This question already has answers here:
this class is not key value coding-compliant for the key view [duplicate]
(7 answers)
Closed 8 years ago.
I am learning iOS by following a online video class. I am unsure of why I am getting this error. I feel as thought I followed everything step by step and I ended up with this error:
Usually I would look at the error and traceback to try to find where the error occurred but I am new to iOS and I do not understand the output one bit.
2015-01-30 17:57:40.511 99RedBalloons[18322:1563170] *** Terminating app due to uncaught exception 'NSUnknownKeyException', reason: '[<_9RedBalloons.ViewController 0x7fb5d3e17750> setValue:forUndefinedKey:]: this class is not key value coding-compliant for the key backgroundimageView.'
*** First throw call stack:
(
0 CoreFoundation 0x000000010ca3ff35 __exceptionPreprocess + 165
1 libobjc.A.dylib 0x000000010e583bb7 objc_exception_throw + 45
2 CoreFoundation 0x000000010ca3fb79 -[NSException raise] + 9
3 Foundation 0x000000010ce577b3 -[NSObject(NSKeyValueCoding) setValue:forKey:] + 259
4 CoreFoundation 0x000000010c989e80 -[NSArray makeObjectsPerformSelector:] + 224
5 UIKit 0x000000010d590c7d -[UINib instantiateWithOwner:options:] + 1506
6 UIKit 0x000000010d3eff98 -[UIViewController _loadViewFromNibNamed:bundle:] + 242
7 UIKit 0x000000010d3f0588 -[UIViewController loadView] + 109
8 UIKit 0x000000010d3f07f9 -[UIViewController loadViewIfRequired] + 75
9 UIKit 0x000000010d3f0c8e -[UIViewController view] + 27
10 UIKit 0x000000010d30fca9 -[UIWindow addRootViewControllerViewIfPossible] + 58
11 UIKit 0x000000010d310041 -[UIWindow _setHidden:forced:] + 247
12 UIKit 0x000000010d31c72c -[UIWindow makeKeyAndVisible] + 42
13 UIKit 0x000000010d2c7061 -[UIApplication _callInitializationDelegatesForMainScene:transitionContext:] + 2628
14 UIKit 0x000000010d2c9d2c -[UIApplication _runWithMainScene:transitionContext:completion:] + 1350
15 UIKit 0x000000010d2c8bf2 -[UIApplication workspaceDidEndTransaction:] + 179
16 FrontBoardServices 0x00000001101102a3 __31-[FBSSerialQueue performAsync:]_block_invoke + 16
17 CoreFoundation 0x000000010c97553c __CFRUNLOOP_IS_CALLING_OUT_TO_A_BLOCK__ + 12
18 CoreFoundation 0x000000010c96b285 __CFRunLoopDoBlocks + 341
19 CoreFoundation 0x000000010c96aa43 __CFRunLoopRun + 851
20 CoreFoundation 0x000000010c96a486 CFRunLoopRunSpecific + 470
21 UIKit 0x000000010d2c8669 -[UIApplication _run] + 413
22 UIKit 0x000000010d2cb420 UIApplicationMain + 1282
23 99RedBalloons 0x000000010c4aacce top_level_code + 78
24 99RedBalloons 0x000000010c4aad0a main + 42
25 libdyld.dylib 0x000000010ed5d145 start + 1
26 ??? 0x0000000000000001 0x0 + 1
)
libc++abi.dylib: terminating with uncaught exception of type NSException
(lldb)
I don't understand the Traceback one bit
code:
import UIKit
class ViewController: UIViewController {
#IBOutlet weak var balloonsLabel: UILabel!
#IBOutlet weak var backgroundImageView: UIImageView!
