Crash on Float to Int conversion - ios

Question

I'm getting a random crash on my live app on Float to Int conversion line.
I can't figure out why it's crashing and can't reproduce it as it's random crash on live app. Any suggestion on how to fix crash?
Crash log
Crashed: com.apple.main-thread
0 MyApp 0x100703778 closure #1 in MyViewController.getBalance(isRefreshed:) + 797 (MyViewController.swift:797)
1 MyApp 0x1005c7670 closure #1 in closure #1 in fetchtBalance(completed:) + 185 (Utils.swift:185)
2 MyApp 0x10051ab10 thunk for #escaping #callee_guaranteed () -> () + 4335790864 (<compiler-generated>:4335790864)
3 libdispatch.dylib 0x1ae908b7c _dispatch_call_block_and_release + 32
4 libdispatch.dylib 0x1ae909fd8 _dispatch_client_callout + 20
5 libdispatch.dylib 0x1ae915cc8 _dispatch_main_queue_callback_4CF + 968
6 CoreFoundation 0x1aebdee0c __CFRUNLOOP_IS_SERVICING_THE_MAIN_DISPATCH_QUEUE__ + 16
7 CoreFoundation 0x1aebd9b68 __CFRunLoopRun + 1980
8 CoreFoundation 0x1aebd9084 CFRunLoopRunSpecific + 480
9 GraphicsServices 0x1b8e27534 GSEventRunModal + 108
10 UIKitCore 0x1b2d49670 UIApplicationMain + 1940
11 MyApp 0x1004ec6b8 main + 20 (ClientMyProfileViewController.swift:20)
12 libdyld.dylib 0x1aea58e18 start + 4
Code
import UIKit
var balance: String!
var cost: String?
func getBalance () {
fetchBalance() { (result, error) in
guard let balanceFloatValue = Float(balance!) else {
print("Error")
return
}
guard let costFloat = Float(cost!) else {
print("Error")
return
}
let costPerSec = costFloat / 60
let talkTime = balanceFloatValue / costPerSec
let talkTimeInt = Int(talkTime) // Line No. 797 Crash here
// ....
}
}

Answer 1

The most likely cause for this error is the values themselves
let a:Float = 9999999999999999999999.9
let b = "0.000000000000000000001"
let c:Float = a/Float(b)!
let x = Int(c) // <- Crash here
0/0 will make you crash in: let c:Float = a/Float(b)! so thats not it, but anything else that can make talkTime outside of a Int will make you crash
This would also explain why you only encounter the error randomly since its only for values that make that division NaN or inf or something outside the int like bg2b said

Answer 2

I think you are force unwrapping the balance value. Try to unwrap the converted value like: „Float(balance)!“