Detect App Crash on Launch

问题

I saw a couple applications that detect whether an app crashed the last time it was used to encourage the user to report the bug.

How can I do that? I tried this solution, but didn't get it to work in my swift project...
An approach I thought of is to save something each time the app is about to be closed and then read the value when launching the app, I guess when the app crashes then it won't be able to save anything anymore, right?
But, this is not very elegant. Is there a better way for detecting a crash?

Thanks in advance :)

回答1:

You could use an inline closure to perform you logging during crash.

NSSetUncaughtExceptionHandler { exception in
    // Do necessary logging work here
}

This SO thread might be of help to you..

回答2:

You could use crashlytics by twitter.

Download fabric mac app
Open it & sign up for a new account
Add your xcode project to your list of projects in the fabric
Select to add the crashlytics framework to your app
Build your app
See the given code snippet to start with crashlytics
Visit Fabric documentation for further information

回答3:

import XCPlayground
import Foundation


let fm = NSFileManager()
if fm.fileExistsAtPath("terminated") {
    try! fm.removeItemAtPath("terminated")
} else {
    print("an app crashed last time")
}
// set i to nil to force the app to crash
// than set it to 0 and execute it again
let i: Int! = 0
let j: Int = i

fm.createFileAtPath("terminated", contents: nil, attributes: nil)
print("terminated")

来源：https://stackoverflow.com/questions/33844313/detect-app-crash-on-launch