问题
I am making a Universal iOS Application which needs to access the camera and the camera roll. How would i go about this? I have no code to show yet because the app is mainly based around this.
回答1:
This answer relevant on physical device ONLY!
Access Camera:
- (void)takePhoto {
UIImagePickerController *picker = [[UIImagePickerController alloc] init];
picker.delegate = self;
picker.allowsEditing = YES;
picker.sourceType = UIImagePickerControllerSourceTypeCamera;
[self presentViewController:picker animated:YES completion:NULL];
}
Access Camera Roll:
- (void)selectPhoto {
UIImagePickerController *picker = [[UIImagePickerController alloc] init];
picker.delegate = self;
picker.allowsEditing = YES;
picker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
[self presentViewController:picker animated:YES completion:NULL];
}
Implementing the Delegate Methods of UIImagePickerController:
- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info {
UIImage *chosenImage = info[UIImagePickerControllerEditedImage];
self.imageView.image = chosenImage;
[picker dismissViewControllerAnimated:YES completion:NULL];
}
And This:
- (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker {
[picker dismissViewControllerAnimated:YES completion:NULL];
}
Source code here
回答2:
You need to declare delegate UIImagePickerControllerDelegate in .h file
and use this code to open camera.
// Pick image from camera
- (IBAction)captureImage:(id)sender
{
if (! [UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera]) {
UIAlertView *deviceNotFoundAlert = [[UIAlertView alloc] initWithTitle:@"No Device" message:@"Camera is not available"
delegate:nil
cancelButtonTitle:@"Okay"
otherButtonTitles:nil];
[deviceNotFoundAlert show];
} else {
UIImagePickerController *cameraPicker = [[UIImagePickerController alloc] init];
cameraPicker.sourceType = UIImagePickerControllerSourceTypeCamera;
cameraPicker.delegate =self;
// Show image picker
[self presentViewController:cameraPicker animated:YES completion:nil];
}
}
回答3:
What you are looking for is probably this.
Here is the UIImagePickerController Class Reference:
https://developer.apple.com/library/ios/documentation/uikit/reference/UIImagePickerController_Class/UIImagePickerController/UIImagePickerController.html
Here is overall camera programming and a useful document for you.
https://developer.apple.com/library/ios/documentation/AudioVideo/Conceptual/CameraAndPhotoLib_TopicsForIOS/Articles/PickinganItemfromthePhotoLibrary.html
Good Luck!
来源：https://stackoverflow.com/questions/20991749/how-to-access-camera-camera-roll-objective-c