[英]How draw a rectangle hole on UIBlurEffect and move it on x axis (UIKit)
我正在嘗試在視圖上創建模糊效果,而不是添加將在此模糊層上顯示圖像的形狀(自定義視頻編輯功能)
目前我只能從右邊緣拖動蒙版視圖:
但是當我嘗試從左邊緣做時,我得到了這樣的效果:
func configureBlurView() {
let viewHeight: CGFloat = 60
let padding: CGFloat = 10
blurView = UIView()
blurView.layer.cornerRadius = 10
blurView.clipsToBounds = true
blurView.isHidden = true
blurView.translatesAutoresizingMaskIntoConstraints = false
addSubview(blurView)
addConstraints([
blurView.leadingAnchor.constraint(equalTo: leadingAnchor, constant: padding),
blurView.bottomAnchor.constraint(equalTo: stackView.topAnchor, constant: -padding),
blurView.trailingAnchor.constraint(equalTo: trailingAnchor, constant: -padding),
blurView.heightAnchor.constraint(equalToConstant: viewHeight)
])
addBlurEffect(for: blurView)
}
private func addBlurEffect(for view: UIView) {
let blurEffect = UIVisualEffectView(effect: UIBlurEffect(style: .dark))
blurEffect.alpha = 0.5
blurEffect.translatesAutoresizingMaskIntoConstraints = false
view.addSubview(blurEffect)
addConstraints([
blurEffect.topAnchor.constraint(equalTo: view.topAnchor),
blurEffect.leadingAnchor.constraint(equalTo: view.leadingAnchor),
blurEffect.bottomAnchor.constraint(equalTo: view.bottomAnchor),
blurEffect.trailingAnchor.constraint(equalTo: view.trailingAnchor)
])
}
private func makeClearHole(rect: CGRect) {
let maskLayer = CAShapeLayer()
maskLayer.fillColor = UIColor.black.cgColor
let pathToOverlay = CGMutablePath()
pathToOverlay.addRect(blurView.bounds)
pathToOverlay.addRect(rect)
maskLayer.path = pathToOverlay
maskLayer.fillRule = .evenOdd
maskLayer.cornerRadius = 10
blurView.layer.mask = maskLayer
}
我正在使用 touchesMoved 方法來更改橙色視圖尺寸:
override func touchesMoved(_ touches: Set<UITouch>, with event: UIEvent?) {
guard trimmerView.isHidden == false else { return }
if let touch = touches.first{
let currentTouchPoint = touch.location(in: self)
let previousTouchPoint = touch.previousLocation(in: self)
let deltaX = currentTouchPoint.x - previousTouchPoint.x
if trimmerView.bounds.width >= 70 {
if touchStartEdge.middle {
if trimmerViewLeadingConstraint.constant < 10 {
trimmerViewLeadingConstraint.constant = 10
} else if trimmerViewTrailingConstraint.constant > -10 {
trimmerViewTrailingConstraint.constant = -10
} else {
trimmerViewLeadingConstraint.constant += deltaX
trimmerViewTrailingConstraint.constant += deltaX
}
}
if touchStartEdge.leftEdge {
if trimmerViewLeadingConstraint.constant >= 10.0 {
trimmerViewLeadingConstraint.constant += deltaX
} else if trimmerViewLeadingConstraint.constant < 10.0 {
trimmerViewLeadingConstraint.constant = 10
}
}
if touchStartEdge.rightEdge {
if trimmerViewTrailingConstraint.constant <= -10 {
trimmerViewTrailingConstraint.constant += deltaX
} else if trimmerViewTrailingConstraint.constant > -10 {
trimmerViewTrailingConstraint.constant = -10.0
}
}
}
updateProgressBarConstraints()
makeClearHole(rect: CGRect(x: 0, y: 0, width: trimmerView.frame.width, height: trimmerView.frame.height))
UIView.animate(withDuration: 0.10, delay: 0, options: .curveEaseIn) { [weak self] in
self?.layoutIfNeeded()
}
}
}
我想要實現的是僅在橙色視圖的范圍內消除模糊效果。
有任何想法嗎 ?? :)
感謝幫助!!
幾種方法可以做到這一點 - 這是一個......
將蒙版添加到模糊效果視圖。 當用戶拖動“修剪器”時,更新蒙版。
這是一個簡單的例子......
出色地:
示例視圖控制器
class TrimmerVC: UIViewController {
var blurView: MaskedBlurView!