var balloons:[Balloon] = [];
var currentIndex = 0;
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
self.createBalloons()
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
#IBAction func nextBalloonBarButtonItemPressed(sender: UIBarButtonItem) {
let balloon = balloons[currentIndex]
balloonsLabel.text = "\(balloon.number) balloon"
backgroundImageView.image = balloon.image
currentIndex += 1
}
func createBalloons() {
for var balloonCount = 0; balloonCount <= 99; ++balloonCount {
var balloon = Balloon();
balloon.number = balloonCount;
let randomNumber = Int(arc4random_uniform(UInt32(4)));
switch randomNumber {
case 1:
balloon.image = UIImage(named: "RedBalloon1.jpg")
case 2:
balloon.image = UIImage(named: "RedBalloon2.jpg")
case 3:
balloon.image = UIImage(named: "RedBalloon3.jpg")
default:
balloon.image = UIImage(named: "RedBalloon4.jpg")
}
self.balloons.append(balloon);
}
}
}
Balloon.swft:
import Foundation
import UIKit
struct Balloon {
var number = 0;
var image = UIImage(named: "");
}
The error is saying that it doesn't know the property, backgroundimageView -- notice the lowercase "i". Your property name is backgroundImageView with a capital "I". Somewhere in the storyboard or xib, you're using this property with incorrect spelling.
Related
My app was working perfectly until I added an #IBAction. Now I just get this error:
2017-06-09 07:55:35.285 Press[1594:102051] * Terminating app due to uncaught exception 'NSUnknownKeyException', reason: '[ setValue:forUndefinedKey:]: this class is not key value coding-compliant for the key add.'
* First throw call stack:
(
0 CoreFoundation 0x000000010724bb0b exceptionPreprocess + 171
1 libobjc.A.dylib 0x00000001044f3141 objc_exception_throw + 48
2 CoreFoundation 0x000000010724ba59 -[NSException raise] + 9
3 Foundation 0x0000000104008e8b -[NSObject(NSKeyValueCoding) setValue:forKey:] + 292
4 UIKit 0x0000000104b60644 -[UIViewController setValue:forKey:] + 87
5 UIKit 0x0000000104dcd6b9 -[UIRuntimeOutletConnection connect] + 109
6 CoreFoundation 0x00000001071f1e8d -[NSArray makeObjectsPerformSelector:] + 269
7 UIKit 0x0000000104dcc06f -[UINib instantiateWithOwner:options:] + 1856
8 UIKit 0x0000000104b66c73 -[UIViewController _loadViewFromNibNamed:bundle:] + 381
9 UIKit 0x0000000104b67589 -[UIViewController loadView] + 177
10 UIKit 0x0000000104b678ba -[UIViewController loadViewIfRequired] + 195
11 UIKit 0x0000000104b6810a -[UIViewController view] + 27
12 UIKit 0x0000000104a3063a -[UIWindow addRootViewControllerViewIfPossible] + 65
13 UIKit 0x0000000104a30d20 -[UIWindow _setHidden:forced:] + 294
14 UIKit 0x0000000104a43b6e -[UIWindow makeKeyAndVisible] + 42
15 UIKit 0x00000001049bd31f -[UIApplication _callInitializationDelegatesForMainScene:transitionContext:] + 4346
16 UIKit 0x00000001049c3584 -[UIApplication _runWithMainScene:transitionContext:completion:] + 1709
17 UIKit 0x00000001049c0793 -[UIApplication workspaceDidEndTransaction:] + 182
18 FrontBoardServices 0x000000010895b5f6 __FBSSERIALQUEUE_IS_CALLING_OUT_TO_A_BLOCK + 24
19 FrontBoardServices 0x000000010895b46d -[FBSSerialQueue _performNext] + 186
20 FrontBoardServices 0x000000010895b7f6 -[FBSSerialQueue _performNextFromRunLoopSource] + 45
21 CoreFoundation 0x00000001071f1c01 CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION + 17
22 CoreFoundation 0x00000001071d70cf __CFRunLoopDoSources0 + 527
23 CoreFoundation 0x00000001071d65ff __CFRunLoopRun + 911
24 CoreFoundation 0x00000001071d6016 CFRunLoopRunSpecific + 406
25 UIKit 0x00000001049bf02f -[UIApplication _run] + 468
26 UIKit 0x00000001049c50d4 UIApplicationMain + 159
27 Press 0x0000000103f1a877 main + 55
28 libdyld.dylib 0x00000001081eb65d start + 1
29 ??? 0x0000000000000001 0x0 + 1
)
libc++abi.dylib: terminating with uncaught exception of type NSException
This is my Viewcontroller code:
import UIKit
class ViewController: UIViewController {
// OUTLETS
#IBOutlet weak var score: UILabel!
