swift中UIActionSheet的使用

// 方法1
let alertSheet = UIActionSheet(title: alertTitle, delegate: nil, cancelButtonTitle: alertOK, destructiveButtonTitle: alertCancel)
alertSheet.showInView(self.view)

// 方法2
// 实例化时添加代理对象，同时注意添加协议
let alertSheet = UIActionSheet(title: alertTitle, delegate: self, cancelButtonTitle: alertOK, destructiveButtonTitle: alertCancel, otherButtonTitles: "警告", "提示", "通告")
alertSheet.showInView(self.view)

// 添加协议
class ViewController: UIViewController, UIActionSheetDelegate {

override func viewDidLoad() {
...
}
...
}

// 代理方法
// MARK: UIActionSheetDelegate
func actionSheet(actionSheet: UIActionSheet, clickedButtonAtIndex buttonIndex: Int) {
let buttonTitle = actionSheet.buttonTitleAtIndex(buttonIndex)
if buttonTitle == alertCancel
{
print("你点击了退出")
}
else if buttonTitle == alertOK
{
print("你点击了确定")
}
else
{
print("你点击了其他")
}
}

// 方法3
// 1 实例化
let alertSheet = UIAlertController(title: alertTitle, message: alertMessage, preferredStyle: UIAlertControllerStyle.ActionSheet)
// 2 命令（样式：退出Cancel，警告Destructive-按钮标题为红色，默认Default）
let cancelAction = UIAlertAction(title: alertCancel, style: UIAlertActionStyle.Cancel, handler: nil)
let deleteAction = UIAlertAction(title: "删除", style: UIAlertActionStyle.Destructive, handler: nil)
let archiveAction = UIAlertAction(title: alertOK, style: UIAlertActionStyle.Default, handler: {
action in
print("OK")
})
alertSheet.addAction(cancelAction)
alertSheet.addAction(deleteAction)
alertSheet.addAction(archiveAction)
// 3 跳转
self.presentViewController(alertSheet, animated: true, completion: nil)