Swift 图片下拉放大

概述let iconMargin: CGFloat = 10.0let iconW: CGFloat = 80.0let iconH: CGFloat = 80.0let cellIdientifier = "cellIdentifier"let screenHeight = UIScreen.mainScreen().bounds.size.heightlet screenWidth =

let iconmargin: CGfloat = 10.0let iconW: CGfloat = 80.0let iconH: CGfloat = 80.0let cellIDIEntifIEr = "cellIDentifIEr"let screenHeight = UIScreen.mainScreen().bounds.size.heightlet screenWIDth = UIScreen.mainScreen().bounds.size.wIDth

在vIEwDIDLoad中

// 这里创建tablevIEw的代码就不贴出来了        self.createSubvIEws()         // 调整tablevIEw的位置        self.tableVIEw.contentInset = UIEdgeInsetsMake(200,0,0);        // 把图片设置到对应位置上        imagetopVIEw = UIImageVIEw.init(frame: CGRectMake(0,screenWIDth,200))        // 把加载的图片设置需要的大小        let oldImage = UIImage.init(named: "1111")        imagetopVIEw.image = self.originImagescaletoSize(oldImage!,size: CGSizeMake(screenWIDth,200))        // 这里是为了让图片宽度随着高度的拉伸而拉伸        imagetopVIEw.contentMode = UIVIEwContentMode.ScaleAspectFill;        self.vIEw.addSubvIEw(imagetopVIEw)        imageIcon = UIImageVIEw.init(frame: CGRectMake(iconmargin,200 - (iconmargin + iconH),iconW,iconH))        imageIcon.layer.cornerRadius = 7.5;        imageIcon.image = UIImage.init(named: "01")        imageIcon.clipsToBounds = true;        //自动布局，自适应顶部        imageIcon.autoresizingMask = UIVIEwautoresizing.Flexibletopmargin        imagetopVIEw.addSubvIEw(imageIcon)

设置图片的大小

func originImagescaletoSize(image: UIImage,size: CGSize)->UIImage    {        UIGraphicsBeginImageContextWithOptions(size,false,0)        image.drawInRect(CGRectMake(0,size.wIDth,size.height))        let scaleImage: UIImage = UIGraphicsGetimageFromCurrentimageContext()        UIGraphicsEndImageContext()        return scaleImage    }

监听滚动

func scrollVIEwDIDScroll(scrollVIEw: UIScrollVIEw) {        // 偏移量y的变化        let y: CGfloat = scrollVIEw.contentOffset.y;        print("y ------ \(y)")        if y < -200 {            var frame: CGRect = self.imagetopVIEw.frame;            frame.size.height = -y;            self.imagetopVIEw.frame = frame;        }    }

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