Swift中通过叠加UILabel实现混合进度条的方法

 // // MixedColorProgressViewController.swift // Swift-Animations // // Created by YouXianMing on 16/8/21. // Copyright © 2016年 YouXianMing. All rights reserved. // import UIKit class MixedColorProgressViewController: NormalTitleViewController { private var upView : UIView! private var upLabel : UILabel! private var downView : UIView! private var downLabel : UILabel! private var timer : GCDTimer! = GCDTimer(inQueue: GCDQueue.mainQueue) override func setup() { super.setup() downView = UIView(frame: CGRectMake(0, 0, 220, 17)) downView.center = (contentView?.middlePoint)! downView.layer.cornerRadius = 2 downView.backgroundColor = UIColor.whiteColor() downView.layer.masksToBounds = true contentView?.addSubview(downView) downLabel = UILabel(frame: downView.bounds) downLabel.font = UIFont.HelveticaNeueThin(12.0) downLabel.text = "YouXianMing - iOS Programmer" downLabel.textColor = UIColor.redColor() downLabel.textAlignment = .Center downView.layer.borderWidth = 0.5 downView.layer.borderColor = UIColor.redColor().CGColor downView.addSubview(downLabel) upView = UIView(frame: CGRectMake(0, 0, 220, 17)) upView.center = (contentView?.middlePoint)! upView.layer.cornerRadius = 2 upView.backgroundColor = UIColor.redColor() upView.layer.masksToBounds = true contentView?.addSubview(upView) upLabel = UILabel(frame: upView.bounds) upLabel.font = UIFont.HelveticaNeueThin(12.0) upLabel.text = "YouXianMing - iOS Programmer" upLabel.textColor = UIColor.whiteColor() upLabel.textAlignment = .Center upView.addSubview(upLabel) weak var wself = self timer.event({ UIView.animateWithDuration(0.5, delay: 0, usingSpringWithDamping: 3, initialSpringVelocity: 0, options: .CurveEaseInOut, animations: { wself?.upView.width = CGFloat(arc4random() % 220) }, completion: nil) }, timeIntervalWithSeconds: 1, delayWithSeconds: 1) timer.start() } }