XCode调试技巧之EXC_BAD_ACCESS中BUG解决
1、通过编辑Edit Scheme，选择Diagnostics，勾选Enable Zombie Objects & Malloc Stack（注意、调试完毕后必须取消勾选，因为Zombile模式不会释放内存，很危险）
2、重新run你的程序，reproduce crash流程，控制台会输出如下log:
3、由于最新的Xcode不支持GDB模式在控制台输入指令，所以我们这里打开Max OS上的终端程序，输入指令：
malloc_history 3774 0x7d121870
注意：这里的3774对应控制台log的MobileFlagship后面的第一组数字，这个是你crash的pid号，别搞错了
后面的地址就不用说了，自己copy
4、输入完指令后，终端会输出相关的历史信息：
Last login: Sat May 2 10:26:34 on ttys003
wurongbiaos-Mac-mini:~ wurongbiao$ malloc_history 3774 0x7d121870
malloc_history Report Version: 2.0
Process: MobileFlagship [3774]
Path: /Users/wurongbiao/Library/Developer/CoreSimulator/Devices/1A5BC93D-EDC2-44E4-8D0D-21253866FDEC/data/Containers/Bundle/Application/E0532AFD-4997-4DBE-881C-D297E1942FE6/MobileFlagship.app/MobileFlagship
Load Address: 0x58000
Identifier: MobileFlagship
Version: ???
Code Type: X86
Parent Process: debugserver [3775]
Date/Time: 2015-05-02 11:26:43.628 +0800
OS Version: Mac OS X 10.10.2 (14C1510)
Report Version: 7
Analysis Tool: /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator.sdk/usr/bin/malloc_history
Analysis Tool Version: iOS Simulator 8.1 (12B411)
----
Invalid connection: com.apple.coresymbolicationd
ALLOC 0x7d121870-0x7d1218ef [size=128]: thread_4fd11d4 |start | main | UIApplicationMain | GSEventRun | GSEventRunModal | CFRunLoopRunInMode | CFRunLoopRunSpecific | __CFRunLoopRun | __CFRunLoopDoSources0 | __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ | _UIApplicationHandleEventQueue | +[CATransaction flush] | CA::Transaction::commit() | CA::Context::commit_transaction(CA::Transaction*) | CA::Layer::layout_and_display_if_needed(CA::Transaction*) | CA::Layer::layout_if_needed(CA::Transaction*) | -[CALayer layoutSublayers] | -[NSObject performSelector:withObject:] | -[UIView(CALayerDelegate) layoutSublayersOfLayer:] | -[UILayoutContainerView layoutSubviews] | -[UINavigationController __viewWillLayoutSubviews] | -[UINavigationController _startDeferredTransitionIfNeeded:] | -[UINavigationController _startCustomTransition:] | -[UIViewController view] | -[UIViewController loadViewIfRequired] | -[MyMobileViewController viewDidLoad] | -[MyMobileViewController initTheView] | -[MyMobileViewController initTheFourthView] | -[NSBundle(UINSBundleAdditions) loadNibNamed:owner:options:] | -[UINib instantiateWithOwner:options:] | -[UINibDecoder decodeObjectForKey:] | UINibDecoderDecodeObjectForValue | UINibDecoderDecodeObjectForValue | -[UIRuntimeEventConnection initWithCoder:] | -[UIRuntimeConnection initWithCoder:] | -[UINibDecoder decodeObjectForKey:] | UINibDecoderDecodeObjectForValue | -[UIClassSwapper initWithCoder:] | -[UIView initWithCoder:] | -[UINibDecoder decodeObjectForKey:] | UINibDecoderDecodeObjectForValue | UINibDecoderDecodeObjectForValue | -[UIImageView initWithCoder:] | -[UINibDecoder decodeObjectForKey:] | UINibDecoderDecodeObjectForValue | -[UIImageNibPlaceholder initWithCoder:] | _UIImageAtPath | _UICacheNameForImageAtPath | +[NSString stringWithFormat:] | -[NSPlaceholderString initWithFormat:locale:arguments:] | _CFStringCreateWithFormatAndArgumentsAux2 | __CFStringAppendFormatCore | CFStringAppend | __CFStringChangeSizeMultiple | CFAllocatorAllocate | __CFAllocatorSystemAllocate | malloc_zone_malloc
----
FREE 0x7d121870-0x7d1218ef [size=128]: thread_4fd11d4 |start | main | UIApplicationMain | GSEventRun | GSEventRunModal | CFRunLoopRunInMode | CFRunLoopRunSpecific | __CFRunLoopRun | __CFRunLoopDoSources0 | __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ | _UIApplicationHandleEventQueue | +[CATransaction flush] | CA::Transaction::commit() | CA::Context::commit_transaction(CA::Transaction*) | CA::Layer::layout_and_display_if_needed(CA::Transaction*) | CA::Layer::layout_if_needed(CA::Transaction*) | -[CALayer layoutSublayers] | -[NSObject performSelector:withObject:] | -[UIView(CALayerDelegate) layoutSublayersOfLayer:] | -[UILayoutContainerView