运行效果.gif
上面分享的文章中有一小部分代码随着Swift版本的更新失效了，不过大部分还是非常好用的，下面将本人根据上面的文章写得实际使用UIAlertController的代码展示给大家，本文只
提供Swift版本的使用方式，有使用OC的课移步参考文章
话不多说，上代码。
// MARK: - 默认样式，注意：Swift中必须声明是iOS8.0以上才执行UIAlertController相关的代码，否则会报错
if #available(iOS 8.0, *)
{
let alertController = UIAlertController(title: "提示", message: "这个是UIAlertController的默认样式", preferredStyle: UIAlertControllerStyle.Alert)
let cancelAction = UIAlertAction(title: "取消", style: UIAlertActionStyle.Cancel, handler: nil)
let okAction = UIAlertAction(title: "好的", style: UIAlertActionStyle.Default, handler: nil)
alertController.addAction(cancelAction)
alertController.addAction(okAction)
self.presentViewController(alertController, animated: true, completion: nil)
} else {
// Fallback on earlier versions
}
// MARK: - 警示样式
if #available(iOS 8.0, *) {
let alertController = UIAlertController(title: "订单", message: "这个是UIAlertController的警示样式", preferredStyle: UIAlertControllerStyle.Alert)
let cancelAction = UIAlertAction(title: "取消", style: UIAlertActionStyle.Cancel, handler: nil)
let okAction = UIAlertAction(title: "警示", style: UIAlertActionStyle.Destructive, handler: nil)
alertController.addAction(cancelAction)
alertController.addAction(okAction)
self.presentViewController(alertController, animated: true, completion: nil)
} else {
// Fallback on earlier versions
}
// MARK: - 文本对话框
if #available(iOS 8.0, *) {
let alertController = UIAlertController(title: "优惠", message: "这个是UIAlertController的文本对话框", preferredStyle: UIAlertControllerStyle.Alert)
alertController.addTextFieldWithConfigurationHandler({ (textField: UITextField!) -> Void in
textField.placeholder = "登录"
// 添加监听代码，监听文本框变化时要做的操作
NSNotificationCenter.defaultCenter().addObserver(self, selector: Selector("alertTextFieldDidChange:"), name: UITextFieldTextDidChangeNotification, object: textField)
})
alertController.addTextFieldWithConfigurationHandler({ (textField: UITextField!) -> Void in
textField.placeholder = "密码"
textField.secureTextEntry = true
})
let cancelAction = UIAlertAction(title: "取消", style: UIAlertActionStyle.Cancel, handler: nil)
let okAction = UIAlertAction(title: "好的", style: UIAlertActionStyle.Default , handler: { (action: UIAlertAction!) -> Void in
let login = (alertController.textFields?.first)! as UITextField
let password = (alertController.textFields?.last)! as UITextField
print("loginStr===\(login.text)，passWordStr===\(password.text)")
NSNotificationCenter.defaultCenter().removeObserver(self, name: UITextFieldTextDidChangeNotification, object: nil)
})
okAction.enabled = false
alertController.addAction(cancelAction)
alertController.addAction(okAction)
self.presentViewController(alertController, animated: true, completion: nil)
} else {
// Fallback on earlier versions
}
// MARK: - 用户名长度超过3个字符才可以点击“好的”按钮，好了，现在对话框的“好的”按钮被冻结了，除非在“登录”文本框中输入3个以上的字符：
func alertTextFieldDidChange(notification: NSNotification){
if #available(iOS 8.0, *) {
let alertController = self.presentedViewController as! UIAlertController?
if (alertController != nil) {
let login = (alertController!.textFields?.first)! as UITextField
let okAction = alertController!.actions.last! as UIAlertAction
if login.text?.lengthOfBytesUsingEncoding(NSUTF8StringEncoding) > 3 {
okAction.enabled = true
} else {
okAction.enabled = false
}
}
} else {
// Fallback on earlier versions
}
}
// MARK: - 上拉菜单
if #available(iOS 8.0, *) {
let alertController = UIAlertController(title: "保存或删除数据", message: "删除数据将不可恢复", preferredStyle: UIAlertControllerStyle.ActionSheet)
// 如果上拉菜单中有“取消”按钮的话，那么它永远都会出现在菜单的底部，不管添加的次序是如何（就是这么任性）。其他的按钮将会按照添加的次序从上往下依次显示
let cancelAction = UIAlertAction(title: "取消", style: UIAlertActionStyle.Cancel, handler: nil)
let deleteAction = UIAlertAction(title: "删除", style: UIAlertActionStyle.Destructive, handler: nil)
let archiveAction = UIAlertAction(title: "保存", style: UIAlertActionStyle.Default, handler: nil)
alertController.addAction(cancelAction)
alertController.addAction(deleteAction)
alertController.addAction(archiveAction)
self.presentViewController(alertController, animated: true, completion: nil)
} else {
// Fallback on earlier versions
}
这是小编最近在写的下厨房Swift高仿版的一部分，有兴趣的可移步GitHub
