objective c - Zooming UIImage in a UIScrollView -

objective c - Zooming UIImage in a UIScrollView -

i have custom class implements uiscrollview.

i created 1 uiimageview , add together subview of uiscrollview. scrolls vertically , horizontally perfectly, seems ignoring zooming stuff. here code:

- (void) setupboard { // add together board uiimageview *imageholder = [[uiimageview alloc] initwithimage:[uiimage imagenamed:@"grid.jpg"]]; [self addsubview:imageholder]; self.contentsize = cgsizemake(imageholder.frame.size.width, imageholder.frame.size.height); self.indicatorstyle = uiscrollviewindicatorstylewhite; self.maximumzoomscale = 5.0; self.minimumzoomscale = 0.2; self.zoomscale = 0.7; self.clipstobounds = yes; }

how zoom using standard pinch gestures? help appreciated. thanks!

from uiscrollview class reference overview:

the uiscrollview class can have delegate must adopt uiscrollviewdelegate protocol. zooming , panning work, delegate must implement both viewforzoominginscrollview: , scrollviewdidendzooming:withview:atscale:; in addition, maximum (maximumzoomscale) , minimum (minimumzoomscale) zoom scale must different.

i suspect either haven't assigned delegate scroll view, or delegate doesn't implement both of methods.

objective-c uiscrollview