Question

我在UIScrollview中有一个UIImageView。我使用了Apple的docs中的说明。

我设置了最小和最大缩放比例。（0.5和6.0）。我把代表设置为自己。

我在viewForZoomingInScrollView中返回了图像视图。但是我不知道在scrollViewDidEndZooming中要做什么。

我的结果是抖动变焦并且不一致。它只是不像照片库应用程序。

我错过了什么吗？

Answer 1

//create imageview with pinchGesture

        CGRect myImageRect = CGRectMake(17, 95, 285, 130);
        myImage = [[UIImageView alloc] initWithFrame:myImageRect];
        [myImage setImage:[UIImage imageNamed:picture]];
        myImage.userInteractionEnabled = YES;
        UIPinchGestureRecognizer *pgr = [[UIPinchGestureRecognizer alloc]
                                         initWithTarget:self action:@selector(handlePinch:)];
        pgr.delegate = self;
        [myImage addGestureRecognizer:pgr];
        [scrollview addSubview:myImage];

// handlepinch：method

- (IBAction)handlePinch:(UIPinchGestureRecognizer *)recognizer
{
 recognizer.view.transform = CGAffineTransformScale(recognizer.view.transform,   recognizer.scale, recognizer.scale);
recognizer.scale = 1;
}

在此之前添加.h文件

希望它对你有用......

Answer 2

将ImageView缩放内容模式设置为UIViewContentModeCenter，并在加载时缩小（如果需要）。通过执行以下操作，准备好图像后设置起始缩放比例：

        //Min scale is how much ever it takes to fit the image in the view
        CGRect scrollViewFrame = self.scrollView.frame;
        CGFloat scaleWidth = scrollViewFrame.size.width / self.imageView.image.size.width;
        CGFloat scaleHeight = scrollViewFrame.size.height / self.imageView.image.size.height;
        CGFloat minScale = MIN(scaleWidth, scaleHeight);
        self.scrollView.minimumZoomScale = minScale;
        self.scrollView.zoomScale = minScale;

Answer 3

这是我发现完美无瑕的唯一解决方案。它包括双击和两个手指手势放大和缩小。 http://www.raywenderlich.com/10518/how-to-use-uiscrollview-to-scroll-and-zoom-content

UIScrollView中的UIImageView，缩放是紧张不安的

3 个答案: