iOS7：让用户能够在拍照和进入图片库之间进行选择的最佳方法是什么？

Question

When a user clicks a certain button,I want him to have the ability to choose between taking a picture and choosing a picture from a gallery. As of right now it seems to be one or the other. Should I create two buttons for this or is there a better what to accomplish this? I am hoping a way to click a button and iOS will natively give the user the choice.

   -(IBAction)takePhoto:(id)sender

   {
UIImagePickerController *imagePickerController = [[UIImagePickerController alloc] init];

if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera])
{
    imagePickerController = [[UIImagePickerController alloc] init];
     imagePickerController.delegate = self;
    imagePickerController.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
}

// image picker needs a delegate,
[imagePickerController setDelegate:self];

// Place image picker on the screen
[self presentModalViewController:imagePickerController animated:YES];
 }

Answer 1

In my opinion the best way would be to Create for example 2 buttons

• UIBarButtonItem * choosePhotoBtn
• UIBarButtonItem * TakePhotoBtn

Then call the same IBAction when pressing either button, and put a condition in it to call the appropriate interface somehting like this:

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

    if((UIBarButtonItem *) sender == choosePhotoBtn) {
        picker.sourceType = UIImagePickerControllerSourceTypeSavedPhotosAlbum;
    } else {
        picker.sourceType = UIImagePickerControllerSourceTypeCamera;
    }
    [self presentViewController:picker animated:YES completion:nil];
}

---

But these are the best options, I like the UIAlertView the most to be honest

To be honest thats more clicks for the user, but again thats my opinion . Here's how you can do it, Create your UIAlertView , then put a condition in its deleguate method:

-(void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex{
    NSString *BtnSelected = [alertView buttonTitleAtIndex:buttonIndex];

    if([BtnSelected isEqualToString:@"choosePhotoBtn"] {
        picker.sourceType = UIImagePickerControllerSourceTypeSavedPhotosAlbum;
    } else {
        picker.sourceType = UIImagePickerControllerSourceTypeCamera;
    }
    [self presentViewController:picker animated:YES completion:nil];

}

Answer 2

When user press the button you can display UIAlertView or UIActionSheet, I would recommended UIAlertView for two button. And in the delegate method base on user selection you can make your logic to access camera or gallery.

Answer 3

There are two options -

1. First show the pickerController with source type as photo library. Then there is a property in UIImagePickerController called cameraOverlayView. You can set it to a custom view with the button at the bottom that on click switches the pickerController source type to camera.

2. Read the photo library and present them for selection in a custom view with a button to launch camera which would use the UIImagePickerController with sourceType as camera.

More about overlayView - [UIImagePickerController cameraOverlayView]

Sample code project from Apple - Using UIImagePickerController to Select Pictures and Take Photos