问题
I am using xcode 7 beta and swift 2.0. I am following a tutorial (youtube.com/watch?v=PKOswUE731c).
In short i have a storyboard with 3 views; a protected vc, a login vc and RegisterViewController. I have set 2 segues
segue modal with protected_vc <-> login_vc identified with loginView
segue modal on a button in login_vc <-> RegisterViewController identified with registerView
I encountered a problem when with a register button on my login vc. If i click the register button it crashes the app and i get the message 'Receiver (<registerLogin.RegisterViewController: 0x7f97235f6140>) has no segue with identifier 'loginView''
Now i notice in the tutorial selecting a segue gives another dropdown, in my case i only see push - modal -popover - replace and custom. Could this be the cause??
Or this part ViewController
override func viewDidAppear(animated: Bool) {
self.performSegueWithIdentifier("loginView", sender: self);
}
Complete code for RegisterViewController is
import UIKit
class RegisterViewController: ViewController {
@IBOutlet weak var userEmailTextField: UITextField!
@IBOutlet weak var userPasswordTextField: UITextField!
@IBOutlet weak var repeatPasswordTextField: UITextField!
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
@IBAction func registerButtonTapped(sender: AnyObject) {
let userEmail = userEmailTextField.text
let userPassword = userPasswordTextField.text
let repeatPassword = repeatPasswordTextField.text
//No empty fields
if((userEmail!.isEmpty || userPassword!.isEmpty || repeatPassword!.isEmpty)){
//Display alert message
displayMyAlertMessage("All fields required")
return
}
//Check if passwords match
if(userPassword != repeatPassword){
//Display alert message
displayMyAlertMessage("Passwords mistakes")
return
}
//Store data
NSUserDefaults.standardUserDefaults().setObject(userEmail, forKey: "userEmail")
NSUserDefaults.standardUserDefaults().setObject(userPassword, forKey: "userPassword")
NSUserDefaults.standardUserDefaults().synchronize()
//Display alert message with confirmation
let myAlert = UIAlertController(title: "Alert", message: "Registration successful", preferredStyle: UIAlertControllerStyle.Alert)
let okAction = UIAlertAction(title: "Ok", style: UIAlertActionStyle.Default) { action in
self.dismissViewControllerAnimated(true, completion: nil)
}
}
func displayMyAlertMessage(userMessage:String){
let myAlert = UIAlertController(title: "Alert", message: userMessage, preferredStyle: UIAlertControllerStyle.Alert)
let okAction = UIAlertAction(title: "Ok", style: UIAlertActionStyle.Default, handler: nil)
myAlert.addAction(okAction)
self.presentViewController(myAlert, animated: true, completion: nil)
}
}
and the complete error message (manually wrapped first line):
2015-10-11 07:17:57.378 registerLogin[667:10462] *** Terminating app due to uncaught exception 'NSInvalidArgumentException',
reason: 'Receiver (<registerLogin.RegisterViewController: 0x7fb7f978d4c0>)
has no segue with identifier 'loginView''
*** First throw call stack:
(
0 CoreFoundation 0x0000000102d249b5 __exceptionPreprocess + 165
1 libobjc.A.dylib 0x0000000104923deb objc_exception_throw + 48
2 UIKit 0x00000001036caba3 -[UIViewController shouldPerformSegueWithIdentifier:sender:] + 0
3 registerLogin 0x0000000102b4260f _TFC13registerLogin14ViewController13viewDidAppearfS0_FSbT_ + 127
4 registerLogin 0x0000000102b42661 _TToFC13registerLogin14ViewController13viewDidAppearfS0_FSbT_ + 49
5 UIKit 0x00000001036cd82e -[UIViewController _setViewAppearState:isAnimating:] + 830
6 UIKit 0x00000001036ce1b0 -[UIViewController _endAppearanceTransition:] + 262
7 UIKit 0x000000010369950e -[UIPresentationController transitionDidFinish:] + 827
8 UIKit 0x0000000103857c17 -[_UICurrentContextPresentationController transitionDidFinish:] + 42
9 UIKit 0x000000010369c97e __56-[UIPresentationController runTransitionForCurrentState]_block_invoke_2 + 183
10 UIKit 0x0000000103eb105c -[_UIViewControllerTransitionContext completeTransition:] + 101
11 UIKit 0x00000001036963fb -[UITransitionView notifyDidCompleteTransition:] + 252
12 UIKit 0x000000010369610c -[UITransitionView _didCompleteTransition:] + 1344
13 UIKit 0x0000000103698878 -[UITransitionView _transitionDidStop:finished:] + 104
14 UIKit 0x00000001035c3a63 -[UIViewAnimationState sendDelegateAnimationDidStop:finished:] + 241
15 UIKit 0x00000001035c3e12 -[UIViewAnimationState animationDidStop:finished:] + 80
16 QuartzCore 0x000000010799bd70 _ZN2CA5Layer23run_animation_callbacksEPv + 308
17 libdispatch.dylib 0x000000010540d4bb _dispatch_client_callout + 8
18 libdispatch.dylib 0x00000001053f53ff _dispatch_main_queue_callback_4CF + 1738
19 CoreFoundation 0x0000000102c84e69 __CFRUNLOOP_IS_SERVICING_THE_MAIN_DISPATCH_QUEUE__ + 9
20 CoreFoundation 0x0000000102c463b9 __CFRunLoopRun + 2073
21 CoreFoundation 0x0000000102c45918 CFRunLoopRunSpecific + 488
22 GraphicsServices 0x000000010722dad2 GSEventRunModal + 161
23 UIKit 0x000000010354199e UIApplicationMain + 171
24 registerLogin 0x0000000102b4323d main + 109
25 libdyld.dylib 0x000000010544292d start + 1
)
libc++abi.dylib: terminating with uncaught exception of type NSException
I have set the segues
and from the register button
A find in project on the term loginView only gives 2 search results see image, so i don't get where RegisterViewController "thinks" it needs loginView
回答1:
Your class RegisterViewController is a subclass of ViewController, but likely should be a subclass of UIViewController. Probably your ViewController class is the main view controller already created when creating a new project.
When RegisterViewController is a subclass of ViewController, it also inherits the viewDidAppear method. Therefore when it appears it calls performSegue... with loginView, but now with the instance of RegisterViewController there is no loginView segue. Hence the exception.
Original answer below, which is the likely reason for an exception of the kind has no segue with identifier '...name...':
Likely your segue identifier is not set or misspelled.
- Click on the segue
- Make sure the Utilities panel on the right hand side is visible
- Make sure the Attributes inspector is visible
- Check the value for "Identifier" under "Storyboard Segue" (in the screenshot it is "infoSegue")
来源：https://stackoverflow.com/questions/33057818/receiver-has-no-segue-with-identifier-error-message