您需要添加 UIRequiredDeviceCapabilities 键的info.plist 文件，并设置还是相机值。
这里是所有可能的iDevice要求的表格。

You need to add UIRequiredDeviceCapabilities key to info.plist file and set still-camera value. Here is a table of all possible iDevice requirements.

至于目标IOS版本和一个后台无疑是正确的设置部署目标至少为4.0。

As for target iOS version and backgrounding it's right to set deployment target at least 4.0.