UIScrollView限制在1倍到2倍之间捏合放大缩小

最新推荐文章于 2018-03-27 19:34:16 发布

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最新推荐文章于 2018-03-27 19:34:16 发布

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分类专栏： iphone UIScrollView捏合放大缩小文章标签： uiview image

本文链接：https://blog.youkuaiyun.com/nogodoss/article/details/7164872

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UIScrollView捏合放大缩小

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本文展示了如何使用Swift或Objective-C设置UIScrollView，限制其在1倍到2倍之间进行捏合放大和缩小操作。代码示例中创建了一个UIView，并在其中添加了UIScrollView，设置最小和最大缩放比例，同时包含了UIImageView来展示可缩放的图片。

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直接贴代码，注释些清楚拉

UIView* wholeview = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 1024,768)];
    [wholeview setBackgroundColor:[UIColor clearColor]];

    NSString *imagePath = [[NSBundle mainBundle] pathForResource:@"bk" ofType:@"png"];
    UIImage *image = [UIImage imageWithContentsOfFile:imagePath];

    UIScrollView* mybkScrollView = [[UIScrollView alloc] initWithFrame:wholeview.bounds];
    mybkScrollView.minimumZoomScale = 1.0;   //最小倍数
    mybkScrollView.maximumZoomScale = 2.0; //最大倍数
    mybkScrollView.contentSize = CGSizeMake(image.size.width,image.size.height); //两倍大小图片
    mybkScrollView.delegate = self;
    mybkScrollView.decelerationRate = 1.0f; //减速速率

    mybkScrollView.autoresizingMask = UIViewAutoresizingFlexibleLeftMargin|UIViewAutoresizingFlexibleTopMargin|UIViewAutoresizingFlexibleHeight|UIViewAutoresizingFlexibleWidth;

    //放大缩小的图片
    UIImageView *imageView = [[UIImageView alloc] initWithFrame:mybkScrollView.bounds];
    imageView.autoresizingMask = UIViewAutoresizingFlexibleLeftMargin|UIViewAutoresizingFlexibleTopMargin|UIViewAutoresizingFlexibleHeight|UIViewAutoresizingFlexibleWidth;
    imageView.image = image;
    [mybkScrollView addSubview:imageView];
    [imageView release];

    [wholeview addSubview:mybkScrollView];
    [mybkScrollView release];

    [self.view addSubview:wholeview];
    [wholeview release];

    mybkScrollView.zoomScale = 1.0; 初始时的大小。不然初始拖动会显示底色的