我是iphone开发的新手。我想缩放图像视图,我使用以下代码,
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
self.scrollViewOutlet.minimumZoomScale=0.5;
self.scrollViewOutlet.maximumZoomScale=4.0;
self.scrollViewOutlet.contentSize=self.imagetobeZoomed.image.size;
self.scrollViewOutlet.clipsToBounds=YES;
self.scrollViewOutlet.delegate=self;
}
-(UIView *)viewForZoomingInScrollView:(UIScrollView *)scrollView{
return self.imagetobeZoomed;
}
通过使用上面的代码,我可以缩放图像,但我的问题是我的图像在缩放时运行到左下角。那就是我无法将我的图像位置固定在屏幕中央。
我希望图像位置在缩放时保持固定。对此有何帮助?
答案 0 :(得分:6)
最后我找到了一个自己的解决方案。这里是图像缩放的完整代码示例:)这里图像位置在放大和缩小时保持固定。
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
self.scrollViewOutlet.minimumZoomScale=0.5;
self.scrollViewOutlet.maximumZoomScale=4.0;
self.scrollViewOutlet.contentSize=CGSizeMake(self.imagetobeZoomed.frame.size.width, self.imagetobeZoomed.frame.size.height);
self.scrollViewOutlet.clipsToBounds=YES;
self.scrollViewOutlet.delegate=self;
}
-(UIView *)viewForZoomingInScrollView:(UIScrollView *)scrollView
{
return self.imagetobeZoomed;
}
-(void)scrollViewDidZoom:(UIScrollView *)scrollView
{
UIView *subView=[scrollView.subviews objectAtIndex:0];
CGFloat offsetX = (scrollView.bounds.size.width > scrollView.contentSize.width)?
(scrollView.bounds.size.width - scrollView.contentSize.width) * 0.5 : 0.0;
CGFloat offsetY = (scrollView.bounds.size.height > scrollView.contentSize.height)?
(scrollView.bounds.size.height - scrollView.contentSize.height) * 0.5 : 0.0;
subView.center = CGPointMake(scrollView.contentSize.width * 0.5 + offsetX,
scrollView.contentSize.height * 0.5 + offsetY);
}
答案 1 :(得分:1)
试试NYOBetterZoom。这肯定是你的答案。 :)