#IBAction func add(_ sender: Any) {
add()
}
// VARIABLES
var scoreVar = 0
let levelUpAt = [50, 100, 500, 1000, 5000, 10000, 50000, 100000]
var currentLevel = 1
var toAdd = 1
// OVERRIDES
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
}
// FUNCTIONS
// Below code adds to the score
func add() {
scoreVar += 1 // Adds 1 to scoreVar
score.text = "scoreVar"; // Updates text to match
checkForLevelUp(); // Calls the function defined in the next few days ago
}
// Below code checks if the score meets the next level requirements
func checkForLevelUp() {
if (scoreVar - 1 < levelUpAt[currentLevel - 1]) { // Complicated math-y if statment
currentLevel += 1
toAdd += 1
}
}
}
It seems to be stuck on the class AppDelegate: UIResponder, UIApplicationDelegate { line on the AppDelegate, according to the debugger.
Go to your story board and click on the ViewController. Click one the Add button you created.
On the right side in the Outlet Inspector, remove anything mentioning the "Add" button.
Finally, recreate the outlets by option dragging from the button to your view controller and setting the type to "Action".
Why do I get a Thread:1 Signal SIGAGBRT within this code? I don't know what to change to fix the error. The application starts and as soon as I press the button the app cancels out and gives me an error.
import UIKit
class ViewController: UIViewController {
#IBOutlet var textFieldInput: UITextField!
#IBOutlet var laCelsius: UILabel!
#IBOutlet var laFahrenheit: UILabel!
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
#IBAction func btn(sender: UIButton) {
var c_out = 0.0
var f_out = 0.0
var inputValue = 0.0
let textInput = NSString(string: textFieldInput.text!)
inputValue = textInput.doubleValue
c_out = (inputValue-32)*5/9
f_out = inputValue * 1.8 + 32
self.laCelsius.text = NSString(format: "%3.2f" ,c_out) as String
self.laFahrenheit.text = NSString(format: "%3.2f" ,f_out) as String
}
}
this is the error code:
2016-09-22 14:15:51.669 DegreeCL[19045:1774964] -[DegreeCL.ViewController btnPressed:]: unrecognized selector sent to instance 0x7fa7bb643d40
2016-09-22 14:15:51.674 DegreeCL[19045:1774964] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[DegreeCL.ViewController btnPressed:]: unrecognized selector sent to instance 0x7fa7bb643d40'
*** First throw call stack:
(
0 CoreFoundation 0x000000010de1dd85 __exceptionPreprocess + 165
1 libobjc.A.dylib 0x000000010fbc1deb objc_exception_throw + 48
2 CoreFoundation 0x000000010de26d3d -[NSObject(NSObject) doesNotRecognizeSelector:] + 205
3 CoreFoundation 0x000000010dd6ccfa ___forwarding___ + 970
4 CoreFoundation 0x000000010dd6c8a8 _CF_forwarding_prep_0 + 120
5 UIKit 0x000000010e647a8d -[UIApplication sendAction:to:from:forEvent:] + 92
6 UIKit 0x000000010e7bae67 -[UIControl sendAction:to:forEvent:] + 67
7 UIKit 0x000000010e7bb143 -[UIControl _sendActionsForEvents:withEvent:] + 327
8 UIKit 0x000000010e7ba263 -[UIControl touchesEnded:withEvent:] + 601
9 UIKit 0x000000010e6ba99f -[UIWindow _sendTouchesForEvent:] + 835
10 UIKit 0x000000010e6bb6d4 -[UIWindow sendEvent:] + 865
11 UIKit 0x000000010e666dc6 -[UIApplication sendEvent:] + 263
12 UIKit 0x000000010e640553 _UIApplicationHandleEventQueue + 6660
13 CoreFoundation 0x000000010dd43301 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 17
14 CoreFoundation 0x000000010dd3922c __CFRunLoopDoSources0 + 556
15 CoreFoundation 0x000000010dd386e3 __CFRunLoopRun + 867
16 CoreFoundation 0x000000010dd380f8 CFRunLoopRunSpecific + 488
17 GraphicsServices 0x00000001124b3ad2 GSEventRunModal + 161
18 UIKit 0x000000010e645f09 UIApplicationMain + 171
19 DegreeCL 0x000000010dc38412 main + 114
20 libdyld.dylib 0x000000011068592d start + 1
21 ??? 0x0000000000000001 0x0 + 1
)
libc++abi.dylib: terminating with uncaught exception of type NSException
(lldb)
The crucial information is
[DegreeCL.ViewController btnPressed:]: unrecognized selector sent to instance ...'
