Source type 1 not available 錯誤

拿一個擴增實境的範例程式在Xcode，用模擬器跑時，發生下面這個詭異的錯誤：

Terminating app due to uncaught exception ‘NSInvalidArgumentException’, reason: ‘Source type 1 not available’

結果原因是因為有段code：

imagePicker.sourceType = UIImagePickerControllerSourceTypeCamera;

模擬器沒有camera，所以那個sourceType在模擬器執行時assign給它UIImagePickerControllerSourceTypeCamera會發生錯誤。

reference:

https://discussions.apple.com/thread/1720561?start=0&tstart=0

http://zcentric.com/2008/08/28/using-a-uiimagepickercontroller/

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