layoutSubviews] | -[UINavigationController __viewWillLayoutSubviews] | -[UINavigationController _startDeferredTransitionIfNeeded:] | -[UINavigationController _startCustomTransition:] | -[UIViewController view] | -[UIViewController loadViewIfRequired] | -[MyMobileViewController viewDidLoad] | -[MyMobileViewController initTheView] | -[MyMobileViewController initTheFourthView] | -[NSBundle(UINSBundleAdditions) loadNibNamed:owner:options:] | -[UINib instantiateWithOwner:options:] | -[UINibDecoder decodeObjectForKey:] | UINibDecoderDecodeObjectForValue | UINibDecoderDecodeObjectForValue | -[UIRuntimeEventConnection initWithCoder:] | -[UIRuntimeConnection initWithCoder:] | -[UINibDecoder decodeObjectForKey:] | UINibDecoderDecodeObjectForValue | -[UIClassSwapper initWithCoder:] | -[UIView initWithCoder:] | -[UINibDecoder decodeObjectForKey:] | UINibDecoderDecodeObjectForValue | UINibDecoderDecodeObjectForValue | -[UIImageView initWithCoder:] | -[UINibDecoder decodeObjectForKey:] | UINibDecoderDecodeObjectForValue | -[UIImageNibPlaceholder initWithCoder:] | _UIImageAtPath | _UICacheNameForImageAtPath | +[NSString stringWithFormat:] | -[NSPlaceholderString initWithFormat:locale:arguments:] | _CFStringCreateWithFormatAndArgumentsAux2 | __CFStringAppendFormatCore | CFStringAppend | __CFStringChangeSizeMultiple | CFAllocatorDeallocate | __CFAllocatorSystemDeallocate | malloc_zone_free
ALLOC 0x7d121870-0x7d12189f [size=48]: thread_4fd11d4 |start | main | UIApplicationMain | GSEventRun | GSEventRunModal | CFRunLoopRunInMode | CFRunLoopRunSpecific | __CFRunLoopRun | __CFRunLoopDoSources0 | __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ | _UIApplicationHandleEventQueue | +[CATransaction flush] | CA::Transaction::commit() | CA::Context::commit_transaction(CA::Transaction*) | CA::Layer::layout_and_display_if_needed(CA::Transaction*) | CA::Layer::layout_if_needed(CA::Transaction*) | -[CALayer layoutSublayers] | -[NSObject performSelector:withObject:] | -[UIView(CALayerDelegate) layoutSublayersOfLayer:] | -[UILayoutContainerView layoutSubviews] | -[UINavigationController __viewWillLayoutSubviews] | -[UINavigationController _startDeferredTransitionIfNeeded:] | -[UINavigationController _startCustomTransition:] | -[UIViewController view] | -[UIViewController loadViewIfRequired] | -[MyMobileViewController viewDidLoad] | -[MyMobileViewController initTheView] | -[MyMobileViewController initTheFourthView] | -[NSBundle(UINSBundleAdditions) loadNibNamed:owner:options:] | -[UINib instantiateWithOwner:options:] | -[UINibDecoder decodeObjectForKey:] | UINibDecoderDecodeObjectForValue | UINibDecoderDecodeObjectForValue | -[UIRuntimeEventConnection initWithCoder:] | -[UIRuntimeConnection initWithCoder:] | -[UINibDecoder decodeObjectForKey:] | UINibDecoderDecodeObjectForValue | -[UIClassSwapper initWithCoder:] | -[UIView initWithCoder:] | -[UINibDecoder decodeObjectForKey:] | UINibDecoderDecodeObjectForValue | UINibDecoderDecodeObjectForValue | -[UIImageView initWithCoder:] | -[UIView initWithCoder:] | UIViewCommonInitWithFrame | -[UIView _createLayerWithFrame:] | _objc_rootAlloc | class_createInstance | calloc | malloc_zone_calloc
Binary Images:
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0xe456000 - 0xe464ff3 com.apple.corerecents (1.0 - 1) <0F06DA73-AA47-3EE5-AC50-102F05AE59B6> /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator.sdk/System/Library/PrivateFrameworks/CoreRecents.framework/CoreRecents
0xe473000 - 0xe475ff3 com.apple.ftclientservices (10.0 - 1000)
0xe47b000 - 0xe54dff7 com.apple.imcore (10.0 - 1000)
0xe581000 - 0xe583fff com.apple.marco (10.0 - 1000)
0xe589000 - 0xe5bafff com.apple.facetimeservices (10.0 - 1000) <8B5A9AD0-58EC-375F-BFD8-10A72D444857> /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator.sdk/System/Library/PrivateFrameworks/FTServices.framework/FTServices
