一款自定义的提示框JHToast（swift）

iOS的风格和Apple其他产品一样，简单而粗暴。没有给人其他选择的余地，让你又爱又恨。同样的，Apple对待iOS平台的开发人员和对待大众消费者一样，也不给你留余地。UIAlertView就是一个鲜明标志。功能简单，甚至单一，定制性差，消耗资源。在资源紧张的设备上，UIAlertView的动画效果都会稍微卡一下，很是别扭。

这时还是很希望在iOS上有一个Android风格的Toast控件。

我制作了一个demo，使用起来感觉效果还是很不错的，简单易用，在这里和大家分享一下。（swift3.0）

import UIKitenum JHToastShowType {    case JHToastShowTypeTop,    JHToastShowTypeCenter,    JHToastShowTypeBottom}let kDefaultForwardAnimationDuration:CFTimeInterval = 0.5let kDefaultBackwardAnimationDuration:CFTimeInterval = 0.5let kDefautlWaitAnimationDuration:CFTimeInterval = 1.0let kDefaultTopMargin:CGFloat = 70let kDefaultTextInset:CGFloat = 12class JHToast: UILabel,CAAnimationDelegate {    private var forwardAnimationDuration : CFTimeInterval!    private var backwardAnimationDuration : CFTimeInterval!    private var textInsets : UIEdgeInsets!    private var maxWidth : CGFloat!    override func awakeFromNib() {        super.awakeFromNib()    }    override init(frame: CGRect) {        super.init(frame: frame)        self.forwardAnimationDuration = kDefaultForwardAnimationDuration        self.backwardAnimationDuration = kDefaultBackwardAnimationDuration        self.textInsets = UIEdgeInsetsMake(kDefaultTextInset, kDefaultTextInset, kDefaultTextInset, kDefaultTextInset)        self.maxWidth = UIScreen.main.bounds.size.width - 20        self.layer.cornerRadius = 5        self.layer.masksToBounds = true        self.backgroundColor = UIColor.black.withAlphaComponent(0.6)        self.numberOfLines = 0        self.textAlignment = .center        self.textColor = UIColor.white        self.font = UIFont.systemFont(ofSize: 13.0)    }    required init?(coder aDecoder: NSCoder) {        super.init(coder: aDecoder)        fatalError("init(coder:) has not been implemented")    }    func showToast(text:String, type:JHToastShowType) {        self.text = text        self.sizeToFit()        self.showType(type: type)    }    private func showType(type:JHToastShowType) {        let keyWindow = UIApplication.shared.delegate?.window        self.addAnimationGroup()        var point = keyWindow??.center        switch type {        case .JHToastShowTypeTop:            point?.y = kDefaultTopMargin            break        case .JHToastShowTypeCenter:            break        case .JHToastShowTypeBottom:            point?.y = (keyWindow??.bounds.size.height)! - kDefaultTopMargin            break        }        self.center = point!        keyWindow??.addSubview(self)    }    /**  Animation  */    private func addAnimationGroup() {        let forwardAnimation = CABasicAnimation.init(keyPath: "transform.scale")        forwardAnimation.duration = self.forwardAnimationDuration        forwardAnimation.timingFunction = CAMediaTimingFunction.init(controlPoints: 0.5, 1.7, 0.6, 0.85)        forwardAnimation.fromValue = NSNumber.init(value: 0.0)        forwardAnimation.toValue = NSNumber.init(value: 1.0)        let backwardAnimation = CABasicAnimation.init(keyPath: "transform.scale")        backwardAnimation.duration = self.backwardAnimationDuration        backwardAnimation.beginTime = forwardAnimation.duration + kDefautlWaitAnimationDuration        backwardAnimation.timingFunction = CAMediaTimingFunction.init(controlPoints: 0.4, 0.15, 0.5, -0.7)        backwardAnimation.fromValue = NSNumber.init(value: 1.0)        backwardAnimation.toValue = NSNumber.init(value: 0.0)        let animationGroup = CAAnimationGroup()        animationGroup.animations = [forwardAnimation,backwardAnimation]        animationGroup.duration = forwardAnimation.duration + backwardAnimation.duration + kDefautlWaitAnimationDuration        animationGroup.isRemovedOnCompletion = false        animationGroup.delegate = self        animationGroup.fillMode = kCAFillModeForwards        self.layer.add(animationGroup, forKey: "customShow")    }    func animationDidStop(_ anim: CAAnimation, finished flag: Bool) {        if flag {            self.removeFromSuperview()            self.layer.removeAnimation(forKey: "customShow")        }    }    /**  text  */    override func sizeToFit() {        super.sizeToFit()        var frame = self.frame        let width = self.bounds.size.width + self.textInsets.left + self.textInsets.right        frame.size.width = min(width, self.maxWidth)        frame.size.height = self.bounds.size.height + self.textInsets.top + self.textInsets.bottom        self.frame = frame    }    override func draw(_ rect: CGRect) {        super.drawText(in: UIEdgeInsetsInsetRect(rect, self.textInsets))    }    override func textRect(forBounds bounds: CGRect, limitedToNumberOfLines numberOfLines: Int) -> CGRect {        let size = self.text?.boundingRect(            with: CGSize.init(width:  CGFloat.greatestFiniteMagnitude, height: CGFloat.greatestFiniteMagnitude),            options: .usesLineFragmentOrigin,            attributes: [NSFontAttributeName:self.font],            context:nil).size        let bound = CGRect.init(origin: bounds.origin, size: size!)        return bound    }}

Github上有完整代码，喜欢的给颗星哦，谢谢！
下载代码JHToast