UIImagePickerController 相机无法快速工作

问题描述

我有一个动作表，它有两个选项:一个是您可以从库中选择图像，另一个是您可以从相机拍摄照片.照片库正常运行，但我似乎无法让相机工作.

I have an action sheet that has two options: one where you can choose an image from your library and one where you can take a photo from the camera. The photo library functions properly, but I can't seem to get the camera to work.

这是我的代码:

let takePhoto = UIAlertAction(title: "Take photo", style: .Default,   handler: {
    (alert: UIAlertAction!) -> Void in
    // present camera taker
    var cameraPicker = UIImagePickerController()
    cameraPicker.delegate = self
    cameraPicker.sourceType = .Camera
    self.presentViewController(cameraPicker, animated: true, completion: nil)
})

func imagePickerController(picker: UIImagePickerController, didFinishPickingImage image: UIImage!, editingInfo: [NSObject : AnyObject]!) {
    var selectedAvatar = UIImagePickerControllerOriginalImage
    self.dismissViewControllerAnimated(false, completion: nil)
}

我似乎找不到问题，有人可以帮我吗?当我尝试运行该程序并单击拍照"时，该程序崩溃了.

I can't seem to find the problem, can anybody help me out? The program crashes when I try to run it and click on Take Photo.

推荐答案

您很可能在模拟器中运行.模拟器没有摄像头，因此在按下按钮时不会使应用程序崩溃，您必须检查 cemera 是否可用.

You are most likely running in the simulator. The simulator dont have a camera so to not make the app crash when pressing the button you have to check if cemera is available.

if UIImagePickerController.isSourceTypeAvailable(.Camera) {
    ...
}
else {
    print("Sorry cant take picture")
}

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