在 iPhone 模拟器上使用 UIImagePickerController

Question

我有一种方法，可以从图库或相机中拍摄照片，

-(IBAction) getPhoto:(id) sender {
  UIImagePickerController * picker = [[UIImagePickerController alloc] init];
  picker.delegate = self;

  if((UIButton *) sender == choosePhotoBtn) {
        picker.sourceType = UIImagePickerControllerSourceTypeSavedPhotosAlbum;
  } else {
        picker.sourceType = UIImagePickerControllerSourceTypeCamera;
  }

  [self presentModalViewController:picker animated:YES];
}

但是当我在模拟器上运行它时，代码不起作用。它在 picker.sourceType = UIImagePickerControllerSourceTypeSavedPhotosAlbum 和 picker.sourceType = UIImagePickerControllerSourceTypeCamera 中不起作用

问题出在模拟器中还是代码中？

Answer 1

，请尝试此操作

 if([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypePhotoLibrary])
        {
            picker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
        }
        else
        {
            picker.sourceType = UIImagePickerControllerSourceTypeSavedPhotosAlbum;
        }
        [self.navigationController presentModalViewController:picker animated:NO];

如果您正在为 iPad 创建应用程序 。您必须在 popOver 控件中显示图库。

Answer 2

Swift 3/4/5 版本：

if UIImagePickerController.isSourceTypeAvailable(.camera) {
    picker.sourceType = .camera
}
else {
    picker.sourceType = .savedPhotosAlbum // or .photoLibrary
}

Swift 2 版本：

if UIImagePickerController.isSourceTypeAvailable(.Camera) {
    picker.sourceType = .Camera
}
else {
    picker.sourceType = .SavedPhotosAlbum // or .PhotoLibrary
}

在模拟器中，您不能使用cameraCaptureMode 和 showsCameraControls。

Answer 3

在模拟器中，您的 picker.sourceType = UIImagePickerControllerSourceTypeCamera 将不会被调用，因为模拟器中没有可用的相机。检查源类型是否可用以避免崩溃也是一个好习惯。

#import <MobileCoreServices/UTCoreTypes.h>
….
 if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera])
        {
            UIImagePickerController *imagePickerCamera =[[UIImagePickerController alloc] init];
            imagePickerCamera.delegate = self;
            imagePickerCamera.mediaTypes = [NSArray arrayWithObjects:(NSString *) kUTTypeImage,nil];
            imagePickerCamera.allowsEditing = YES;
            imagePickerCamera.sourceType = UIImagePickerControllerSourceTypeCamera;

            [self presentViewController:imagePickerCamera  animated:YES completion:nil];
        }

    else if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeSavedPhotosAlbum])
        {
            UIImagePickerController *imagePickerAlbum =[[UIImagePickerController alloc] init];
            imagePickerAlbum.delegate = self;
            imagePickerAlbum.mediaTypes = [NSArray arrayWithObjects:(NSString *) kUTTypeImage,nil];
            imagePickerAlbum.allowsEditing = YES;
            imagePickerAlbum.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;

            [self presentViewController:imagePickerAlbum animated:YES completion:nil];
        }

Answer 4

与上面的答案类似，但我发现这更容易。如果设备没有摄像头（如模拟器），则显示弹出警报。 Sam代码，不同用法：

//button if to take a photo
- (IBAction)takePhoto:(id)sender {

//checks if device has a camera
    if (![UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera]) {
        UIAlertView *noCameraAlert = [[UIAlertView alloc] initWithTitle:@"Error" message:@"You don't have a camera for this device" delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil, nil];

        //shows above alert if there's no camera
        [noCameraAlert show];
    }

    //otherwise, show a modal for taking a photo
    else {
        UIImagePickerController *imagePicker = [[UIImagePickerController alloc] init];
        imagePicker.delegate = self;
        imagePicker.allowsEditing = YES;
        imagePicker.sourceType = UIImagePickerControllerSourceTypeCamera;

        [self presentViewController:imagePicker animated:YES completion:NULL];
    }
}