替换UIAlertView、UIAlertController

UIAlertView是iOS9开始不建议使用了，UIAlertController是iOS8提倡使用，但是这两个风格可能都不是自己想要的，那么下面介绍如何自定义一款

////  TGActionSheet.swift//  TGPhotoPicker////  Created by targetcloud on 2017/8/13.//  Copyright © 2017年 targetcloud. All rights reserved.//import UIKitfileprivate let TGActionSheetCancelTag = 1999fileprivate let TGActionSheetBaseTag = 1000fileprivate let TGActionSheetAnimationDuration: TimeInterval = 0.25protocol TGActionSheetDelegate: NSObjectProtocol {    func actionSheet(actionSheet: TGActionSheet?, didClickedAt index: Int)}class TGActionSheet: UIView {    weak var delegate: TGActionSheetDelegate?        fileprivate lazy var btnArr: [UIButton] = [UIButton]()        fileprivate lazy var dividerArr: [UIView] = [UIView]()        fileprivate lazy var coverView: UIView = { [unowned self] in        let coverView = UIView()        coverView.backgroundColor = UIColor(white: 0, alpha: 0.3)        coverView.addGestureRecognizer(UITapGestureRecognizer(target: self, action: #selector(coverViewDidClick)))        return coverView    }()        fileprivate lazy var actionSheet: UIView = {        let actionSheet = UIView()        actionSheet.backgroundColor = .clear        return actionSheet    }()        fileprivate lazy var cancelBtn: UIButton = {        let cancelBtn = UIButton(type: .custom)        cancelBtn.tag = TGActionSheetCancelTag        cancelBtn.backgroundColor = UIColor(white: 1, alpha: 1)        cancelBtn.titleLabel?.textAlignment = .center        cancelBtn.titleLabel?.font = UIFont.systemFont(ofSize: TGPhotoPickerConfig.shared.fontSize)        cancelBtn.setTitleColor(.darkGray, for: .normal)        cancelBtn.addTarget(self, action: #selector(actionSheetClicked(_:)), for: .touchUpInside)        return cancelBtn    }()        class func showActionSheet(with delegate: TGActionSheetDelegate?,  cancelTitle: String, otherTitles: [String]) -> TGActionSheet {        return TGActionSheet(delegate: delegate, cancelTitle: cancelTitle, otherTitles: otherTitles)    }        override init(frame: CGRect) {        super.init(frame: frame)    }        init(delegate: TGActionSheetDelegate?, cancelTitle: String, otherTitles: [String]) {        super.init(frame: CGRect.zero)        btnArr.removeAll()        dividerArr.removeAll()        self.backgroundColor = .clear        self.delegate = delegate        self.addSubview(coverView)        self.coverView.addSubview(actionSheet)        for i in 0..<otherTitles.count {            self.createBtn(with: otherTitles[i], bgColor: UIColor(white: 1, alpha: 1), titleColor: .darkGray, tagIndex: i + TGActionSheetBaseTag)        }        cancelBtn.setTitle(cancelTitle, for: .normal)        self.actionSheet.addSubview(cancelBtn)    }        required init?(coder aDecoder: NSCoder) {        fatalError("init(coder:) has not been implemented")    }    fileprivate func createBtn(with title: String?, bgColor: UIColor?, titleColor: UIColor?, tagIndex: Int) {        let actionBtn = UIButton(type: .custom)        actionBtn.tag = tagIndex        actionBtn.titleLabel?.font = UIFont.systemFont(ofSize: TGPhotoPickerConfig.shared.fontSize)        actionBtn.backgroundColor = bgColor        actionBtn.titleLabel?.textAlignment = .center        actionBtn.setTitle(title, for: .normal)        actionBtn.setTitleColor(titleColor, for: .normal)        actionBtn.addTarget(self, action: #selector(actionSheetClicked(_:)), for: .touchUpInside)        self.actionSheet.addSubview(actionBtn)        self.btnArr.append(actionBtn)                let divider = UIView()        divider.backgroundColor = UIColor.hexInt(0xebebeb)        actionBtn.addSubview(divider)        dividerArr.append(divider)    }    @objc fileprivate func coverViewDidClick() {        self.dismiss()    }        @objc fileprivate func actionSheetClicked(_ btn: UIButton) {        if btn.tag != TGActionSheetCancelTag {            self.delegate?.actionSheet(actionSheet: self, didClickedAt: btn.tag - TGActionSheetBaseTag)            self.dismiss()        } else {            self.dismiss()        }    }        func show() {        if self.superview != nil { return }                let keyWindow = UIApplication.shared.keyWindow        self.frame = (keyWindow?.bounds)!        keyWindow?.addSubview(self)                coverView.frame = CGRect(x: 0, y: 0, width: TGPhotoPickerConfig.ScreenW, height: TGPhotoPickerConfig.ScreenH)                let actionH = CGFloat(self.btnArr.count + 1) * TGPhotoPickerConfig.shared.toolBarH + 5.0        actionSheet.frame = CGRect(x: 0, y: self.frame.height, width: TGPhotoPickerConfig.ScreenW, height: actionH)                cancelBtn.frame = CGRect(x: 0, y: actionH - TGPhotoPickerConfig.shared.toolBarH, width: self.frame.width, height: TGPhotoPickerConfig.shared.toolBarH)                let btnW: CGFloat = self.frame.width        let btnH: CGFloat = TGPhotoPickerConfig.shared.toolBarH        let btnX: CGFloat = 0        var btnY: CGFloat = 0        for i in 0..<btnArr.count {            let btn = btnArr[i]            let divider = dividerArr[i]            btnY = TGPhotoPickerConfig.shared.toolBarH * CGFloat(i)            btn.frame = CGRect(x: btnX, y: btnY, width: btnW, height: btnH)            divider.frame = CGRect(x: btnX, y: btnH - 1, width: btnW, height: 1)        }                UIView.animate(withDuration: TGActionSheetAnimationDuration) {            self.actionSheet.frame.origin.y = self.frame.height - self.actionSheet.frame.height        }    }        fileprivate func dismiss() {        UIView.animate(withDuration: TGActionSheetAnimationDuration, animations: {            self.actionSheet.frame.origin.y = self.frame.height        }) { (_) in            if self.superview != nil {                self.removeFromSuperview()            }        }    }}

使用时实现其代理方法即可

extension TGPhotoPicker: TGActionSheetDelegate {    func actionSheet(actionSheet: TGActionSheet?, didClickedAt index: Int) {        switch index {        case 0:            //your code        case 1:    
            //your code
 default: break } }}

效果如下

完整应用DEMO见https://github.com/targetcloud/TGPhotoPicker