So here's the deal:
I am building an app that accesses the internal addressbook on the iPhone. Everything was working fine (and is working fine on the simulator still), but now on the device I get a ThreadBreak and lldb opens up with no error message in the console on this line:
tempPerson.firstname = ABRecordCopyValue(person, kABPersonFirstNameProperty)?.takeRetainedValue() as String? ?? ""
Again, this is still working on the simulator mind you and used to work just fine.
There is some multithread action going on because I am loading the addressbook into memory in the background using GCD above:
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_BACKGROUND, 0), {
My addressbook was loaded properly. I have deleted the app from my test device (iPhone 6), cleaned the project (figuring it could be a bad link between some Obj-C bridge file that didn't like the ABAddressBook datatype, and even hopped on one foot while holding the phone Northward for good luck. Nothing worked.
I just can't figure out why it would work on all the Simulators and not on the phone. I do, however, notice that the app is not asking permission to access the contacts when it firsts opens after deleting (though the Authorization check is called and is granting authorization):
case .Authorized:
return self.createAddressBook()
I'm at a loss at even what to show you all since it's not returning much of anything, but here is a breakdown of the Thread Error (NOTE: Sometimes it happens on different threads...)
Thread 4
Queue: com.apple.root.background.-qos (concurrent)
0 swift_getObjectType
1 swift_dynamicCast
2 SomeApp.ViewController.(createAddressBook(SomeApp.ViewController) -> () -> Swift.Bool).(closure #1)
3_Dispatch_call_block_and_release
4_dispatch_client_callout
5_dispatch_root_queue_drain
6_dispatch_worker_thread3
7_pthread_wqthread
Enqueued from com.apple.main-thread (Thread 1)
0_dispatch_async_f_slow
*>> 1_SomeApp.ViewController.createAddressBook(SomeApp.ViewController)() -> Swift.Bool [inlined]
2_SomeApp.ViewController.determineStatus(SomeApp.ViewController)() -> Swift.Bool
3_SomeApp.ViewController.loadContacts(SomeApp.ViewController() -> ()
4_SomeApp.ViewController.viewDidLoad(SomeApp.ViewController() -> ()
... etc Viewloading stuff
On the breakpoint, the two variables given in the debugger are
The addressbookref
adbk = (AnyObject?) (instance_type = Builtin.RawPointer = 0x... EvaluatingTo: Some
and the ViewController called "Self"
self(SomeApp.ViewController)
containing all the variables my app uses elsewhere.
Sorry for being so verbose, but I really don't know what of this is relevant and what isn't..
Thanks for your help in advance!
Update: I turned off multithreading/ dispatching and it didn't work. So it must be something to do with that tempPerson.firstname bit.
Update 2: It does go around the loop twice and get two contacts before failing. I think it is hitting a nil value that isn't quite nil for some of the contacts and then crashing.. I do have the following check for it though and it is passing through:
if ABRecordCopyValue(person, kABPersonFirstNameProperty).takeRetainedValue() as AnyObject? != nil{
&
if ABRecordCopyValue(person, kABPersonLastNameProperty).takeRetainedValue() as AnyObject? != nil{
respectively.
Update 3: Okay. So Now it seems whenever there is a blank field for first or last name it crashes (on the simulator now too). Which really sucks because I thought I put in a good check to make sure I am not accessing nil valued properties. Whats even more annoying is that I haven't changed this code and it was working fine until I removed some derived data and changed the test file to avoid a linker error. Anything that could happen in the build process that is mucking up my code?
Basically, you need to really check your type casts when accessing the addressbook, see:
tempPerson.lastname = ABRecordCopyValue(person, kABPersonLastNameProperty).takeRetainedValue() as NSObject as? String ?? ""
The problem is that some people have really dirty addressbooks for a variety of reasons and even have some mixed up properties like having a last name property that contains "LastName, FirstName SPACE Birthday" with no firstname property.
For whatever reason, typecasting first as an NSObject BEFORE as a String seems to work well.
Related
I'm stumped, iOS 11.4 ( 15F79 ), iPhone 6. Cannot get the App to Ask for Motion Data. info.plist has been set via the editor and double checked via the info.plist open in textWrangler, Also deleted key and saved via textWrangler.
<key>NSMotionUsageDescription</key>
<string>This app needs your Phones motion manager to update when the phone is tilted. Please allow this App to use your phones tilt devices</string>
I have deleted then reinstalled the app about 10 times. I have restared the phone 5 times. I have checked through settings and my app does NOT show up in Privacy-Motion and Fitness or anywhere else in settings. I am using a free developer account, maybe that has something to do with it?
