iOS UI开发之UIScrollView swift版本

概述

• UIScrollView允许滚动和缩放其包含的视图的视图。

属性和方法

初始化方法

let scrollView = UIScrollView.init(frame: CGRect.init(x: 0, y: 0, width: view.bounds.size.width, height: view.bounds.size.height))

设置偏移量

scrollView.contentSize = CGSize.init(width: view.bounds.size.width, height: 1150)

设置视图是否支持滑动到最顶端

scrollView.scrollsToTop = true

设置是否反弹

scrollView.bounces = true

设置是否分页

scrollView.isPagingEnabled = true

        

设置是否可以滚动

scrollView.isScrollEnabled = true

        

设置是否显示滚动条

scrollView.showsVerticalScrollIndicator = true

        

设置滚动条的样式

scrollView.indicatorStyle = .white

代理方法

当视图开始滚动时执行此代理方法

optional public func scrollViewDidScroll(_ scrollView: UIScrollView) // any offset changes

当视图即将开始被拖拽时执行的代理方法

optional public func scrollViewWillBeginDragging(_ scrollView: UIScrollView)

当视图结束拖拽时执行的代理方法

optional public func scrollViewDidEndDragging(_ scrollView: UIScrollView, willDecelerate decelerate: Bool)

当视图减速停止时执行的代理方法

optional public func scrollViewDidEndDecelerating(_ scrollView: UIScrollView) // called when scroll view grinds to a halt

当视图开始减速时执行的代理方法

optional public func scrollViewWillBeginDecelerating(_ scrollView: UIScrollView) // called on finger up as we are moving

是否支持滑动到顶部

optional public func scrollViewShouldScrollToTop(_ scrollView: UIScrollView) -> Bool // return a yes if you want to scroll to the top. if not defined, assumes YES

视图已经放大或缩小

optional public func scrollViewDidZoom(_ scrollView: UIScrollView) // any zoom scale changes

缩放结束时执行的代理方法

optional public func scrollViewDidEndZooming(_ scrollView: UIScrollView, with view: UIView?, atScale scale: CGFloat) // scale between minimum and maximum. called after any 'bounce' animations

视图开始放大或者缩小时执行的代理方法

optional public func scrollViewWillBeginZooming(_ scrollView: UIScrollView, with view: UIView?) // called before the scroll view begins zooming its content