ios - 获取嵌套在 UIScrollView 中的 UIImageView 中两个 CGPoints 之间的距离

Question

CGRect screenSize = [[UIScreen mainScreen]bounds];
CGFloat screenWidth = screenSize.size.width;
CGRect visibleRect;
    visibleRect.origin = scrollView.contentOffset;
    visibleRect.size = imageView.frame.size;
    CGPoint midPoint = CGPointMake(visibleRect.origin.x + visibleRect.size.width / 2, visibleRect.origin.y + visibleRect.size.height / 2);
CGPoint place = CGPointMake(class.xValue, class.yValue);

xValue 和 yValue 在类中声明为“int”。

-(int)distanceFrom:(CGPoint)point1 to:(CGPoint)point2{
CGFloat xDist = ((point2.x) - (point1.x));
CGFloat yDist = ((point2.y) - (point1.y));
return (sqrt((xDist * xDist) + (yDist * yDist)));
}

问题是，一旦我通过在应用程序中滚动来更改 zoomScale 并调用该方法，数字就会急剧变化（约 1000 像素）。如何考虑缩放比例？提前致谢， 亚历克斯

Answer 1

放大时，距离方法的结果乘以zoomScale滚动视图。如果您想获得实际距离，请尝试将距离除以zoomScale滚动视图。