iPhone: CATiledLayer/UIScrollView wont scroll after zooming and only zooms to anchor point
- by Brodie4598
Here is the problem... I am using CA Tiled Layer to display a large jpg. The view loads okay, and when I go to scroll around, it works fine. However, as soon as I zoom in or out once, it scrolls to the top left (to the anchor point) and will not scroll at all. The zooming works fine, but I just cannot scroll.
Here is my code:
#import <QuartzCore/QuartzCore.h>
#import "PracticeViewController.h"
@implementation practiceViewController
//@synthesize image;
- (void)viewDidLoad
{
NSString *path = [[NSBundle mainBundle] pathForResource:@"H-5" ofType:@"jpg"];
NSData *data = [NSData dataWithContentsOfFile:path];
image = [UIImage imageWithData:data];
CGRect pageRect = CGRectMake(0, 0, image.size.width, image.size.height);
CATiledLayer *tiledLayer = [CATiledLayer layer];
tiledLayer.anchorPoint = CGPointMake(0.0f, 1.0f);
tiledLayer.delegate = self;
tiledLayer.tileSize = CGSizeMake(1000, 1000);
tiledLayer.levelsOfDetail = 6;
tiledLayer.levelsOfDetailBias = 0;
tiledLayer.bounds = pageRect;
tiledLayer.transform = CATransform3DMakeScale(1.0f, -1.0f, 0.3f);
myContentView = [[UIView alloc] initWithFrame:self.view.bounds];
[myContentView.layer addSublayer:tiledLayer];
UIScrollView *scrollView = [[UIScrollView alloc] initWithFrame:self.view.bounds];
scrollView.delegate = self;
scrollView.contentSize = pageRect.size;
scrollView.minimumZoomScale = .2;
scrollView.maximumZoomScale = 1;
[scrollView addSubview:myContentView];
[self.view addSubview:scrollView];
}
- (UIView *)viewForZoomingInScrollView:(UIScrollView *)scrollView
{
return myContentView;
}
- (void)drawLayer:(CALayer *)layer inContext:(CGContextRef)ctx
{
NSString *path = [[NSBundle mainBundle] pathForResource:@"H-5" ofType:@"jpg"];
NSData *data = [NSData dataWithContentsOfFile:path];
image = [UIImage imageWithData:data];
CGRect imageRect = CGRectMake (0.0, 0.0, image.size.width, image.size.height);
CGContextDrawImage (ctx, imageRect, [image CGImage]);
}
@end
