swift memory issues since iOS 11 or iOS 10.3 -


enter image description herei have app using geofencing , beacons since 1 year in app store. noticed more , more crashes , users reporting of missing notifications upon geofence entry or exit ( send local notification upon entry or exit). suspect crash reports related user reports. crash reports indicate memory management issues: lib dispatch.dylib _dispatch_callblock_and_release

these problem occur since ios 10.3. have reports ios 10.3 of them ios 11. when run app in simulator memory usage @ around 50mb , not increase. when simulate geofence entry , exit etc stays around 50 mb usage.

so first question possible app crashes when not in foreground when uses 50mb?

to investigate further implemented function func applicationdidreceivememorywarning(_ application: uiapplication) , send local notification when get´s called. , indeed sometimes warning , myself have irregularities geofence enter , exit notifications.

now further investigate installed app monitor same geofence (ifttt). here have irregularities geofence enter , exit notifications.

until quite relaxed sure it´s ios 11 beta´s have memory management issue. i´m using latest beta (15a5372a) , guess close final now. worries me users experience these issues ios 10.3.

any ideas how investigate further or experience similar?

very best stephan

edit: today again experience strange behaviour ios 11 golden master. yesterday afternoon @ around 16:30 arrived home. ifttt didenterregion not triggered. or @ least did not notification. when left home morning got exit notification @ same time enter yesterday. i´m suspecting general change in memory allocation ios 11 has when apps run in background.

edit:

i did further investiagation.. implemented method applicationdidreceivememorywarning , displayed waring beta testers.

here´s code:

func applicationdidreceivememorywarning(_ application: uiapplication) {      let memoryinuse = report_memory()      let notification = uilocalnotification()     notification.alertbody = "memorywarning. memory in use: \(memoryinuse)"     notification.soundname = "default"     uiapplication.shared.presentlocalnotificationnow(notification)      print("memorywarning. memory in use: \(memoryinuse)")  }

to see how memory application using have function:

func report_memory() -> string {     var taskinfo = mach_task_basic_info()     var count = mach_msg_type_number_t(memorylayout<mach_task_basic_info>.size)/4     let kerr: kern_return_t = withunsafemutablepointer(to: &taskinfo) {         $0.withmemoryrebound(to: integer_t.self, capacity: 1) {             task_info(mach_task_self_, task_flavor_t(mach_task_basic_info), $0, &count)         }     }      if kerr == kern_success {         print("memory used in bytes: \(taskinfo.resident_size)")     }     else {         print("error task_info(): " +             (string(cstring: mach_error_string(kerr), encoding: string.encoding.ascii) ?? "unknown error"))         return "error"     }      let mbinuse = taskinfo.resident_size / 1000000      return string(mbinuse) + " mb" }

i got first feedbacks users. memory waringing between 7 , 18mb reported function report_memory().

so i´m scratching head if either code wrong , memory in use not reported correctly or if it´s possible iphone 6 or 7 report memory warning when app using 7mb while being active in background (while entering geofence or beacon region).

many stephan


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