Question

我需要使用UIPinchGestureRecognizer缩放视图但不使用CGAffineTransform，那么如何在没有CGAffineTransform的情况下更改此代码呢？

- (IBAction)zoomma:(UIGestureRecognizer *)sender {

    CGFloat factor = [(UIPinchGestureRecognizer *)sender scale];
    if (factor > 1) {
        self.sgungaView.transform = CGAffineTransformMakeScale(lastScaleFactor + (factor-1), lastScaleFactor + (factor-1));
    } else {
        self.sgungaView.transform = CGAffineTransformMakeScale(lastScaleFactor * factor, lastScaleFactor * factor);
    }

    if (sender.state == UIGestureRecognizerStateEnded) { 
        if (factor > 1) {
            lastScaleFactor += (factor-1); 
        } else {
            lastScaleFactor *= factor;
        }
    }
}

编辑：

不是杰作，但这有效

- (void)zoomma:(UIGestureRecognizer *)sender {

    CGFloat factor = [(UIPinchGestureRecognizer *)sender scale];
    if (factor > 1) {
        float enlarge = lastScaleFactor + (factor-1);
        [self.sgungaView setBounds:CGRectMake(0, 0, self.sgungaView.bounds.size.height + enlarge, self.sgungaView.bounds.size.height + enlarge)];
    } else {
        float stringi = lastScaleFactor * factor;
        [self.sgungaView setBounds:CGRectMake(0, 0, self.sgungaView.bounds.size.height - stringi, self.sgungaView.bounds.size.height - stringi)];
    }

    if (sender.state == UIGestureRecognizerStateEnded) { 
        if (factor > 1) {
            lastScaleFactor += (factor-1); 
        } else {
            lastScaleFactor *= factor;
        }
    }
}

有更好的方法吗？

Answer 1

您可以将UIScrollView添加到视图中，并将您的元素（视图元素）添加到UIScrollView。然后，您可以使用UIScrollView中的zoom delegete进行缩放。

这适合我。

如何在没有CGAffineTransform的情况下缩放视图

1 个答案: