停止Segue并显示警报部分不起作用-Xcode [英] Stop Segue and show alert partially not working - Xcode
问题描述
我先前遇到了一个问题,即如果textFields为空,则停止segue并显示警报。这个问题解决了。我现在想通过一些逻辑测试来进一步运行这些文本字段的内容。但是,我的代码似乎没发现错误。代码如下:
I earlier had an issue with stopping the segue and showing an alert if the textFields were empty. That problem is solved. I now want to further run the content of these textfields through a few logical tests. However, my code doesn't seem to be catching the errors. Code as follows:
import Foundation
import UIKit
import Darwin
class View3on3 : UIViewController, UITextFieldDelegate {
@IBOutlet weak var APTeams: UITextField!
@IBOutlet weak var APRounds: UITextField!
@IBOutlet weak var APBreakers: UITextField!
override func viewDidLoad()
{
super.viewDidLoad()
initializeTextFields()
}
func initializeTextFields()
{
APTeams.delegate = self
APTeams.keyboardType = UIKeyboardType.NumberPad
APRounds.delegate = self
APRounds.keyboardType = UIKeyboardType.NumberPad
APBreakers.delegate = self
APBreakers.keyboardType = UIKeyboardType.NumberPad
}
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
if (APTeams.text!.isEmpty || APRounds.text!.isEmpty || APBreakers.text!.isEmpty)
{
let alertController: UIAlertController = UIAlertController(
title: "Data missing!",
message: "Please enter valid data into all 3 fields.",
preferredStyle: UIAlertControllerStyle.Alert)
let okAction = UIAlertAction(
title: "OK",
style: UIAlertActionStyle.Default,
handler: nil)
alertController.addAction(okAction)
presentViewController(alertController, animated: true, completion: nil)
}
else if (Int(String(APTeams.text)) < Int(String(APBreakers.text)))
{
let alertController: UIAlertController = UIAlertController(
title: "Math Error!",
message: "The number of breaking teams cannot be more than the number of teams.",
preferredStyle: UIAlertControllerStyle.Alert)
let okAction = UIAlertAction(
title: "OK",
style: UIAlertActionStyle.Default,
handler: nil)
alertController.addAction(okAction)
presentViewController(alertController, animated: true, completion: nil)
}
else if (Int(String(APTeams.text)) > 9999)
{
let alertController: UIAlertController = UIAlertController(
title: "Math Error!",
message: "Please input a number of teams less than 10,000.",
preferredStyle: UIAlertControllerStyle.Alert)
let okAction = UIAlertAction(
title: "OK",
style: UIAlertActionStyle.Default,
handler: nil)
alertController.addAction(okAction)
presentViewController(alertController, animated: true, completion: nil)
}
else
{
let DestViewController : View3on3Results = segue.destinationViewController as! View3on3Results
DestViewController.AP1 = APTeams.text!
DestViewController.AP2 = APRounds.text!
DestViewController.AP3 = APBreakers.text!
//self.performSegueWithIdentifier("segueTest",sender: View3on3Results.self)//
}
}
}
有人知道吗?非空字段的第一个测试工作正常,如果3个textField中的任何一个为空,则抛出错误。
Anyone know what's up? The first test for non-empty fields is working fine and throws an error if any of the 3 textFields are empty.
此外,如果有人知道如何测试以确保这些条目仅包含整数,不胜感激。那是我测试整数值之前需要进行的第二次测试。
Also, if anyone knows how to test to make sure the entries contain integers only, that'd be much appreciated. That's the second test I need to run before testing for the value of the integers.
附录:我正在使用XCode 7 beta 4,是用Swift 2.0编写的。
Addendum: I'm using XCode 7 beta 4, writing in Swift 2.0.
编辑:我的代码现在看起来像这样,现在segue发生了,根本没有检查。
My code now looks like this, and now the segue just happens without checking at all.
@derdida尝试按照您所说的做。这次袭击只是在没有检查任何条件的情况下发生的。
@derdida Tried to follow what you said. The segue just happened without checking any of the conditions. Could you correct my updated code?
func checkIfPassed() {
if (APTeams.text!.isEmpty || APRounds.text!.isEmpty || APBreakers.text!.isEmpty)
{
let alertController: UIAlertController = UIAlertController(
title: "Data missing!",
message: "Please enter valid data into all 3 fields.",
preferredStyle: UIAlertControllerStyle.Alert)
let okAction = UIAlertAction(
title: "OK",
style: UIAlertActionStyle.Default,
handler: nil)
alertController.addAction(okAction)
presentViewController(alertController, animated: true, completion: nil)
}
else if (Int(String(APTeams.text)) < Int(String(APBreakers.text)))
{
let alertController: UIAlertController = UIAlertController(
title: "Math Error!",
message: "The number of breaking teams cannot be more than the number of teams.",
preferredStyle: UIAlertControllerStyle.Alert)
let okAction = UIAlertAction(
title: "OK",
style: UIAlertActionStyle.Default,
handler: nil)
alertController.addAction(okAction)
presentViewController(alertController, animated: true, completion: nil)
}
else if (Int(String(APTeams.text)) > 9999)
{
let alertController: UIAlertController = UIAlertController(
title: "Math Error!",
message: "Please input a number of teams less than 10,000.",
preferredStyle: UIAlertControllerStyle.Alert)
let okAction = UIAlertAction(
title: "OK",
style: UIAlertActionStyle.Default,
handler: nil)
alertController.addAction(okAction)
presentViewController(alertController, animated: true, completion: nil)
}
else
{
// everything is fine, so manually go to your next ViewController
self.performSegueWithIdentifier("3on3Segue", sender: nil)
}
}
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
let DestViewController : View3on3Results = segue.destinationViewController as! View3on3Results
DestViewController.AP1 = APTeams.text!
DestViewController.AP2 = APRounds.text!
DestViewController.AP3 = APBreakers.text!
}
推荐答案
我会更改您的代码a一点。
I would change your code a little bit.
将ViewController1连接到ViewController2(而不是Button),因此您可以手动执行segue。我不会进入 prepareForSegue-我会编写自己的是否通过检查功能,就像这样:
Connect your ViewController1 to your ViewController2 (not the Button), so you are able to manually perform a segue. I would not go into "prepareForSegue" - i would write my own "check if passed" function, like that:
func checkIfPassed() {
if (APTeams.text!.isEmpty || APRounds.text!.isEmpty || APBreakers.text!.isEmpty)
{
// show your first alert
} else if(APTeams.text.toInt() != nil && ABreakers.text.toInt() != nil)) {
// ok, both values are no integers, show your next error
// show your second alert
} else if(APTeams.text.toInt() < ABreakers.text.toInt()) {
// values are integers, and ABreakers.text is > then APTeams.text
// show your third alert, and so on
} else {
// everything is fine, so manually go to your next ViewController
self.performSegueWithIdentifier("yourSegueIdentifier", nil)
}
}
更新:现在可以检查字符串是否为整数,并具有可选选项:(Swift 2.0)
Update: You can now check your Strings if they are integers with Optionals: (Swift 2.0)
let text:Int? = Int(textfield.text)
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