app crashing when trying to set a NSUserDefault with button - ios

Question

I'm creating an app and trying to update a NSUserDefault from a a different view controller, although i don't think its the separate view controller thats doing it because i can't set a new NSUserDefault on this controller either. its crashing whenever i push the button, heres the code from the view controller:
// Upgrades.swift
// Unit3Final
//
// Created by fgstu on 4/14/16.
// Copyright © 2016 AllenH. All rights reserved.
//
import UIKit
class Upgrades: UIViewController {
var tapModifier = (NSUserDefaults.standardUserDefaults().integerForKey("tapModifier"))
func storeTheScore() {
NSUserDefaults.standardUserDefaults().setInteger(tapModifier, forKey: "tapModifier")
}
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 BuyAHut(sender: UIButton) {
tapModifier += 5
storeTheScore()
}
}
it is set in my main view controller in my viewDidLoad with
var tapModifier: Int = 1
NSUserDefaults.standardUserDefaults().setInteger(tapModifier, forKey: "tapModifier")
and the error message is
2016-04-14 12:13:45.264 Unit3Final[40985:5120078] -[Unit3Final.Upgrades hutUpgrade:]: unrecognized selector sent to instance 0x7fadab4b2e80
2016-04-14 12:13:45.270 Unit3Final[40985:5120078] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[Unit3Final.Upgrades hutUpgrade:]: unrecognized selector sent to instance 0x7fadab4b2e80'
*** First throw call stack:
(
0 CoreFoundation 0x000000010258de65 __exceptionPreprocess + 165
1 libobjc.A.dylib 0x00000001042cddeb objc_exception_throw + 48
2 CoreFoundation 0x000000010259648d -[NSObject(NSObject) doesNotRecognizeSelector:] + 205
3 CoreFoundation 0x00000001024e390a ___forwarding___ + 970
4 CoreFoundation 0x00000001024e34b8 _CF_forwarding_prep_0 + 120
5 UIKit 0x0000000102dac194 -[UIApplication sendAction:to:from:forEvent:] + 92
6 UIKit 0x0000000102f1b6fc -[UIControl sendAction:to:forEvent:] + 67
7 UIKit 0x0000000102f1b9c8 -[UIControl _sendActionsForEvents:withEvent:] + 311
8 UIKit 0x0000000102f1aaf8 -[UIControl touchesEnded:withEvent:] + 601
9 UIKit 0x0000000102e1b49b -[UIWindow _sendTouchesForEvent:] + 835
10 UIKit 0x0000000102e1c1d0 -[UIWindow sendEvent:] + 865
11 UIKit 0x0000000102dcab66 -[UIApplication sendEvent:] + 263
12 UIKit 0x0000000102da4d97 _UIApplicationHandleEventQueue + 6844
13 CoreFoundation 0x00000001024b9a31 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 17
14 CoreFoundation 0x00000001024af95c __CFRunLoopDoSources0 + 556
15 CoreFoundation 0x00000001024aee13 __CFRunLoopRun + 867
16 CoreFoundation 0x00000001024ae828 CFRunLoopRunSpecific + 488
17 GraphicsServices 0x0000000106bcdad2 GSEventRunModal + 161
18 UIKit 0x0000000102daa610 UIApplicationMain + 171
19 Unit3Final 0x000000010201db7d main + 109
20 libdyld.dylib 0x0000000104ddf92d start + 1
21 ??? 0x0000000000000001 0x0 + 1
)
libc++abi.dylib: terminating with uncaught exception of type NSException
(lldb)

Answer 1

It doesn't have a value, that's why it's crashing, try setting it to 0 initially.
You're adding 5 to nothing, instead of this,
tapModifier = NSUserDefaults etc...
try...
tapModifier = 0