That means in Interface Builder there is somewhere a dead connection to an action btnPressed. Remove it.
You can search for btnPressed with ⇧⌘F.
SIGABRIT - signal is sent due to many reasons but in this case i think you have problem with Memory.
You should turn on All Exeptions with option of po $arg1 it will identify the error.
Select your button from interface builder, then select connection inspector from utilities and check that if you have extra connected action method should be there, remove it by clicking x and your issue will be solved!
It's should be btnPressed as per your crash log!
I am trying to make a stopwatch app for a coding class I am taking. I have no errors before I run the code, but once I run it it crashes after "build succeeds".
import UIKit
class ViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
}
var timer = NSTimer()
var count = 0
func updateTime() {
count++
timeLabel.text = "\(count)"
}
#IBOutlet weak var timeLabel: UILabel!
#IBAction func playButton(sender: AnyObject) {
timer = NSTimer.scheduledTimerWithTimeInterval(1, target: self, selector: Selector("updateTime"), userInfo: nil, repeats: true)
}
#IBAction func pauseButton(sender: AnyObject) {
}
#IBAction func resetButton(sender: AnyObject) {
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
}
Here is the output console:
2015-07-23 12:52:26.877 Stop Watch[7472:467329] *** Terminating app
due to uncaught exception 'NSUnknownKeyException', reason:
'[<Stop_Watch.ViewController 0x7ffdf1435b60> setValue:forUndefinedKey:]:
this class is not key value coding-compliant for the key play.'
*** First throw call stack:
(
0 CoreFoundation 0x000000010a814c65 __exceptionPreprocess + 165
1 libobjc.A.dylib 0x000000010c37fbb7 objc_exception_throw + 45
2 CoreFoundation 0x000000010a8148a9 -[NSException raise] + 9
3 Foundation 0x000000010ac32b53 -[NSObject(NSKeyValueCoding) setValue:forKey:] + 259
4 CoreFoundation 0x000000010a75cd50 -[NSArray makeObjectsPerformSelector:] + 224
5 UIKit 0x000000010b38b4eb -[UINib instantiateWithOwner:options:] + 1506
6 UIKit 0x000000010b1e36d8 -[UIViewController _loadViewFromNibNamed:bundle:] + 242
7 UIKit 0x000000010b1e3cc8 -[UIViewController loadView] + 109
8 UIKit 0x000000010b1e3f39 -[UIViewController loadViewIfRequired] + 75
9 UIKit 0x000000010b1e43ce -[UIViewController view] + 27
10 UIKit 0x000000010b0ff289 -[UIWindow addRootViewControllerViewIfPossible] + 58
11 UIKit 0x000000010b0ff64f -[UIWindow _setHidden:forced:] + 247
12 UIKit 0x000000010b10bde1 -[UIWindow makeKeyAndVisible] + 42
13 UIKit 0x000000010b0af417 -[UIApplication _callInitializationDelegatesForMainScene:transitionContext:] + 2732
14 UIKit 0x000000010b0b219e -[UIApplication _runWithMainScene:transitionContext:completion:] + 1349
15 UIKit 0x000000010b0b1095 -[UIApplication workspaceDidEndTransaction:] + 179
16 FrontBoardServices 0x000000010de7c5e5 __31-[FBSSerialQueue performAsync:]_block_invoke_2 + 21
17 CoreFoundation 0x000000010a74841c __CFRUNLOOP_IS_CALLING_OUT_TO_A_BLOCK__ + 12
18 CoreFoundation 0x000000010a73e165 __CFRunLoopDoBlocks + 341
19 CoreFoundation 0x000000010a73df25 __CFRunLoopRun + 2389
20 CoreFoundation 0x000000010a73d366 CFRunLoopRunSpecific + 470
21 UIKit 0x000000010b0b0b02 -[UIApplication _run] + 413
22 UIKit 0x000000010b0b38c0 UIApplicationMain + 1282
23 Stop Watch 0x000000010a618fa7 main + 135
24 libdyld.dylib 0x000000010cab5145 start + 1
25 ??? 0x0000000000000001 0x0 + 1
)
libc++abi.dylib: terminating with uncaught exception of type NSException
(lldb)
After looking at the console log, I am pretty sure the crash occurs because of a missing outlet connection.
