how to zoom in and zoom out an image on clicking button in iphone

I have image in a imageview which is placed in a scrollview., Zoom in and out are performed on pinches,

now, i want to zoom in and out on clicking buttons placed for zoom in开发者_如何转开发 and zoom out.

how to do it? Is there any option? if anyone knows please tell me.

Thanks in advance.

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You can set the zoom scale of the scroll view programatically based on the tap of a button. A simple implementation:

- (IBAction)zoomIn:(id)sender {
    if(scrollView.zoomScale < scrollView.maximumZoomScale) {
        scrollView.zoomScale = (scrollView.zoomScale + 0.1);
    }
}


- (IBAction)zoomOut:(id)sender {
    if(scrollView.zoomScale > scrollView.minimumZoomScale) {
        scrollView.zoomScale = (scrollView.zoomScale - 0.1);
    }
}