突然出現了這樣問題，嚇死我，然后只是把原來編譯好的
app里面所有的東西刪除再編譯就好了。
如果刪除后不行，可以試試后面的截圖所說，反正我是沒有試過的
Starting /Qtwork/build-test1-Desktop_Qt_5_4_2_clang_64bit-Release/test1.app/Contents/MacOS/test1...
objc[17277]: Class NotificationReceiver is implemented in both /Qt5.4.2/5.4/clang_64/lib/QtWidgets.framework/Versions/5/QtWidgets and /Qtwork/build-test1-Desktop_Qt_5_4_2_clang_64bit-Release/test1.app/Contents/Frameworks/QtWidgets.framework/Versions/5/QtWidgets.
One of the two will be used. Which one is undefined.
QObject::moveToThread: Current thread (0x7f9c8160c740) is not the object's thread (0x7f9c81510670).
Cannot move to target thread (0x7f9c8160c740)
You might be loading two sets of Qt binaries into the same process. Check that all plugins are compiled against the right Qt binaries. Export DYLD_PRINT_LIBRARIES=1 and check that only one
set of binaries are being loaded.
This application failed to start because it could not find or load the Qt platform plugin "cocoa".
Available platform plugins are: cocoa.
Reinstalling the application may fix this problem.
程序異常結束。
/Qtwork/build-test1-Desktop_Qt_5_4_2_clang_64bit-Release/test1.app/Contents/MacOS/test1 crashed
http://www.lai18.com/content/1257164.html