Question

I wonder, how could I display UIProgressView in this case:
I do photo with UIImagePickerController then in method - (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
I save the picture to UIImage object (outputImage) and hide controller, and when modalView/controller with camera is disappeared I have such code:

        NSLog(@"Image is width: %f height: %f", outputImage.size.width, outputImage.size.height);

        //FLIP PICTURE FROM FACETIME CAMERA
        if((outputImage.size.width == 480 && outputImage.size.height == 640) || (outputImage.size.width == 640 && outputImage.size.height == 480)) {
            outputImage = [UIImage imageWithCGImage:outputImage.CGImage
                                        scale:1.0 orientation: UIImageOrientationLeftMirrored];}

        //RESIZE TO 1000x1000
        outputImage = [self scaleAndCropToSize:outputImage toSize:CGSizeMake(1000, 1000)];

        NSLog(@"Now image is width: %f height: %f", outputImage.size.width, outputImage.size.height);

        //CUTING OUT TO MASK
        outputImage = [self maskImage:outputImage withMask:[UIImage imageNamed:@"mask.png"]];

        //ADDING SHADOW
        CGSize size = CGSizeMake(1000, 1000);
        UIGraphicsBeginImageContext(size);

        CGPoint thumbPoint = CGPointMake(0, 0);
        [outputImage drawAtPoint:thumbPoint];

        UIImage* shadow = [UIImage imageNamed:@"shadow.png"];

        CGPoint starredPoint = CGPointMake(0, 0);
        [shadow drawAtPoint:starredPoint];

        UIImage* result = UIGraphicsGetImageFromCurrentImageContext();
        UIGraphicsEndImageContext();
        outputImage = result;

        //ADDING TO UIIMAGEVIEW (PREVIEW)
        preview.image = outputImage;

While photo is being put into UIImageView, it takes some time. In this time I’d like to display progress view. How can I do that?

EDIT: I thought to place above code in some method and then somehow implement progressview, that would base on method completion time. But dunno.

Answer 1

You can not use UIProgressView as its difficult to know how much time it will take to perform image operations.

you can try this MBProgressHUD

Put this code in didFinishPickingMediaWithInfo

MBProgressHUD *HUD = [[MBProgressHUD alloc] initWithView:self.view];

HUD.labelText = @"Saving Image...";

[self.view  addSubview:HUD];

HUD.delegate = self;

[HUD showWhileExecuting:@selector(savingPicture:) onTarget:self withObject:selectedImage animated:YES];

and put your resize/crop image operations code in savingPicture method.