如果你在提交app到appstore的时候遇到如下问题：
Missing recommended icon file - The bundle does not contain an app icon for iPhone / iPod Touch of exactly '120x120' pixels, in .png format for iOS versions >= 7.0.
Missing recommended icon file - The bundle does not contain an app icon for iPad of exactly '76x76' pixels, in .png format for iOS versions >= 7.0.
Missing recommended icon file - The bundle does not contain an app icon for iPad of exactly '152x152' pixels, in .png format for iOS versions >= 7.0.
即便你的项目中已经有相关尺寸的文件，可能还会报错。
这个时候你应该去你的应用程序的目录下去查询是否存在此图片。
/Users/caidd/Library/Developer/Xcode/Archives/2014-12-30/xxx 14-12-30 下午10.14.xcarchive/Products/Applications/xxx.app
必要的时候删掉Archives目录。