捏缩放效果在scrollView内的UIImageView上？

Question

我正在使用storyboard(iOS 6.0)为我的应用程序创建照片库查看器.这就是我在storyboard中设置imageViewController的方法:

我已经确保在imageView和scrollView上启用userInteraction和多次触摸.我想要做的是,在捏时我想放大到imageView(最大比例3)并且能够平移.这是我目前所拥有的,然而,即使检测到捏合手势,比例也不会改变.

- (IBAction)imagePinched:(id)sender {

if (pinchRecognizer.state == UIGestureRecognizerStateEnded || pinchRecognizer.state == UIGestureRecognizerStateChanged) {

    NSLog(@"gesture.scale = %f", pinchRecognizer.scale);

    CGFloat currentScale = self.fullScreenView.frame.size.width / self.fullScreenView.bounds.size.width;
    CGFloat newScale = currentScale * pinchRecognizer.scale;

    if (newScale < 1) {
        newScale = 1;
    }
    if (newScale > 3) {
        newScale = 3;
    }

    CGAffineTransform transform = CGAffineTransformMakeScale(newScale, newScale);
        self.fullScreenView.transform = transform;
        pinchRecognizer.scale = 1;
    }

}

大多数在线问题和教程处理以编程方式创建视图并执行此操作,但代码越少越好(在我看来).什么是让它与故事板一起使用的最佳方法？先感谢您!!!

---

更新:

这是我的完整.m文件代码:

- (void)viewDidLoad
{
    [super viewDidLoad];

    //Assign an image to this controller's imageView
    fullScreenView.image = [UIImage imageNamed:imageString];

    //Allows single and double tap to work
    [singleTapRecognizer requireGestureRecognizerToFail: doubleTapRecognizer];
}

- (IBAction)imageTapped:(id)sender {

    NSLog(@"Image Tapped.");

    //On tap, fade out viewController like the twitter.app
    [self dismissViewControllerAnimated:YES completion:nil];
}

- (IBAction)imageDoubleTapped:(id)sender {

    NSLog(@"Image Double Tapped.");

    //On double tap zoom into imageView to fill in the screen.
    [fullScreenView setContentMode:UIViewContentModeScaleAspectFill];
}

- (IBAction)imagePinched:(id)sender {

    if (pinchRecognizer.state == UIGestureRecognizerStateEnded || pinchRecognizer.state == UIGestureRecognizerStateChanged) {

        NSLog(@"gesture.scale = %f", pinchRecognizer.scale);

        CGFloat currentScale = self.fullScreenView.frame.size.width / self.fullScreenView.bounds.size.width;
        CGFloat newScale = currentScale * pinchRecognizer.scale;

        if (newScale < 1) {
            newScale = 1;
        }
        if (newScale > 3) {
            newScale = 3;
        }

        CGAffineTransform transform = CGAffineTransformMakeScale(newScale, newScale);
        self.fullScreenView.transform = transform;
        pinchRecognizer.scale = 1;
    }
}

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


-(void)scrollViewDidEndZooming:(UIScrollView *)scrollView withView:(UIView *)view atScale:(float)scale {

}

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

@end

Answer 1

我认为Apple文档中有更好的解决方案

- (UIView *)viewForZoomingInScrollView:(UIScrollView *)scrollView

{

    return self.imageView;

}
- (void)viewDidLoad {

    [super viewDidLoad];

    self.scrollView.minimumZoomScale=0.5;

    self.scrollView.maximumZoomScale=6.0;

    self.scrollView.contentSize=CGSizeMake(1280, 960);

    self.scrollView.delegate=self;

}

查看Apple文档

Answer 2

Apple 建议您按照以下方式进行操作。我使用了苹果提供的代码，它的效果非常好！如果你想优化内存管理，你可以使用iCarousel（由 nicklockwood 制作），它具有用于释放未使用视图的缓存管理！