 0.75
shapeLayer.lineWidth = lineWidth
let path = UIBezierPath()
path.move(to: CGPoint(x: bounds.minX lineWidth / 2, y: bounds.midY))
path.addLine(to: CGPoint(x: bounds.maxX - lineWidth / 2, y: bounds.midY))
trackLayer.path = path.cgPath
shapeLayer.path = path.cgPath
gradient.frame = bounds
gradient.mask = shapeLayer
shapeLayer.duration = 1
shapeLayer.strokeStart = 0
shapeLayer.strokeEnd = 0
}
public func setProgress(_ progress: CGFloat, someCondition: Bool, slider_X_Position: CGFloat) {
// slider_X_Position might help with shapeLayer's x position for the colors ???
if someCondition {
// redColor until the user lets go
} else {
// otherwise always a clearColor
}
shapeLayer.strokeEnd = progress
}
}
public func resetProgress(_ progress: CGFloat) {
// change to clearColor after finger is lifted
}
}
uj5u.com熱心網友回復：
要得到這個：
我們可以將 aCAShapeLayer用于紅色“盒子”，并將 aCALayer作為.mask該形狀圖層上的 a。
為了顯示/覆寫框，我們將遮罩層的框架設定為邊界寬度的百分比。
這是一個完整的例子：
class StepView: UIView {
public var progress: CGFloat = 0 {
didSet {
setNeedsLayout()
}
}
public var steps: [[CGFloat]] = [[0.0, 1.0]] {
didSet {
setNeedsLayout()
}
}
public var color: UIColor = .red {
didSet {
stepLayer.fillColor = color.cgColor
}
}
private let stepLayer = CAShapeLayer()
private let maskLayer = CALayer()
override init(frame: CGRect) {
super.init(frame: frame)
commonInit()
}
required init?(coder: NSCoder) {
super.init(coder: coder)
commonInit()
}
private func commonInit() {
backgroundColor = .black
layer.addSublayer(stepLayer)
stepLayer.fillColor = color.cgColor
stepLayer.mask = maskLayer
// mask layer can use any solid color
maskLayer.backgroundColor = UIColor.white.cgColor
}
override func layoutSubviews() {
super.layoutSubviews()
stepLayer.frame = bounds
let pth = UIBezierPath()
steps.forEach { pair in
// rectangle for each "percentage pair"
let w = bounds.width * (pair[1] - pair[0])
let b = UIBezierPath(rect: CGRect(x: bounds.width * pair[0], y: 0, width: w, height: bounds.height))
pth.append(b)
}
stepLayer.path = pth.cgPath
// update frame of mask layer
var r = bounds
r.size.width = bounds.width * progress
maskLayer.frame = r
}
}
class StepVC: UIViewController {
let stepView = StepView()
override func viewDidLoad() {
super.viewDidLoad()
stepView.translatesAutoresizingMaskIntoConstraints = false
let slider = UISlider()
slider.translatesAutoresizingMaskIntoConstraints = false
view.addSubview(stepView)
view.addSubview(slider)
let g = view.safeAreaLayoutGuide
NSLayoutConstraint.activate([
stepView.topAnchor.constraint(equalTo: g.topAnchor, constant: 80.0),
stepView.leadingAnchor.constraint(equalTo: g.leadingAnchor, constant: 20.0),
stepView.trailingAnchor.constraint(equalTo: g.trailingAnchor, constant: -20.0),
stepView.heightAnchor.constraint(equalToConstant: 40.0),
slider.topAnchor.constraint(equalTo: stepView.bottomAnchor, constant: 40.0),
slider.leadingAnchor.constraint(equalTo: g.leadingAnchor, constant: 20.0),
slider.trailingAnchor.constraint(equalTo: g.trailingAnchor, constant: -20.0),
])
let steps: [[CGFloat]] = [
[0.1, 0.3],
[0.4, 0.5],
[0.7, 0.8],
[0.9, 0.95],
]
stepView.steps = steps
slider.addTarget(self, action: #selector(sliderChanged(_:)), for: .valueChanged)
}
@objc func sliderChanged(_ sender: UISlider) {
// disable CALayer "built-in" animations
CATransaction.setDisableActions(true)
stepView.progress = CGFloat(sender.value)
CATransaction.commit()
}
}
編輯
我仍然不清楚您的0.4 - 0.8要求，但也許這會幫助您上路：
請注意：這只是示例代碼！！！
struct RecordingStep {
var color: UIColor = .black
var start: Float = 0
var end: Float = 0
var layer: CALayer!
