pinch to zoom using uiscrollview

问题

I am trying to do a pinch to zoom with a uiscrollview that only has a backgroudnd image. First of all is this possible? Secondly can I do this with interface builder?

Basicly all I have atm is this

    - (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.

    scrollView = [[UIScrollView alloc] initWithFrame:[[UIScreen mainScreen] applicationFrame]];
    scrollView.backgroundColor = [UIColor blackColor];
    scrollView.delegate = self;
    scrollView.bounces = NO;
    scrollView.backgroundColor = [UIColor colorWithPatternImage:[UIImage imageNamed:@"auckland-300.jpg"]];
    UIImageView *image = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"249a-134206f1d00-1342071f5d9.ImgPlayerAUCKLAND.png"]];
    scrollView.contentSize = image.frame.size;
    [scrollView addSubview:image];
    scrollView.minimumZoomScale = scrollView.frame.size.width / image.frame.size.width;
    scrollView.maximumZoomScale = 2.0;
    [scrollView setZoomScale:scrollView.minimumZoomScale];
    self.view = scrollView;

}

Any help would be appreciated

回答1:

You need to implement the UIScrollViewDelegate method.

- (UIView *)viewForZoomingInScrollView:(UIScrollView *)scrollView;

and have it return a reference to your image view. This means you might want to manage a reference to the UIImageView stored within the scroll view.

Oh, and yes, it is doable in Interface Builder.

回答2:

Check out my demo application here:http://rexstjohn.com/facebook-like-ios-photo-modal-gallery-swipe-gestures/.

It demonstrates pinch to zoom of photos in a scrollview as well as a few other common functions you might want. Enjoy.

来源：https://stackoverflow.com/questions/8440586/pinch-to-zoom-using-uiscrollview

标签

iphone

ios

uiscrollview