slove UIImagePickerController use on ios 7 crashes

Received memory warning 問題

• 在 IOS6 中使用 UIImagePickerController 可正常運行，但在 IOS7 / iPhone 4S 中拍照時，卻出現

2014-03-25 16:45:39.990 CameraTest[3442:60b] Received memory warning.

• 在拍照時，內存使用會較平常高出許多，所以在較低階的設備 ( pad min，iPad2 ) 執行時，有時甚至會導致 app crash

Slove

在 didReceiveMemoryWarning 中將佔用的資源釋放

- (void)didReceiveMemoryWarning
{
    [self.imagePicker dismissViewControllerAnimated:YES completion:^{}];  //釋放 UIImagePickerController
    [super didReceiveMemoryWarning];
}

Snapshotting a view that has not been rendered results... 問題

• IOS7 再調用 UIImagePickerController 時，若 device 為橫向則會出現以下訊息

2014-03-25 16:47:48.824 CameraTest[3442:60b] Snapshotting a view that has not been rendered results in an empty snapshot. Ensure your view has been rendered at least once before snapshotting or snapshot after screen updates.

Slove

• 在 Apple Developer 中，可看到 The UIImagePickerController class supports portrait mode only. 故在橫向時，會出現如上訊息
• 目前尚未找到有效的解決辦法，因為系統在開啟相機時會自動判斷 device 方向，且 device 方向是唯讀不可修改
• 經過測試，上述訊息並不會影響 app 的運行，更不會導致 crash

References

• UIImagePicker crashes on ios7/iphone 4s
• Camera Memory Issues in iOS7
• Best way to operate a UIImagePickerController from a custom UITableViewCell
• UIImagePicker get error: Snapshotting a view that has not been rendered results in an empty snapshot in iOS7

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