iOS App提交流程问题

1.An App ID with Identifier '' is not available. Please enter a different string

最近App上架，Xcode之前已经更新到7.3，在注册App ID 时总是无法注册，出现如上提示。无论怎么更改identifier都无法改变，后来在stackoverflow上找到相关答案：

The Application ID Name should be same as application bundle identifier, if you application bundle identifier is com.abc.xyz than the application ID name for this bundle ID should be XC com abc xyz 

A name in any other format won't be seen by Xcode. If you your application is already on app store and you are submitting update than just change the app ID name accourding to above formate and it will work

写成如下格式就行：

2.image can't contain alpha channels or transparencies。图像不能包含alpha通道和透明度

将PNG图片用预览打开导出一下生成JPEG格式的图片，然后再上传就可以了。

3.PNG crush

可能不是PNG文件，也可以将PNG直接重新导出为JPEG文件或者设置alpha为0