objective c - release Vs free - why won’t the ARC version of an iOS audio app exit gracefully? -


i’m revising audio app. when converted arc discovered old code release timer, audio session , devicemotion deprecated. xcode suggests replacing release free i’m having trouble making audio session release properly.

edit believe question has been answered here.

here code

- (void)fromescbutton:(uibutton*)button {     [self stopclock];     [self exitgracefully];     [self gotoglobal]; }  - (void)stopclock {     [_synthlock lock];     [_synth stopallnotes];     [_player stop];     [motionlistener stopmotionlistener];     [_synthlock unlock];     [timer invalidate];     timer = nil; }  -(void)exitgracefully {     free((__bridge void *)(lasteventchangetime));   //  [lasteventchangetime release];     free((__bridge void *)(timer));                 //  [timer release];     free((__bridge void *)(motionlistener));        //  [motionlistener release];     free((__bridge void *)(player));                //  [player release];     free((__bridge void *)(_synth));                //  [synth release];     free((__bridge void *)(_synthlock));            //  [synthlock release]; }  - (void)gotoglobal {     multiviewappdelegate *appdelegate = [[uiapplication sharedapplication] delegate];     [appdelegate displayview:display_help]; }

the method exitgracefully (above) shows way free compile. don’t understand (__bridge void *) suspect might wrong.

when hit escape button, clock , sound stop app lingers buffers running , crashes

2017-08-18 08:51:30.015004+1000 satgam2[4846:577981] [aqme] 254: aqdefaultdevice (173): skipping input stream 0 0 0x0 2017-08-18 08:51:32.023461+1000 satgam2[4846:577981] [aqme] 254: aqdefaultdevice (173): skipping input stream 0 0 0x0 2017-08-18 08:51:34.031960+1000 satgam2[4846:577981] [aqme] 254: aqdefaultdevice (173): skipping input stream 0 0 0x0 2017-08-18 08:51:35.474 satgam2[4846:576397] esc button                  (2)  (lldb) bt satgam2 compiled optimization - stepping may behave oddly; variables may not available. * thread #9, name = 'com.apple.coreaudio.aqclient', stop reason = exc_bad_access (code=1, address=0xb000000c) frame #0: 0x0318c4b6 libobjc.a.dylib`objc_msgsend + 14   * frame #1: 0x000f9452 satgam2`__39-[playviewcontroller startaudiosession]_block_invoke((null)=0x78f3b6b0, buffer=<unavailable>, audioformat=audiostreambasicdescription @ 0xb0a25ab8) @ playviewcontroller.m:347 [opt] frame #2: 0x000f7d87 satgam2`playcallback(inuserdata=0x7ab30970, inaudioqueue=<unavailable>, inbuffer=<unavailable>) @ audiobufferplayer.m:30 [opt]

the message in frame #2 inaudioqueue=<unavailable>, inbuffer=<unavailable> suggests audio session found synth , player have stopped.

edits

  1. i commented out method exitgracefully allowing arc manage release on own. symptoms continue until crashed different message

    frame #2: 0x000d9d90 satgam2`-[playviewcontroller .cxx_destruct](self=0x7e249000, _cmd=".cxx_destruct") @ playviewcontroller.m:20 [opt]

playviewcontroller mentioned in xcode log viewcontroller running before crash. simulator shows app has switched new viewcontroller (the new tenant complaining rubbish left previous tenant ?)

  1. i set pointers nil (as suggested marcio). crashed same way again different message 

    frame #2: 0x000000010c6c6e6d satgam2`__39-[playviewcontroller startaudiosession]_block_invoke((null)=<unavailable>, buffer=0x00006000002e1500, audioformat=audiostreambasicdescription @ 0x000070000c31e920) @ playviewcontroller.m:353 [opt]

the question might be: can message - [playviewcontroller startaudiosession]_block_invoke((null)=<unavailable> - explain why arc cannot handle condition ?

can explain latest crash , audio player exit gracefully ?

thanks in anticipation.


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