我在开发中遇到的bug

1.仿作91助手的时候，网络连接的时候没有崩溃，断开网络后运行时在点击搜索这个tabBar出现如下崩溃信息

崩溃信息：

*** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: 'data parameter is nil'

*** First throw call stack:

(

0   CoreFoundation                      0x0000000102da1e65 __exceptionPreprocess + 165

1   libobjc.A.dylib                     0x000000010281adeb objc_exception_throw + 48

2   CoreFoundation                      0x0000000102da1d9d +[NSException raise:format:] + 205

3   Foundation                          0x000000010250d089 +[NSJSONSerialization JSONObjectWithData:options:error:] + 67

4   AppÂä©Êâã                           0x000000010215bbb3 __52-[SearchTableViewController getrecommendDatafromnet]_block_invoke + 147

5   CFNetwork                           0x0000000104fb56b5 __75-[__NSURLSessionLocal taskForClass:request:uploadFile:bodyData:completion:]_block_invoke + 19

6   CFNetwork                           0x0000000104fc7a02 __49-[__NSCFLocalSessionTask _task_onqueue_didFinish]_block_invoke + 302

7   Foundation                          0x000000010248f304 __NSBLOCKOPERATION_IS_CALLING_OUT_TO_A_BLOCK__ + 7

8   Foundation                          0x00000001023cb035 -[NSBlockOperation main] + 101

9   Foundation                          0x00000001023adf8a -[__NSOperationInternal _start:] + 646

10  Foundation                          0x00000001023adb9b __NSOQSchedule_f + 194

11  libdispatch.dylib                   0x000000010562d49b _dispatch_client_callout + 8

12  libdispatch.dylib                   0x00000001056138ec _dispatch_queue_drain + 2215

13  libdispatch.dylib                   0x0000000105612e0d _dispatch_queue_invoke + 601

14  libdispatch.dylib                   0x0000000105615a56 _dispatch_root_queue_drain + 1420

15  libdispatch.dylib                   0x00000001056154c5 _dispatch_worker_thread3 + 111

16  libsystem_pthread.dylib             0x000000010596568f _pthread_wqthread + 1129

17  libsystem_pthread.dylib             0x0000000105963365 start_wqthread + 13

)

libc++abi.dylib: terminating with uncaught exception of type NSException

(lldb) 

出错原因：断开网络获得的数据参数是nil所以崩溃了

解决方法：

加全局断点，定位出错点

2.

崩溃信息：

 *** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'Application windows are expected to have a root view controller at the end of application launch'

*** First throw call stack:

(

0   CoreFoundation                      0x000000010dbb1e65 __exceptionPreprocess + 165

1   libobjc.A.dylib                     0x000000010d2a1deb objc_exception_throw + 48

2   CoreFoundation                      0x000000010dbb1cca +[NSException raise:format:arguments:] + 106

3   Foundation                          0x000000010ceee4de -[NSAssertionHandler handleFailureInMethod:object:file:lineNumber:description:] + 198

4   UIKit                               0x000000010df5d218 -[UIApplication _runWithMainScene:transitionContext:completion:] + 3122

5   UIKit                               0x000000010df59e7b -[UIApplication workspaceDidEndTransaction:] + 188

6   FrontBoardServices                  0x0000000111e33754 -[FBSSerialQueue _performNext] + 192

7   FrontBoardServices                  0x0000000111e33ac2 -[FBSSerialQueue _performNextFromRunLoopSource] + 45

8   CoreFoundation                      0x000000010dadda31 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 17

9   CoreFoundation                      0x000000010dad395c __CFRunLoopDoSources0 + 556

10  CoreFoundation                      0x000000010dad2e13 __CFRunLoopRun + 867

11  CoreFoundation                      0x000000010dad2828 CFRunLoopRunSpecific + 488

12  UIKit                               0x000000010df597cd -[UIApplication _run] + 402

13  UIKit                               0x000000010df5e610 UIApplicationMain + 171

14  ‰ªø91                               0x000000010cd695af main + 111

15  libdyld.dylib                       0x00000001101c192d start + 1

)

libc++abi.dylib: terminating with uncaught exception of type NSException

(lldb) 

出错原因：应用程序在运行时没有设置根视图控制器

解决方法：

设置根视图控制器

3.

崩溃信息：

2016-03-21 00:09:39.896 GIFShow[31818:3506360] -[__NSArray0 objectForKeyedSubscript:]: unrecognized selector sent to instance 0x7fad60d02670

2016-03-21 00:09:39.898 GIFShow[31818:3506360] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[__NSArray0 objectForKeyedSubscript:]: unrecognized selector sent to instance 0x7fad60d02670'

*** First throw call stack:

(

0   CoreFoundation                      0x0000000104e34e65 __exceptionPreprocess + 165

1   libobjc.A.dylib                     0x0000000104524deb objc_exception_throw + 48

2   CoreFoundation                      0x0000000104e3d48d -[NSObject(NSObject) doesNotRecognizeSelector:] + 205

3   CoreFoundation                      0x0000000104d8a90a ___forwarding___ + 970

4   CoreFoundation                      0x0000000104d8a4b8 _CF_forwarding_prep_0 + 120

5   GIFShow                             0x00000001009cd690 __41-[FirstTableViewController getDataSource]_block_invoke + 416

6   GIFShow                             0x0000000100a21b68 __64-[AFHTTPRequestOperation setCompletionBlockWithSuccess:failure:]_block_invoke49 + 40

7   libdispatch.dylib                   0x00000001058f5e5d _dispatch_call_block_and_release + 12

8   libdispatch.dylib                   0x000000010591649b _dispatch_client_callout + 8

9   libdispatch.dylib                   0x00000001058fe2af _dispatch_main_queue_callback_4CF + 1738

10  CoreFoundation                      0x0000000104d94d09 __CFRUNLOOP_IS_SERVICING_THE_MAIN_DISPATCH_QUEUE__ + 9

11  CoreFoundation                      0x0000000104d562c9 __CFRunLoopRun + 2073

12  CoreFoundation                      0x0000000104d55828 CFRunLoopRunSpecific + 488

13  GraphicsServices                    0x0000000106a55ad2 GSEventRunModal + 161

14  UIKit                               0x00000001024fd610 UIApplicationMain + 171

15  GIFShow                             0x00000001009dfe8f main + 111

16  libdyld.dylib                       0x000000010594a92d start + 1

)

libc++abi.dylib: terminating with uncaught exception of type NSException

(lldb) 

出错原因：

解决办法：