ios - UIView 的特定部分放大/缩小而不增加 View objective C iOS 的高度/宽度

Question

我实现了这个。但问题是它通过缩放增加了 View 的高度/宽度。如何在不增加高度/宽度的情况下进行缩放。我的 UIView 高度/宽度是固定的。我的基本目标是 View 高度/宽度保持不变但缩放 View 的内侧。

    UIPinchGestureRecognizer * pinGeture =  [[UIPinchGestureRecognizer alloc]initWithTarget:self action:@selector(twoFingerPinch:)];
    [radarViewHolder addGestureRecognizer:pinGeture];



- (void)twoFingerPinch:(UIPinchGestureRecognizer *)recognizer
{
    NSLog(@"Pinch scale: %f", recognizer.scale);

    if([recognizer state] == UIGestureRecognizerStateBegan) {
        // Reset the last scale, necessary if there are multiple objects with different scales
        lastScale = [recognizer scale];
    }

    if ([recognizer state] == UIGestureRecognizerStateBegan ||
        [recognizer state] == UIGestureRecognizerStateChanged) {

        CGFloat currentScale = [[[recognizer view].layer valueForKeyPath:@"transform.scale"] floatValue];

        // Constants to adjust the max/min values of zoom
        const CGFloat kMaxScale = 2.0;
        const CGFloat kMinScale = 1.0;

        CGFloat newScale = 1 -  (lastScale - [recognizer scale]);
        newScale = MIN(newScale, kMaxScale / currentScale);
        newScale = MAX(newScale, kMinScale / currentScale);
        CGAffineTransform transform = CGAffineTransformScale([[recognizer view] transform], newScale, newScale);
        [recognizer view].transform = transform;

        lastScale = [recognizer scale];  // Store the previous scale factor for the next pinch gesture call
    }
}

Answer 1

在 yourScroll 中添加您的 View 作为 subview 。

[yourScroll addSubView:radarViewHolder];


- (void)scrollViewDidZoom:(UIScrollView *)scrollView
{

    CGFloat size = scrollView.zoomScale;
    if (size > ZoomMaxValue)
    {
        yourScroll.zoomScale = maximumScale;
    }
    if (size > ZoomMinValue && size < ZoomValue && size < 1.01)
    {
        yourScroll.zoomScale = minimumScale;
    }
    ZoomValue = size;
}