applicationWillEnterForeground时崩溃
试图使用僵尸对象，但不起作用
Exception Type: EXC_BAD_ACCESS (SIGSEGV)
Exception Subtype: KERN_INVALID_ADDRESS at 0x6565656565656569
VM Region Info: 0x6565656565656569 is not in any region. Bytes after previous region: 7306357445371454826
REGION TYPE START - END [ VSIZE] PRT/MAX SHRMOD REGION DETAIL
MALLOC_NANO 0000000280000000-00000002a0000000 [512.0M] rw-/rwx SM=PRV
--->
UNUSED SPACE AT END
Triggered by Thread: 0
Thread 0 name: Dispatch queue: com.apple.main-thread
Thread 0 Crashed:
0 QuartzCore 0x00000001addf8954 CA::Layer::sublayers+ 1411412 () + 52
1 UIKitCore 0x00000001ab8eea9c _makeSubTreePerformSelector + 228
2 UIKitCore 0x00000001ab8eea9c _makeSubTreePerformSelector + 228
3 UIKitCore 0x00000001ab4ada0c -[UIWindow dealloc] + 144
4 libobjc.A.dylib 0x00000001a71aa3a4 _object_remove_assocations + 352
5 libobjc.A.dylib 0x00000001a71a6d20 objc_destructInstance + 100
6 libobjc.A.dylib 0x00000001a71addb8 _objc_rootDealloc + 48
7 QuartzCore 0x00000001adde9dc4 -[CALayer dealloc] + 416
8 QuartzCore 0x00000001add730bc CA::release_objects+ 864444 (X::List<void const*>*) + 32
9 QuartzCore 0x00000001ade00520 CA::Layer::free_transaction+ 1443104 (CA::Transaction*) + 412
10 QuartzCore 0x00000001add73990 CA::Transaction::commit+ 866704 () + 932
11 UIKitCore 0x00000001ab4a25d4 _afterCACommitHandler + 140
12 CoreFoundation 0x00000001a73e9c48 __CFRUNLOOP_IS_CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION__ + 32
13 CoreFoundation 0x00000001a73e4b34 __CFRunLoopDoObservers + 416
14 CoreFoundation 0x00000001a73e5100 __CFRunLoopRun + 1308
15 CoreFoundation 0x00000001a73e48bc CFRunLoopRunSpecific + 464
16 GraphicsServices 0x00000001b124f328 GSEventRunModal + 104
17 UIKitCore 0x00000001ab4796d4 UIApplicationMain + 1936
18 FuturesApp 0x0000000104cde230 main + 6087216 (main.m:14)
19 libdyld.dylib 0x00000001a726f460 start + 4
Thread 1 name: com.apple.uikit.eventfetch-thread
Thread 1:
0 libsystem_kernel.dylib 0x00000001a72435f4 mach_msg_trap + 8
1 libsystem_kernel.dylib 0x00000001a7242a60 mach_msg + 72
2 CoreFoundation 0x00000001a73ea068 __CFRunLoopServiceMachPort + 216
3 CoreFoundation 0x00000001a73e5188 __CFRunLoopRun + 1444
4 CoreFoundation 0x00000001a73e48bc CFRunLoopRunSpecific + 464
5 Foundation 0x00000001a7724994 -[NSRunLoop+ 31124 (NSRunLoop) runMode:beforeDate:] + 228
6 Foundation 0x00000001a7724874 -[NSRunLoop+ 30836 (NSRunLoop) runUntilDate:] + 88
7 UIKitCore 0x00000001ab51149c -[UIEventFetcher threadMain] + 152
8 Foundation 0x00000001a78550b0 __NSThread__start__ + 848
9 libsystem_pthread.dylib 0x00000001a71891ec _pthread_start + 124
10 libsystem_pthread.dylib 0x00000001a718caec thread_start + 8
Thread 2 name: JavaScriptCore bmalloc scavenger
Thread 2:
0 libsystem_kernel.dylib 0x00000001a7264c8c __psynch_cvwait + 8
1 libsystem_pthread.dylib 0x00000001a71864e0 _pthread_cond_wait$VARIANT$armv81 + 676
2 libc++.1.dylib 0x00000001a72b67a8 std::__1::condition_variable::wait+ 59304 (std::__1::unique_lock<std::__1::mutex>&) + 24
3 JavaScriptCore 0x00000001b60413fc void std::__1::condition_variable_any::wait<std::__1::unique_lock<bmalloc::Mutex> >+ 558076 (std::__1::unique_lock<bmalloc::Mutex>&) + 108
4 JavaScriptCore 0x00000001b6044dcc bmalloc::Scavenger::threadRunLoop+ 572876 () + 200
5 JavaScriptCore 0x00000001b6044ab4 bmalloc::Scavenger::Scavenger+ 572084 (std::__1::lock_guard<bmalloc::Mutex>&) + 0
6 JavaScriptCore 0x00000001b6045dc0 std::__1::__thread_specific_ptr<std::__1::__thread_struct>::set_pointer+ 576960 (std::__1::__thread_struct*) + 0
7 libsystem_pthread.dylib 0x00000001a71891ec _pthread_start + 124
8 libsystem_pthread.dylib 0x00000001a718caec thread_start + 8
Thread 3 name: Dispatch queue: com.apple.root.default-qos
Thread 3:
0 libsystem_kernel.dylib 0x00000001a7264cdc __psynch_mutexwait + 8
1 libsystem_pthread.dylib 0x00000001a71871a0 _pthread_mutex_firstfit_lock_wait + 92
2 libsystem_pthread.dylib 0x00000001a7187110 _pthread_mutex_firstfit_lock_slow$VARIANT$armv81 + 260
3 Foundation 0x00000001a773cdf4 -[NSRecursiveLock lock] + 24
4 FuturesApp 0x00000001056dae30 __24-[TKHeartChecker start:]_block_invoke.91 + 36
5 libdispatch.dylib 0x00000001a7139610 _dispatch_call_block_and_release + 24
6 libdispatch.dylib 0x00000001a713a184 _dispatch_client_callout + 16
7 libdispatch.dylib 0x00000001a7113b7c _dispatch_queue_override_invoke + 668
8 libdispatch.dylib 0x00000001a7120110 _dispatch_root_queue_drain + 344
9 libdispatch.dylib 0x00000001a71208b0 _dispatch_worker_thread2 + 116
10 libsystem_pthread.dylib 0x00000001a7189f64 _pthread_wqthread + 212
11 libsystem_pthread.dylib 0x00000001a718cae0 start_wqthread +
