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Pods/ZLPhotoBrowser/Sources/General/ZLProgressView.swift

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+//
+//  ZLProgressView.swift
+//  ZLPhotoBrowser
+//
+//  Created by long on 2020/8/13.
+//
+//  Copyright (c) 2020 Long Zhang <495181165@qq.com>
+//
+//  Permission is hereby granted, free of charge, to any person obtaining a copy
+//  of this software and associated documentation files (the "Software"), to deal
+//  in the Software without restriction, including without limitation the rights
+//  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+//  copies of the Software, and to permit persons to whom the Software is
+//  furnished to do so, subject to the following conditions:
+//
+//  The above copyright notice and this permission notice shall be included in
+//  all copies or substantial portions of the Software.
+//
+//  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+//  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+//  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+//  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+//  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+//  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+//  THE SOFTWARE.
+
+import UIKit
+
+class ZLProgressView: UIView {
+    
+    private lazy var progressLayer: CAShapeLayer = {
+        let layer = CAShapeLayer()
+        layer.fillColor = UIColor.clear.cgColor
+        layer.strokeColor = UIColor.white.cgColor
+        layer.lineCap = .round
+        layer.lineWidth = 4
+        return layer
+    }()
+    
+    var progress: CGFloat = 0 {
+        didSet {
+            self.setNeedsDisplay()
+        }
+    }
+    
+    override init(frame: CGRect) {
+        super.init(frame: frame)
+        
+        backgroundColor = .clear
+        layer.addSublayer(progressLayer)
+    }
+    
+    @available(*, unavailable)
+    required init?(coder: NSCoder) {
+        fatalError("init(coder:) has not been implemented")
+    }
+    
+    override func draw(_ rect: CGRect) {
+        let center = CGPoint(x: rect.width / 2, y: rect.height / 2)
+        let radius = rect.width / 2
+        let end = -(.pi / 2) + (.pi * 2 * progress)
+        progressLayer.frame = bounds
+        let path = UIBezierPath(arcCenter: center, radius: radius, startAngle: -(.pi / 2), endAngle: end, clockwise: true)
+        progressLayer.path = path.cgPath
+    }
+    
+}