UIScrollView里面的UIImageView太远了

Question

我有一个问题,我在UIScrollView中有一个UIImageView.在Interface Builder中,UIScrollView占用整个屏幕,UIImageView占用整个UIScrollView.问题是,当我有一个横向导向的图像时,我将它设置为纵横比较,所以我在顶部和底部有灰色条纹(这就是我想要的).然而,当我放大照片时,一旦照片变焦到足以适合屏幕垂直,我希望它不会平移到它上面的灰色区域.查看我附上的屏幕截图.我基本上希望它在这方面像照片应用程序一样工作.这是我设置UIScrollView和UIImageView的代码:

- (void)viewDidLoad
{
   [super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
   self.imageView.image = [UIImage imageNamed:@"IMG_0300.JPG"];
   self.imageView.contentMode = UIViewContentModeScaleAspectFit;
   self.scrollView.clipsToBounds = YES;
   self.scrollView.contentSize = self.imageView.bounds.size;
   self.scrollView.zoomScale = 1.0;
   self.scrollView.maximumZoomScale = 5.0;
   self.scrollView.minimumZoomScale = 1.0;

}

-(void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}

-(UIView *)viewForZoomingInScrollView:(UIScrollView *)scrollView
{
   return self.imageView; 
}

提前致谢.

雅各

Answer 1

它是你的整个UIImageView缩放,不仅是它的图像,还有灰色条纹.你的scrollView就是老老实实地反映了这一点.你想要的结果可能是这样的:

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
    UIImage *image = [UIImage imageNamed:@"IMG_0300.JPG"];
    CGFloat ratio = CGRectGetWidth(self.scrollView.bounds) / image.size.width;
    self.imageView.bounds = CGRectMake(0, 0, CGRectGetWidth(self.scrollView.bounds), image.size.height * ratio);
    self.imageView.center = CGPointMake(CGRectGetMidX(self.scrollView.bounds), CGRectGetMidY(self.scrollView.bounds));
    self.imageView.image = image;
    self.scrollView.clipsToBounds = YES;
    self.scrollView.contentSize = self.imageView.bounds.size;
    self.scrollView.zoomScale = 1.0;
    self.scrollView.maximumZoomScale = 10.0;
    self.scrollView.minimumZoomScale = 1.0;

}

- (void)scrollViewDidZoom:(UIScrollView *)scrollView
{
    UIView *subView = self.imageView;
    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);
}

-(UIView *)viewForZoomingInScrollView:(UIScrollView *)scrollView
{
    return self.imageView;
}