I created a new Xcode game template and changed nothing apart from importing CoreMotion and this code
**** Edited, sorry I forgot to say I had started the instance, just forgot to put it here, just in case someone thinks that's the problem ************
let motionManager = CMMotionManager()
override func didMove(to view: SKView) {
motionManager.startDeviceMotionUpdates()
if motionManager.isDeviceMotionActive == true {
motionManager.accelerometerUpdateInterval = 0.2
motionManager.startAccelerometerUpdates(to: OperationQueue.current!, withHandler: {
(accelerometerData: CMAccelerometerData!, error: NSError!) in
let acceleration = accelerometerData.acceleration
print(accelerometerData)
} as! CMAccelerometerHandler)
}else{
print(CMMotionActivityManager.authorizationStatus().rawValue)
}
which prints a 0 ( an Enum - case not determined ) to the console.
In my actual app it was a 3 ( same Enum - case Denied ).
As I've said, I have uninstalled, reinstalled, edited plist via Xcode and text wrangler ( a code editor ) , tried different versions of the code above, tried the code in different places ( in did move to view, in class )tried code off apple docs. etc.... I haven't been asked the NSUsage question and the App keeps crashing.
I have looked for ways to get the Alert fired up, As in CLLocationManager.requestWhenInUseAuthorization() but I cannot find a comparable CMMotion version ( I don't think there is one. ) I have created a new swift file , imported Foundation and CMMotion and just put that code there, But still no Alert asking for Motion Data.
I tried a single view app template instead of a game template thinking that might be the issue, Nope.
What do I do?
Any help Appreciated. Thanks
You are confusing two related but different classes.
CMMotionManager gives access to accelerometer, magnetometer and gyroscope data. It does not require any user permission as this information is not considered privacy related.
In your else clause you are checking the authorisation status of CMMotionActivityManager. This object reports the device motion type (walking, running, driving). This information is considered privacy related and when you create an instance of this class and request data from it, the permissions alert is displayed.
The reason your else is being triggered is because you are checking isDeviceMotionActive; this will be false until you call startDeviceMotionUpdates, which you never do. Even if you used isAccelerometerActive you would have a problem because you call startAccelerometerUpdates in the if clause which will never be reached.
You probably meant to check isAccelerometerAvailable. If this returns false then there isn't much you can do; the device doesn't have an accelerometer.
Update
It doesn't make sense to check isDeviceMotionActive immediately after calling startDeviceMotion:
You know it's active; you just started it
I imagine the start up takes some time, so you could expect to get false if you check immediately.
Apple recommends that you do not have more than one observer in place for each motion device type, so the purpose of check the is...Active to ensure you don't call start... again if you have already done so.
If you only want gyroscope data then you don't need to call startDeviceMotionUpdates at all.
I tried googling this problem but it seems like everyone has the opposite problem where the app runs on simulator but not their device. I've been struggling a LOT all week with firebase asynchronous calls returning null and linked the issue to persistence being enabled. All my problems go away if I disable persistence, but I want it enabled. I learned recently about synchronous issues with the different listeners/persistence and have been struggling with firebase returning outdated/nil values for a while.
Simulator was working just a week or two ago and I'm not sure what's changed. I've tried messing with / switching out .observeSingleEvent for .observe and still crashes at this code:
let synced = ref.child("profiles").child((FIRAuth.auth()?.currentUser?.uid)!).child("level")
synced.observeSingleEvent(of: FIRDataEventType.value, with: { (snapshot) in
print(snapshot)
print(snapshot.ref)
if (snapshot.value as! String == "One") {
........//CRASH
With the message:
Could not cast value of type 'NSNull' (0x10b7cf8c8) to 'NSString' (0x10a9dfc40).
When I try to print snapshot, it shows me an empty snapshot. But when I print the ref, the link works and takes me to the right place in my db (where I can see the data exists)
Any ideas how to fix/get around this without disabling persistence? Or more importantly I guess, should I care that it doesn't work in simulator if it works on a device? Will this matter for app store approval / affect future users?
If you'd like to see for yourself that this is an issue of firebase getting a nil/outdated value when the reference exists, here is what I see when I follow the printed ref link
The error seems fairly explicit: there is no value, so you can't convert it to a string.
synced.observeSingleEvent(of: FIRDataEventType.value, with: { (snapshot) in
if (snapshot.exists()) {
if (snapshot.value as! String == "One") {
........//CRASH
I use SKProductsRequest to download product infos from App Store.
When I test a connectivity loss on my device, the request fails, but my app crashes within the SKRequestDelegate when I try to NSLog the error:
What am I doing wrong ? Another curious thing to me is that Expression Inspector is able to display NSError.debugDescription...
It fails on the first request, so there is no possible bug relative to multiple uses of productRequest variable (which is a strong ref in my swift class).
I finally found the reason. It is not related to SKProductsRequest!
