Figured it out. I had to add the delegate declaration and remove the - (void)zoomToRect:(CGRect)rect animated:(BOOL)animated. Here's the answer in case anyone needs it:
ImageScrollView.h
#import <UIKit/UIKit.h>
@interface ImageScrollView : UIScrollView <UIScrollViewDelegate>
@property (nonatomic, strong) UIImageView *imageView;
- (id)initWithFrame:(CGRect)frame andImage:(UIImage *)image;
@end
ImageScrollView.m
#import "ImageScrollView.h"
@interface ImageScrollView()
@property CGFloat scaleWidth;
@property CGFloat scaleHeight;
@end
@implementation ImageScrollView
- (id)initWithFrame:(CGRect)frame
{
self = [super initWithFrame:frame];
if (self) {
// Initialization code
}
return self;
}
- (id)initWithFrame:(CGRect)frame andImage:(UIImage *)image
{
self = [super init];
if(self)
{
self.frame = frame;
self.delegate = self;
self.imageView = [[UIImageView alloc]initWithImage:image];
[self addSubview:self.imageView];
self.contentSize = self.imageView.bounds.size;
self.scaleWidth = self.frame.size.width / image.size.width;
self.scaleHeight = self.frame.size.height / image.size.height;
CGFloat minScale = MIN(self.scaleWidth, self.scaleHeight);
self.maximumZoomScale = 1.0f;
self.minimumZoomScale = minScale;
[self setZoomScale:minScale];
}
return self;
}
- (UIView *)viewForZoomingInScrollView:(UIScrollView *)scrollView
{
return self.imageView;
}