我只想在iPhone SDK的uiscrollview上实现放大功能，是否可以做到这一点?

问题描述

我只想在iphone sdk的uiscrollview上实现放大功能.是否可以做到这一点?

I would like to implement only zoom in feature on uiscrollview in iphone sdk.Is it possible to do this?

我正在使用以下代码

{
scrollView = [[UIScrollView alloc] initWithFrame:CGRectMake(0, 0, 700, 510)];
   scrollView.delegate = self;
   scrollView.ScrollEnabled=YES;
   scrollView.contentSize = CGSizeMake(700, 510);
   scrollView.userInteractionEnabled = FALSE;
   scrollView.clipsToBounds = YES;
   scrollView.minimumZoomScale = 1;
   scrollView.maximumZoomScale = 2;
   [scrollView addSubview:portrateSlideImage];
   [portSlideContainer addSubview:scrollView];

}

并使用uiscrollview delagte

And using uiscrollview delagte

-(UIView *) viewForZoomingInScrollView:(UIScrollView *)scrollView {
    return portrateSlideImage;
}

推荐答案

尝试一下.可能对您有帮助.

Try this. May be this would help you.

从要设置滚动视图最大比例的代码中删除该行

Remove the line from the code where you are setting maximum scale of scroll view

{
   scrollView = [[UIScrollView alloc] initWithFrame:CGRectMake(0, 0, 700, 510)];
   scrollView.delegate = self;
   scrollView.ScrollEnabled=YES;
   scrollView.contentSize = CGSizeMake(700, 510);
   scrollView.userInteractionEnabled = TRUE;         //edited again
   scrollView.clipsToBounds = YES;
   scrollView.minimumZoomScale = 1;
   scrollView.maximumZoomScale = 2;                  //edited again
   [scrollView addSubview:portrateSlideImage];
   [portSlideContainer addSubview:scrollView];
}

并添加此功能

- (void)scrollViewDidEndZooming:(UIScrollView *)scrollView withView:(UIView *)view atScale:(float)scale
{
   scrollView.minimumZoomScale = scale;
}

不允许您使用zoom out.只需放大

It won't allow you to zoom out . Just zoom in

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