}
class StepView2: UIView {
public var progress: Float = 0 {
didSet {
// move the progress layer
progressLayer.position.x = bounds.width * CGFloat(progress)
// if we're recording
if isRecording {
let i = theSteps.count - 1
guard i > -1 else { return }
// update current "step" end
theSteps[i].end = progress
setNeedsLayout()
}
}
}
private var isRecording: Bool = false
private var theSteps: [RecordingStep] = []
private let stepLayers: [CALayer] = []
private let progressLayer = CAShapeLayer()
public func startRecording(_ color: UIColor) {
// create a new "Recording Step"
var st = RecordingStep()
st.color = color
st.start = progress
st.end = progress
let l = CALayer()
l.backgroundColor = st.color.cgColor
layer.insertSublayer(l, below: progressLayer)
st.layer = l
theSteps.append(st)
isRecording = true
}
public func stopRecording() {
isRecording = false
}
override init(frame: CGRect) {
super.init(frame: frame)
commonInit()
}
required init?(coder: NSCoder) {
super.init(coder: coder)
commonInit()
}
private func commonInit() {
backgroundColor = .black
progressLayer.lineWidth = 3
progressLayer.strokeColor = UIColor.green.cgColor
progressLayer.fillColor = UIColor.clear.cgColor
layer.addSublayer(progressLayer)
}
override func layoutSubviews() {
super.layoutSubviews()
// only set the progessLayer frame if the bounds height has changed
if progressLayer.frame.height != bounds.height 7.0 {
let r: CGRect = CGRect(origin: .zero, size: CGSize(width: 7.0, height: bounds.height 7.0))
let pth = UIBezierPath(roundedRect: r, cornerRadius: 3.5)
progressLayer.frame = r
progressLayer.position = CGPoint(x: 0, y: bounds.midY)
progressLayer.path = pth.cgPath
}
theSteps.forEach { st in
let x = bounds.width * CGFloat(st.start)
let w = bounds.width * CGFloat(st.end - st.start)
let r = CGRect(x: x, y: 0.0, width: w, height: bounds.height)
st.layer.frame = r
}
}
}
class Step2VC: UIViewController {
let stepView = StepView2()
let actionButton: UIButton = {
let b = UIButton()
b.backgroundColor = .lightGray
b.setImage(UIImage(systemName: "play.fill"), for: [])
b.tintColor = .systemGreen
return b
}()
var timer: Timer!
let colors: [UIColor] = [
.red, .systemBlue, .yellow, .cyan, .magenta, .orange,
]
var colorIdx: Int = -1
var action: Int = 0
override func viewDidLoad() {
super.viewDidLoad()
stepView.translatesAutoresizingMaskIntoConstraints = false
actionButton.translatesAutoresizingMaskIntoConstraints = false
view.addSubview(stepView)
view.addSubview(actionButton)
let g = view.safeAreaLayoutGuide
NSLayoutConstraint.activate([
stepView.topAnchor.constraint(equalTo: g.topAnchor, constant: 80.0),
stepView.leadingAnchor.constraint(equalTo: g.leadingAnchor, constant: 20.0),
stepView.trailingAnchor.constraint(equalTo: g.trailingAnchor, constant: -20.0),
stepView.heightAnchor.constraint(equalToConstant: 40.0),
actionButton.topAnchor.constraint(equalTo: stepView.bottomAnchor, constant: 40.0),
actionButton.widthAnchor.constraint(equalToConstant: 80.0),
actionButton.centerXAnchor.constraint(equalTo: g.centerXAnchor),
])
actionButton.addTarget(self, action: #selector(btnTap(_:)), for: .touchUpInside)
}
@objc func timerFunc(_ timer: Timer) {
// don't set progress > 1.0
stepView.progress = min(stepView.progress 0.005, 1.0)
if stepView.progress >= 1.0 {
timer.invalidate()
actionButton.isHidden = true
}
}
@objc func btnTap(_ sender: UIButton) {
switch action {
case 0:
// this will run for 15 seconds
timer = Timer.scheduledTimer(timeInterval: 0.075, target: self, selector: #selector(timerFunc(_:)), userInfo: nil, repeats: true)
stepView.stopRecording()
actionButton.setImage(UIImage(systemName: "record.circle"), for: [])
actionButton.tintColor = .red
action = 1
case 1:
colorIdx = 1
stepView.startRecording(colors[colorIdx % colors.count])
actionButton.setImage(UIImage(systemName: "stop.circle"), for: [])
actionButton.tintColor = .black
action = 2
case 2:
stepView.stopRecording()
actionButton.setImage(UIImage(systemName: "record.circle"), for: [])
actionButton.tintColor = .red
action = 1
default:
()
}
}
}
For future reference, when posting here, it's probably a good idea to fully explain what you're trying to do. Showing code you're working on is important, but if it's really only sorta related to your actual goal, it makes this process pretty difficult.
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