Press Cmd+Shift+F and type 'play' in the search field.
Look for a entry in your storyboard file, of the form ...: Outlet = "play".
Click on that entry and remove it by clicking on the 'x' button next to play.
This should fix the crash.
Whenever you see an error of the form:
... this class is not key value coding-compliant for the key ...
you should check if there is a missing outlet in your storyboard or xib.
SO I'm making a simple stopwatch app via a tutorial I found online. I followed the code word for ford and created a the UI to connect to it too.
However, whenever I try to run the program it the iOS Simulator fails to get past the screen which states the name of the app. Then it produces a ton of code, and highlights this:
class AppDelegate: UIResponder, UIApplicationDelegate {`
under which it states THREAD 1: signal SIGABRT
What does that mean?
Also in the console I get this message:
(apologies in advance for the big chunk of code, tabbing it it didn't seem to work)
2015-06-15 15:53:54.313 stopwatch2[20524:1296474] *** Terminating app due to uncaught exception 'NSUnknownKeyException', reason: '[<stopwatch2.ViewController 0x7f9280476960> setValue:forUndefinedKey:]: this class is not key value coding-compliant for the key display.'
*** First throw call stack:
(
0 CoreFoundation 0x000000010fcecc65 __exceptionPreprocess + 165
1 libobjc.A.dylib 0x0000000111857bb7 objc_exception_throw + 45
2 CoreFoundation 0x000000010fcec8a9 -[NSException raise] + 9
3 Foundation 0x000000011010ab53 -[NSObject(NSKeyValueCoding) setValue:forKey:] + 259
4 CoreFoundation 0x000000010fc34d50 -[NSArray makeObjectsPerformSelector:] + 224
5 UIKit 0x000000011086352b -[UINib instantiateWithOwner:options:] + 1506
6 UIKit 0x00000001106bb718 -[UIViewController _loadViewFromNibNamed:bundle:] + 242
7 UIKit 0x00000001106bbd08 -[UIViewController loadView] + 109
8 UIKit 0x00000001106bbf79 -[UIViewController loadViewIfRequired] + 75
9 UIKit 0x00000001106bc40e -[UIViewController view] + 27
10 UIKit 0x00000001105d72c9 -[UIWindow addRootViewControllerViewIfPossible] + 58
11 UIKit 0x00000001105d768f -[UIWindow _setHidden:forced:] + 247
12 UIKit 0x00000001105e3e21 -[UIWindow makeKeyAndVisible] + 42
13 UIKit 0x0000000110587457 -[UIApplication _callInitializationDelegatesForMainScene:transitionContext:] + 2732
14 UIKit 0x000000011058a1de -[UIApplication _runWithMainScene:transitionContext:completion:] + 1349
15 UIKit 0x00000001105890d5 -[UIApplication workspaceDidEndTransaction:] + 179
16 FrontBoardServices 0x00000001133675e5 __31-[FBSSerialQueue performAsync:]_block_invoke_2 + 21
17 CoreFoundation 0x000000010fc2041c __CFRUNLOOP_IS_CALLING_OUT_TO_A_BLOCK__ + 12
18 CoreFoundation 0x000000010fc16165 __CFRunLoopDoBlocks + 341
19 CoreFoundation 0x000000010fc15f25 __CFRunLoopRun + 2389
20 CoreFoundation 0x000000010fc15366 CFRunLoopRunSpecific + 470
21 UIKit 0x0000000110588b42 -[UIApplication _run] + 413
22 UIKit 0x000000011058b900 UIApplicationMain + 1282
23 stopwatch2 0x000000010faf0ff7 main + 135
24 libdyld.dylib 0x0000000111faf145 start + 1
)
libc++abi.dylib: terminating with uncaught exception of type NSException
(lldb)
However, this is my actual code:
import UIKit
class ViewController: UIViewController {
var timer = NSTimer()
var count = 0
func updateTime() {
count++
time.text = "\(count)"
}
#IBOutlet var time: UILabel!
#IBAction func pause(sender: AnyObject) {
timer.invalidate()
}
#IBAction func stop(sender: AnyObject) {
timer.invalidate()
count = 0
time.text = "0"
}
#IBAction func start(sender: AnyObject) {
timer = NSTimer.scheduledTimerWithTimeInterval(1, target: self, selector: Selector("updateTime"),userInfo: nil, repeats: true)
}
override func viewDidLoad() {
super.viewDidLoad()
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
}
}
Someone please help?
