9. UIActionSheet

UIActionSheet

UIActionSheet和UIAlertView非常类似, 我们将学习如何使用它

1.UIActionSheet创建

import UIKitclass ViewController: UIViewController, UIActionSheetDelegate {    override func viewDidLoad() {        super.viewDidLoad()        // Do any additional setup after loading the view.        let actionSheet = UIActionSheet()        actionSheet.title = "烦恼"        actionSheet.addButtonWithTitle("钱解决")        actionSheet.addButtonWithTitle("更多钱解决")        actionSheet.addButtonWithTitle("取消")        actionSheet.cancelButtonIndex = 2        actionSheet.delegate = self        actionSheet.showInView(self.view)    }    override func didReceiveMemoryWarning() {        super.didReceiveMemoryWarning()        // Dispose of any resources that can be recreated.    }}

运行程序:

注意:
查看UIActionSheet的定义,我们发现, UIActionSheet的显示方式有多种,如在UIToolbar上显示,在UITabBar上显示, 在UIBarButtonItem上显示,和指定的UIView上显示,具体看下面的方法:

public func showFromToolbar(view: UIToolbar)public func showFromTabBar(view: UITabBar)@available(iOS 3.2, *)public func showFromBarButtonItem(item: UIBarButtonItem, animated: Bool)@available(iOS 3.2, *)public func showFromRect(rect: CGRect, inView view: UIView, animated: Bool)public func showInView(view: UIView)

设置标题看起来好low,还不如没有!

2. UIActionSheetDelegate

查看一个UIActionSheetDelegate的定义

public protocol UIActionSheetDelegate : NSObjectProtocol {    // 有按钮被点击的时候调用    @available(iOS, introduced=2.0, deprecated=8.3)    optional public func actionSheet(actionSheet: UIActionSheet, clickedButtonAtIndex buttonIndex: Int)    // 操作表显示时,应用突然关闭时调用(如用户俺下了home键)    // 注意,按下cancle是不会调用此方法的    @available(iOS, introduced=2.0, deprecated=8.3)    optional public func actionSheetCancel(actionSheet: UIActionSheet)    @available(iOS, introduced=2.0, deprecated=8.3)    optional public func willPresentActionSheet(actionSheet: UIActionSheet) // 显示前被调用    @available(iOS, introduced=2.0, deprecated=8.3)    optional public func didPresentActionSheet(actionSheet: UIActionSheet) // 显示后被调用    @available(iOS, introduced=2.0, deprecated=8.3)    optional public func actionSheet(actionSheet: UIActionSheet, willDismissWithButtonIndex buttonIndex: Int) // 隐藏前被调用    @available(iOS, introduced=2.0, deprecated=8.3)    optional public func actionSheet(actionSheet: UIActionSheet, didDismissWithButtonIndex buttonIndex: Int) // 隐藏后被调用}

现在我们实现一个需求:
我们点击了哪个按钮, 就在控制台打印出它对应的索引和标题

// MARK: - UIActionSheetDelegate    func actionSheet(actionSheet: UIActionSheet, clickedButtonAtIndex buttonIndex: Int) {        print("click index: \(buttonIndex), title is \(actionSheet.buttonTitleAtIndex(buttonIndex))")    }

运行程序,每个按钮都点击一下,可以在控制台中看见如下结果:

click index: 0, title is Optional("钱解决")click index: 1, title is Optional("更多钱解决")click index: 2, title is Optional("取消")

3. 完整代码:

import UIKitclass ViewController: UIViewController, UIActionSheetDelegate {    override func viewDidLoad() {        super.viewDidLoad()        // Do any additional setup after loading the view.        let actionSheet = UIActionSheet()        actionSheet.title = "烦恼"        actionSheet.addButtonWithTitle("钱解决")        actionSheet.addButtonWithTitle("更多钱解决")        actionSheet.addButtonWithTitle("取消")        actionSheet.cancelButtonIndex = 2        actionSheet.delegate = self        actionSheet.showInView(self.view)    }    // MARK: - UIActionSheetDelegate    func actionSheet(actionSheet: UIActionSheet, clickedButtonAtIndex buttonIndex: Int) {        print("click index: \(buttonIndex), title is \(actionSheet.buttonTitleAtIndex(buttonIndex))")    }    override func didReceiveMemoryWarning() {        super.didReceiveMemoryWarning()        // Dispose of any resources that can be recreated.    }}