取出手机上crash log
手机连上itunes同步后，log在mac这个目录下~/Library/Logs/CrashReporter/MobileDevice/;
找到电脑上symbolicatecrash位置
输入：
find /Applications/Xcode.app -name symbolicatecrash -type f
你会找到：
/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/Library/PrivateFrameworks/DTDeviceKitBase.framework/Versions/A/Resources/./symbolicatecrash
用命令将symbolicatecrash拷贝到桌面的crash文件夹里面，与.app和.app.dSYM放一起
cp /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/Library/PrivateFrameworks/DTDeviceKitBase.framework/Versions/A/Resources/symbolicatecrash /Users/angel/Desktop/crash
反编译crash文件
打开终端用命令切换到桌面的crash目录下：
cd /Users/你的电脑名称/Desktop/crash
执行命令:
./symbolicatecrash /Users/angelseahappiness/Desktop/crash/Control_2014-01-13-111838_Lynns-iPad3.crash /Users/angel/Desktop/crash/Control.app.dSYM > Control_symbol.crash
这时候终端如果出现：Error: "DEVELOPER_DIR" is not defined at ./symbolicatecrash line 60, 输入命令：
export DEVELOPER_DIR="/Applications/XCode.app/Contents/Developer"
再执行:
./symbolicatecrash /Users/angelseahappiness/Desktop/crash/Control_2014-01-13-111838_Lynns-iPad3.crash /Users/angel/Desktop/crash/Control.app.dSYM > Control_symbol.crash
这时候终端将会进行处理了, 将终端完成以后，在crash文件夹里面会多出一个文件Control_symbol.crash：这个就是最终的文件，可以查看bug!