79 lines
2.4 KiB
Swift
79 lines
2.4 KiB
Swift
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final class MediaLoaderView : UIView {
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private let bar = UIView()
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private lazy var barLeftConstraint = bar.pin(.left, to: .left, of: self)
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private lazy var barRightConstraint = bar.pin(.right, to: .right, of: self)
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// MARK: Lifecycle
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override init(frame: CGRect) {
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super.init(frame: frame)
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setUpViewHierarchy()
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}
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required init?(coder: NSCoder) {
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super.init(coder: coder)
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setUpViewHierarchy()
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}
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private func setUpViewHierarchy() {
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bar.backgroundColor = Colors.accent
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bar.set(.height, to: 8)
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addSubview(bar)
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barLeftConstraint.isActive = true
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bar.pin(.top, to: .top, of: self)
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barRightConstraint.isActive = true
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bar.pin(.bottom, to: .bottom, of: self)
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step1()
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}
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// MARK: Animation
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func step1() {
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barRightConstraint.constant = -bounds.width
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UIView.animate(withDuration: 0.5, animations: { [weak self] in
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guard let self = self else { return }
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self.barRightConstraint.constant = 0
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self.layoutIfNeeded()
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}, completion: { [weak self] _ in
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self?.step2()
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})
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}
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func step2() {
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barLeftConstraint.constant = 0
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UIView.animate(withDuration: 0.5, animations: { [weak self] in
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guard let self = self else { return }
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self.barLeftConstraint.constant = self.bounds.width
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self.layoutIfNeeded()
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}, completion: { [weak self] _ in
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Timer.scheduledTimer(withTimeInterval: 0.25, repeats: false) { _ in
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self?.step3()
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}
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})
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}
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func step3() {
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barLeftConstraint.constant = bounds.width
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UIView.animate(withDuration: 0.5, animations: { [weak self] in
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guard let self = self else { return }
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self.barLeftConstraint.constant = 0
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self.layoutIfNeeded()
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}, completion: { [weak self] _ in
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self?.step4()
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})
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}
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func step4() {
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barRightConstraint.constant = 0
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UIView.animate(withDuration: 0.5, animations: { [weak self] in
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guard let self = self else { return }
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self.barRightConstraint.constant = -self.bounds.width
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self.layoutIfNeeded()
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}, completion: { [weak self] _ in
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Timer.scheduledTimer(withTimeInterval: 0.25, repeats: false) { _ in
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self?.step1()
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}
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})
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}
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}
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