iOS app is only crashing on TestFlight build - ios

Question

I have an ios app in Swift.The app runs fine and does not crash when uploaded locally from xcode. But the app is crashing when uploaded from testflight.
I found that there is nothing wrong in code.
I have implemented Crashlytics in my app, it has given following report.
Crashed: com.apple.main-thread
EXC_BREAKPOINT 0x0000000100160fe4
Crashed: com.apple.main-thread
0 App 0x100160fe4 HomeViewController.viewDidLoad() -> () (HomeViewController.swift:57)
1 App 0x100161014 #objc HomeViewController.viewDidLoad() -> () (HomeViewController.swift)
2 UIKit 0x18c373ec0 -[UIViewController loadViewIfRequired] + 1036
3 UIKit 0x18c38b94c -[UIViewController __viewWillAppear:] + 132
4 UIKit 0x18c5101d4 -[UINavigationController _startCustomTransition:] + 1144
5 UIKit 0x18c42ab78 -[UINavigationController _startDeferredTransitionIfNeeded:] + 676
6 UIKit 0x18c42a7e0 -[UINavigationController __viewWillLayoutSubviews] + 64
7 UIKit 0x18c42a744 -[UILayoutContainerView layoutSubviews] + 188
8 UIKit 0x18c37107c -[UIView(CALayerDelegate) layoutSublayersOfLayer:] + 1200
9 QuartzCore 0x189561274 -[CALayer layoutSublayers] + 148
10 QuartzCore 0x189555de8 CA::Layer::layout_if_needed(CA::Transaction*) + 292
11 QuartzCore 0x189555ca8 CA::Layer::layout_and_display_if_needed(CA::Transaction*) + 32
12 QuartzCore 0x1894d134c CA::Context::commit_transaction(CA::Transaction*) + 252
13 QuartzCore 0x1894f83ac CA::Transaction::commit() + 504
14 QuartzCore 0x1894f8e78 CA::Transaction::observer_callback(__CFRunLoopObserver*, unsigned long, void*) + 120
15 CoreFoundation 0x1861f09a8 __CFRUNLOOP_IS_CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION__ + 32
16 CoreFoundation 0x1861ee630 __CFRunLoopDoObservers + 372
17 CoreFoundation 0x1861eea7c __CFRunLoopRun + 956
18 CoreFoundation 0x18611eda4 CFRunLoopRunSpecific + 424
19 GraphicsServices 0x187b88074 GSEventRunModal + 100
20 UIKit 0x18c3d9058 UIApplicationMain + 208
21 App 0x1000d8688 main (NewProductData.swift:18)
22 libdyld.dylib 0x18512d59c start + 4
I am not understanding anything from this reports, please help me out if anyone knows.
Here is viewDidload
override func viewDidLoad() {
super.viewDidLoad()
Giving instance of HomeViewController to AppDelegate
let appDele = UIApplication.shared.delegate as! AppDelegate
appDele.homeVC = self
token = FIRInstanceID.instanceID().token()!
//Method to handle Firebase token
UserDefaults.standard.set(token, forKey: "Notificationtoken")
print("####################### token provided is \(String(describing: token))")
let tokenstr = UserDefaults.standard.value(forKey: "Notificationtoken") as! String
if(token == tokenstr){
handleFCMToken(token: tokenstr)
}
else{
handleFCMToken(token: token!)
}
setUpNavBar()
setPopUpImage()
setUpcarousel()
setUpDelegates()
let help = Helper()
help.setUpGoogleAnalytics(screenName: "Home")
self.presenter = HomeViewPresenter(homeView: self)
presenter.getCarousel()
if(showProfile){
ProfileClicked()
}
// Do any additional setup after loading the view.
}
And here is viewWillAppear
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
setUpUI()
}
and method of setupUI
func setUpUI(){
let wholesaler:Wholesaler = Helper.getWsProfile()
DispatchQueue.main.async {
self.wholesalerName.text = "Hello, \(wholesaler.wholesaler_name)"
self.pdsPoints.text = "\(wholesaler.pdsPoints!)"
self.visibilityPoints.text = "\(wholesaler.visibilityPoins!)"
}
iconNameString = ["SMS","Customer\n Groups","Visibility\n Contest","My\n Earnings","\(wholesaler.lastSchemeMonth!)\n Schemes","App\n News", "", "Contact\n Us"]
}

Answer 1

I think that viewing some code of your HomeViewController will give us more insight.
But here some comments:
Not sure about the full stack, but its seems weird that viewWillAppear is being called before viewDidLoad for some reason. Are you calling super correctly on those corresponding methods?
Have you try profiling the app using instruments in release mode vs debug mode? You can manage this on your schema settings.
Another hint, but I think it kind of advanced for your scenario, is the optimization level. Go to your target settings and search for Optimization Level, you'll notice it is different for debug and release. Sometimes complex algorithms with multiple blocks and/or threads may be affected by this.
Home it helps