swift3.0 一个屏幕下方灰色提示条

来源：互联网发布：js exec 编辑：程序博客网时间：2024/04/28 05:43

提示条效果

import UIKitclass PromptView: UIView {    /// 显示提示文字    ///    /// - Parameter text: 显示的文字    public class func show(text: String) {        PromptView.share.textDidSet(text: text)    }    /// 显示提示文字并收起键盘    ///    /// - Parameters:    ///   - text: 显示的文字    ///   - hideKeyboardView: 需要收起键盘的view    public class func show(text: String, hideKeyboardView: UIView) {        hideKeyboardView.endEditing(true)        PromptView.share.textDidSet(text: text)    }    private override init(frame: CGRect) {        super.init(frame: frame)        loadView()    }    required init?(coder aDecoder: NSCoder) {        fatalError("init(coder:) has not been implemented")    }    // MARK: >> 属性定义    private static let share = PromptView()    fileprivate var promptView = UIView()    fileprivate var promptLabel = UILabel()    fileprivate var timer: DispatchSourceTimer?    // MARK: >> 常量定义    fileprivate let padding: CGFloat = 80    fileprivate let screenPadding: CGFloat = 80    fileprivate let height: CGFloat = 40    fileprivate let fontsize: CGFloat = 15    fileprivate let backAlpha: CGFloat = 0.7}// MARK: >> 初始化fileprivate extension PromptView {    fileprivate func loadView() {        loadSelf()        loadPrompt()    }    private func loadSelf() {        layer.cornerRadius = 5        clipsToBounds = true        isUserInteractionEnabled = false        alpha = 0    }    private func loadPrompt() {        promptView.alpha = backAlpha        promptView.backgroundColor = UIColor.black        promptLabel.textAlignment = .center        promptLabel.font = UIFont.systemFont(ofSize: fontsize)        promptLabel.textColor = UIColor.white        addSubview(promptView)        addSubview(promptLabel)        UIApplication.shared.keyWindow?.addSubview(self)    }}// MARK: >> 刷新控件fileprivate extension PromptView {    fileprivate func textDidSet(text: String) {        reloadView(text: text)        refreshTimer()    }    // MARK: >> 更新view    private func reloadView(text: String) {        promptLabel.text = text        let sz = text.rect(fontsize: fontsize, size: CGSize(width: screenWidth - screenPadding, height: 100))        UIView.animate(withDuration: 0.2) {            self.alpha = 1        }        frame = CGRect(x: 0, y: screenHeight-140, width: sz.width + padding, height: height)        center = CGPoint(x: screenWidth/2, y: center.y)        promptLabel.frame = CGRect(x: 0, y: 0, width: sz.width + padding, height: height)        promptView.frame = promptLabel.bounds        UIApplication.shared.keyWindow?.bringSubview(toFront: self)    }    // MARK: >> 刷新timer    private func refreshTimer() {        timer?.cancel()        timer = DispatchSource.makeTimerSource(flags: [], queue: DispatchQueue.main)        timer?.scheduleRepeating(wallDeadline: .now(), interval: .seconds(1))        var timerTime = 3        timer?.setEventHandler {            if timerTime<=0 {                UIView.animate(withDuration: 0.2) {                    self.alpha = 0                }                self.timer?.cancel()            }            timerTime-=1        }        timer?.resume()    }}

报错请添加这个extension

import UIKitextension String {    func rect(fontsize:CGFloat, size: CGSize) -> CGSize {        let string = self as NSString        return string.boundingRect(with: size, options: .usesLineFragmentOrigin, attributes: [NSFontAttributeName: UIFont.systemFont(ofSize: fontsize)], context: nil).size    }}

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