I think there is a nasty bug with NSLogand string interpolation because when I replace:
NSLog("Failed: \(error.debugDescription)")
by
print("Failed: \(error.debugDescription)")
all is fine!
Apparently, the content of the error message can provoke a EXC_BAD_ADDRESS in NSLog (even without string interpolation in fact: NSLog(error.debugDescription) fails too).
Related anwser: https://stackoverflow.com/a/29631505/249742
NSLog("%#", error.debugDescription)
seems to work fine in every cases.
Perhaps NSLog(variable) is a misuse of NSLog, but I think NSLog(\(variable)) should be interpreted like NSLog("%#", variable). Else, there is no reliable way to interpolate strings with NSLog using the swift way \().
I'm using a Parse Cloud function to get a list of movies. This was all working very well till today. The app crashes and I can't seem to fix it.
Weird (and highly problematic) thing is that it did work yesterday and the days before. (This app is in production in the App store)
This is the function causing the error:
PFCloud.callFunctionInBackground(function, withParameters: parameters) { (movies, error) -> Void in
if error != nil { return block(success: false, movies: []) }
PFObject.pinAllInBackground(movies as! [PFObject])
let foundMovies = ParseMovie.arrayFromPFObjects(movies as! [PFObject])
return block(success: true, movies: foundMovies)
}
If I comment the 4 lines inside the block, it still crashes. If I comment the entire function, it doesn't. So it seems as soon as I call "PFCloud.callFunction" the app crashes.
Any idea what can go wrong? The Parse cloud function does work, because calling it with the parse rest API gives me the movies as expected.
Any help is appreciated, thanks!
Ok, got it. Apparently I'm using an old version of the Parse SDK (1.5) and since today, this version is not working anymore.. I'm not using pods so I was not aware of this out-dated version. A bit disappointed, but probably my fault?
I have created an iOS app using Swift and everything is working fine and dandy on the simulator. I get no errors or crashes at all, but when I submit my app to put up on the app store Apple rejects it and lets me know that it crashes when the user makes a selection. I cannot recreate this error/crash. I took the crash logs and symbolicated them. This line of code came up as the culprit for the crashes:
linksToPass = getLinks(season) as [String:[String]]
This line is trying to store the resulting Dictionary from the getLinks() function I created. It for sure is getting a dictionary and if there is no dictionary to send back I create a dictionary which has error information in it, so it is for sure returning a dictionary in that format no matter what. Seeing as I cannot recreate the crash, I am just trying to error check this line of code in any way possible so it does't crash when I resubmit to Apple.
I tried checking if the resulting dictionary was nil like so:
if(getLinks(seasons) != nil){
linksToPass = getLinks(season) as [String:[String]]
}
This is not valid though, and XCode lets me know that UInt8 is not compatible with NSDictionary or something of that nature.
I then fixed that line and changed it to this:
if(getLinks(seasons) != ["":[""]]){
linksToPass = getLinks(season) as [String:[String]]
}
I am just not sure if this is even a good way to check for errors. I was wondering if there were any suggestions on how I may go about making sure this line does not fail and result in a crash. Thank you very much.
EDIT:
Here is my getLinks() function if that helps add more info to the problem:
var season = ""
let hymn_links = Hymn_Links()
func getLinks (nameofseason:String) -> NSDictionary
{
switch (nameofseason)
{
default:
return ["Maps Not Found": []]
}
}
EDIT #2:
This is my updated getLinks() function with the use of optionals.
func getLinks (nameofseason:String) -> NSDictionary?
{
switch (nameofseason)
{
default:
return nil
}
}
Also in my statement of linksToPass I changed it to:
if let links = getLinks(season) as? [String:[String]]
{
linksToPass = links
hymnnames = [String] (linksToPass.keys)
}
There are some known issues with the Swift optimiser. Some people have resorted to shipping with debug builds.
My suggestion would be to test with an optimised build to see if you can reproduce it. You can then try shipping a debug build to the App store.
General Code Comments
Why are you returning an NSDictionary rather than a Swift dictionary anyway? Without knowing the contents and creation method for your hymn_links object I can't be sure how good it is.
I would avoid as casts until Swift 1.2 and stick to using as? and then handling the nil case. At least in your "Edit 2" a nil will cause a crash as nil cannot be cast to [String:[String]] although [String:[String]]? should be possible.
Can you guarantee that all of the items returned by the switch statement will never under any circumstances be nil? If not getLinks should return an Optional.
Note that is is virtually impossible for getLinks to know that one of the items will never be nil and in Swift un-handed nils are a crash waiting to happen. Unless all these methods correctly handle nil.
Return an Optional and handle that in the statement that calls getLinks.
Languages handle nils differently, Objective-C handles them rather well, Java and Swift by crashing. But Swift has a mechanism to handle nils without crashing: Optionals, use it.