let trimmerView = DragView()
let stackView = UIStackView()
override func viewDidLoad() {
super.viewDidLoad()
// respect safe area when we setup constraints
let g = view.safeAreaLayoutGuide
stackView.distribution = .fillEqually
stackView.translatesAutoresizingMaskIntoConstraints = false
view.addSubview(stackView)
NSLayoutConstraint.activate([
stackView.topAnchor.constraint(equalTo: g.topAnchor, constant: 40.0),
stackView.leadingAnchor.constraint(equalTo: g.leadingAnchor, constant: 40.0),
stackView.trailingAnchor.constraint(equalTo: g.trailingAnchor, constant: -40.0),
stackView.heightAnchor.constraint(equalToConstant: 80.0),
])
// let's add 10 imageviews to the stack view
for i in 1...10 {
if let img = UIImage(systemName: "\(i).circle.fill") {
let imgView = UIImageView(image: img)
imgView.backgroundColor = UIColor(white: 0.95, alpha: 1.0)
stackView.addArrangedSubview(imgView)
}
}
let blurEffect = UIBlurEffect(style: .dark)
blurView = MaskedBlurView(effect: blurEffect)
blurView.alpha = 0.5
blurView.translatesAutoresizingMaskIntoConstraints = false
view.addSubview(blurView)
NSLayoutConstraint.activate([
blurView.topAnchor.constraint(equalTo: stackView.topAnchor, constant: 0.0),
blurView.leadingAnchor.constraint(equalTo: stackView.leadingAnchor, constant: 0.0),
blurView.trailingAnchor.constraint(equalTo: stackView.trailingAnchor, constant: 0.0),
blurView.bottomAnchor.constraint(equalTo: stackView.bottomAnchor, constant: 0.0),
])
trimmerView.backgroundColor = .systemOrange
view.addSubview(trimmerView)
trimmerView.didDrag = { [weak self] newX in
guard let self = self else { return }
self.blurView.clearX = newX - self.stackView.frame.origin.x
}
}
// we'll use this to update the framing when the stack view width changes
// such as on device rotation
var curStackW: CGFloat = -1
override func viewDidLayoutSubviews() {
super.viewDidLayoutSubviews()
if curStackW != stackView.frame.width {
curStackW = stackView.frame.width
var r = stackView.frame
r.origin.y += r.size.height + 20.0
r.size.width = 160
r.size.height = 40
trimmerView.frame = r
blurView.clearWidth = trimmerView.frame.width
blurView.clearX = 0
}
}
override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
// toggle the trimmer view between
// below the stack view and
// overlaid on the stack view
if trimmerView.frame.origin.y > stackView.frame.origin.y {
let r = stackView.frame
trimmerView.frame.origin.y = r.origin.y - 6.0
trimmerView.frame.size.height = r.height + 12.0
} else {
let r = stackView.frame
trimmerView.frame.origin.y = r.origin.y + r.height + 12.0
trimmerView.frame.size.height = 60.0
}
}
}
示例可拖動的“修剪器”視圖
class DragView: UIView {
var didDrag: ((CGFloat) -> ())?
let maskLayer = CAShapeLayer()
override init(frame: CGRect) {
super.init(frame: frame)
commonInit()
}
required init?(coder: NSCoder) {
super.init(coder: coder)
commonInit()
}
func commonInit() {
maskLayer.fillColor = UIColor.red.cgColor
layer.mask = maskLayer
}
override func layoutSubviews() {
super.layoutSubviews()
let pathToOverlay = CGMutablePath()
pathToOverlay.addRect(bounds)
pathToOverlay.addRect(bounds.insetBy(dx: 20.0, dy: 8.0))
maskLayer.path = pathToOverlay
maskLayer.fillRule = .evenOdd
maskLayer.cornerRadius = 10
}
var touchStartX: CGFloat = 0
var frameStartX: CGFloat = 0
override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
guard let touch = touches.first else { return }
touchStartX = touch.location(in: self.superview!).x
frameStartX = self.frame.origin.x
}
override func touchesMoved(_ touches: Set<UITouch>, with event: UIEvent?) {
guard let touch = touches.first else { return }
let loc = touch.location(in: self.superview!)
self.frame.origin.x = frameStartX + (loc.x - touchStartX)
didDrag?(self.frame.origin.x)
}
}
蒙版模糊視圖示例
class MaskedBlurView: UIVisualEffectView {
public var clearWidth: CGFloat = 100 {
didSet { updateMask() }
}
public var clearX: CGFloat = 0 {
didSet { updateMask() }
}
private let maskLayer = CAShapeLayer()
override init(effect: UIVisualEffect?) {
super.init(effect: effect)
commonInit()
}
required init?(coder: NSCoder) {
super.init(coder: coder)
commonInit()
}
func commonInit() {
maskLayer.fillColor = UIColor.red.cgColor
layer.mask = maskLayer
}
func updateMask() {
let leftR = CGRect(x: 0, y: 0, width: clearX, height: bounds.height)
let rightR = CGRect(x: clearX + clearWidth, y: 0, width: bounds.width, height: bounds.height)
let bez = UIBezierPath(rect: leftR)
bez.append(UIBezierPath(rect: rightR))
maskLayer.path = bez.cgPath
}
override func layoutSubviews() {
super.layoutSubviews()
maskLayer.frame = bounds
}
}
運行時(橫向),它將像這樣開始:
我將“修剪器”視圖放在堆棧視圖下方,以使其更清楚發生了什么。
當我們拖動修剪器視圖時,模糊視圖的遮罩將被更新:
點擊屏幕空白部分的任意位置將在“堆棧視圖下”和“疊加在堆棧視圖上”之間切換修剪器視圖:
這只是快速組合在一起 - 您應該可以輕松重組代碼以將所有內容包裝到單個自定義視圖中(或者它最適合您的需求)。
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