You probably connected an object called display to your View Controller, but then removed/changed the property in the source code.
You have to go to your controller in the Storyboard, click the outlets icon and delete the display outlet, it will have an exclamation mark.
This question already has answers here:
setValue:forUndefinedKey: this class is not key value coding-compliant for the key [duplicate]
(20 answers)
Closed 7 years ago.
I am very new to swift, extremely new, and I will probably feel like an idiot for asking this question. My very simple goal is that when my button is tapped the button's title will disappear, but unfortunately the app is crashing every time I run it and I don't know what I'm doing wrong. Thank you for the help.
import UIKit
class ViewController: UIViewController {
#IBOutlet weak var background1: UIImageView!
#IBOutlet weak var screenButton: UIButton!
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
self.screenButton.setTitle("Tap!", forState: UIControlState.Normal)
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
#IBAction func screenTapped(sender: AnyObject) {
self.screenButton.setTitle("", forState: UIControlState.Normal)
}
}
2015-04-10 17:13:41.465 TopScore[6391:414281] *** Terminating app due to uncaught exception 'NSUnknownKeyException', reason: '[ setValue:forUndefinedKey:]: this class is not key value coding-compliant for the key screenTapped.'
*** First throw call stack:
(
0 CoreFoundation 0x0000000104fc0a75 __exceptionPreprocess + 165
1 libobjc.A.dylib 0x0000000106b18bb7 objc_exception_throw + 45
2 CoreFoundation 0x0000000104fc06b9 -[NSException raise] + 9
3 Foundation 0x00000001053dbd43 -[NSObject(NSKeyValueCoding) setValue:forKey:] + 259
4 CoreFoundation 0x0000000104f0a5e0 -[NSArray makeObjectsPerformSelector:] + 224
5 UIKit 0x0000000105b1a4ed -[UINib instantiateWithOwner:options:] + 1506
6 UIKit 0x0000000105978a88 -[UIViewController _loadViewFromNibNamed:bundle:] + 242
7 UIKit 0x0000000105979078 -[UIViewController loadView] + 109
8 UIKit 0x00000001059792e9 -[UIViewController loadViewIfRequired] + 75
9 UIKit 0x000000010597977e -[UIViewController view] + 27
10 UIKit 0x0000000105898509 -[UIWindow addRootViewControllerViewIfPossible] + 58
11 UIKit 0x00000001058988a1 -[UIWindow _setHidden:forced:] + 247
12 UIKit 0x00000001058a4f8c -[UIWindow makeKeyAndVisible] + 42
13 UIKit 0x000000010584f0c2 -[UIApplication _callInitializationDelegatesForMainScene:transitionContext:] + 2732
14 UIKit 0x0000000105851e3e -[UIApplication _runWithMainScene:transitionContext:completion:] + 1349
15 UIKit 0x0000000105850d35 -[UIApplication workspaceDidEndTransaction:] + 179
16 FrontBoardServices 0x00000001086ca243 __31-[FBSSerialQueue performAsync:]_block_invoke + 16
17 CoreFoundation 0x0000000104ef5c7c __CFRUNLOOP_IS_CALLING_OUT_TO_A_BLOCK__ + 12
18 CoreFoundation 0x0000000104eeb9c5 __CFRunLoopDoBlocks + 341
19 CoreFoundation 0x0000000104eeb785 __CFRunLoopRun + 2389
20 CoreFoundation 0x0000000104eeabc6 CFRunLoopRunSpecific + 470
21 UIKit 0x00000001058507a2 -[UIApplication _run] + 413
22 UIKit 0x0000000105853580 UIApplicationMain + 1282
23 TopScore 0x0000000104de1cee top_level_code + 78
24 TopScore 0x0000000104de1d2a main + 42
25 libdyld.dylib 0x00000001072f4145 start + 1
26 ??? 0x0000000000000001 0x0 + 1
)
libc++abi.dylib: terminating with uncaught exception of type NSException
(lldb)
At some point, you accidentally set up an outlet called screenTapped. You need to find that outlet in Interface Builder in your storyboard and delete it.
What you want is an action from the button to screenTapped:. An action and an outlet are two very different things.