swift Toast

模仿Android toast 写的 Swift 版Toast，支持自动换行。

//
//  Created by 谭尧 on 2021/7/20.
//import Foundation
import UIKitclass Toast {private static var INSTANCE:Toast? = nilpublic static func  makeText(_ text:String)->Toast{if INSTANCE == nil {INSTANCE = Toast()}INSTANCE!.toastText = textreturn INSTANCE!}private let window = UIApplication.shared.windows.first!private let contentView = UIView()private let lableToast = UILabel(frame: CGRect(x: 0, y: 0, width: 240, height: 40))private var toastText = ""private init(){lableToast.text = ""lableToast.textAlignment = .centerlableToast.textColor = .blacklableToast.backgroundColor = .clearlableToast.numberOfLines = 0contentView.frame = lableToast.framecontentView.backgroundColor = .whitecontentView.layer.cornerRadius = 12contentView.layer.borderColor = UIColor.lightGray.cgColorcontentView.layer.borderWidth = 1contentView.center = CGPoint(x: window.center.x, y: window.center.y*7/5)contentView.addSubview(lableToast)}private var timer:DispatchSourceTimer? = nilfunc show(showTimeSec:Int = 3){if timer != nil {hide()}var w = CGFloat(16)*1.2 * CGFloat(toastText.count), h = CGFloat(40)if w > 240 {w = 240h = 70}lableToast.frame.size = CGSize(width: w, height: h)contentView.frame.size = lableToast.frame.sizecontentView.center.x = window.center.xlableToast.text = toastTextcontentView.alpha = 0.0window.addSubview(contentView)easyIn()timer = DispatchSource.makeTimerSource(flags: .strict, queue: DispatchQueue.main)timer?.schedule(deadline: .now() + .seconds(showTimeSec))timer?.setEventHandler(handler: {self.hide()})timer?.resume()}@objc private func hide(){self.contentView.removeFromSuperview()self.timer?.cancel()self.timer = nil}private func easyIn(){UIView.beginAnimations(nil, context: nil)UIView.setAnimationCurve(.easeIn)UIView.setAnimationDuration(0.2)contentView.alpha = 1.0UIView.commitAnimations()}
}

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