0xe5cc000 - 0xe643fff com.apple.ids (10.0 - 1000) <9A89CB0E-B6BD-322E-80B5-EECAC4B1D3F9> /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator.sdk/System/Library/PrivateFrameworks/IDS.framework/IDS
0xe663000 - 0xe665fff com.apple.diagnosticlogcollection (10.0 - 1000)
0xe66b000 - 0xe68fff3 com.apple.idsfoundation (10.0 - 1000) <4D155C77-07EB-3903-9583-4DFF60B753F0> /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator.sdk/System/Library/PrivateFrameworks/IDSFoundation.framework/IDSFoundation
0xe6d5000 - 0xe6e1fff +libGSFontCache.dylib (206.81)
0xe785000 - 0xe78bffb com.apple.ConstantClasses (1.0 - 1) <7905A016-CFF8-359D-AD3B-1C97B704FD21> /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator.sdk/System/Library/PrivateFrameworks/ConstantClasses.framework/ConstantClasses
0xe794000 - 0xe797ffb +libCGXType.A.dylib (747.1) <2C77F195-BCD8-377D-877D-7A7165118AEC> /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator.sdk/System/Library/Frameworks/CoreGraphics.framework/Resources/libCGXType.A.dylib
0x101de000 - 0x1020ffff com.apple.CoreServicesInternal (220 - 220) <5DD528D7-115E-3854-A44A-97E9B46A7081> /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator.sdk/System/Library/PrivateFrameworks/CoreServicesInternal.framework/CoreServicesInternal
0x12e3a000 - 0x12e63ff7 +libRIP.A.dylib (747.1)
0x12e72000 - 0x12e80ff7 +libCMSBuiltin.A.dylib (747.1) <73B3DD66-BD25-31C9-ACDB-4574CBAB0712> /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator.sdk/System/Library/Frameworks/CoreGraphics.framework/Resources/libCMSBuiltin.A.dylib
0x8fe1f000 - 0x8fe52e03 dyld (0.0 - ???) <06B1254D-9BB9-327C-BA15-8F18FFF97586> /usr/lib/dyld
5、抱歉刷频这么多，直接复制过来的，这里和我们debug有关的就是开头那里的ALLOC段落：
ALLOC 0x7d121870-0x7d1218ef [size=128]: thread_4fd11d4 |start | main | UIApplicationMain | GSEventRun | GSEventRunModal | CFRunLoopRunInMode | CFRunLoopRunSpecific | __CFRunLoopRun | __CFRunLoopDoSources0 | __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ | _UIApplicationHandleEventQueue | +[CATransaction flush] | CA::Transaction::commit() | CA::Context::commit_transaction(CA::Transaction*) | CA::Layer::layout_and_display_if_needed(CA::Transaction*) | CA::Layer::layout_if_needed(CA::Transaction*) | -[CALayer layoutSublayers] | -[NSObject performSelector:withObject:] | -[UIView(CALayerDelegate) layoutSublayersOfLayer:] | -[UILayoutContainerView layoutSubviews] | -[UINavigationController __viewWillLayoutSubviews] | -[UINavigationController _startDeferredTransitionIfNeeded:] | -[UINavigationController _startCustomTransition:] | -[UIViewController view] | -[UIViewController loadViewIfRequired] | -[MyMobileViewController viewDidLoad] | -[MyMobileViewController initTheView] | -[MyMobileViewController initTheFourthView] | -[NSBundle(UINSBundleAdditions) loadNibNamed:owner:options:] | -[UINib instantiateWithOwner:options:] | -[UINibDecoder decodeObjectForKey:] | UINibDecoderDecodeObjectForValue | UINibDecoderDecodeObjectForValue | -[UIRuntimeEventConnection initWithCoder:] | -[UIRuntimeConnection initWithCoder:] | -[UINibDecoder decodeObjectForKey:] | UINibDecoderDecodeObjectForValue | -[UIClassSwapper initWithCoder:] | -[UIView initWithCoder:] | -[UINibDecoder decodeObjectForKey:] | UINibDecoderDecodeObjectForValue | UINibDecoderDecodeObjectForValue | -[UIImageView initWithCoder:] | -[UINibDecoder decodeObjectForKey:] | UINibDecoderDecodeObjectForValue | -[UIImageNibPlaceholder initWithCoder:] | _UIImageAtPath | _UICacheNameForImageAtPath | +[NSString stringWithFormat:] | -[NSPlaceholderString initWithFormat:locale:arguments:] | _CFStringCreateWithFormatAndArgumentsAux2 | __CFStringAppendFormatCore | CFStringAppend | __CFStringChangeSizeMultiple | CFAllocatorAllocate | __CFAllocatorSystemAllocate | malloc_zone_malloc
可以看到，我这里的主要问题出现在代码段：
[MyMobileViewController viewDidLoad] | -[MyMobileViewController initTheView] | -[MyMobileViewController initTheFourthView] |
6、到相关的类里找到对应的方法，打断点调试吧！这里离解决问题已经很近很近了！调试完最后别忘记关闭Zombile和malloc