Customizable pull-to-refresh control written in pure Swift

SurfingRefreshControl

Customizable pull-to-refresh control,written in pure Swift.

This project is heavily inspired by CBStoreHouseRefreshControl which is Objective-C implemented. SurfingRefreshControl provides you a chance to use pure Swift alternative in your next app.

How to use

Warning:Check out demo app directly if you're too lazy to read

You can attach it to any UIScrollView ( like UITableView UICollectionView) :

class func attachToScrollView(
scrollView:UIScrollView,
target:AnyObject,
refreshAction:Selector,
plist:String,
color:UIColor=UIColor.blackColor(),
lineWidth:CGFloat=2,
dropHeight:CGFloat=80,
scale:CGFloat=1,
horizontalRandomness:Int=150,
reverseLoadingAnimation:Bool=false,
internalAnimationFactor:CGFloat=1.0) -> SurfingRefreshControl

For instance:

self.surfingRefreshControl = SurfingRefreshControl.attachToScrollView(tableView, target: self,refreshAction:#selector(DemoViewController.refreshTriggered), plist: "surfing", color: UIColor.whiteColor(),lineWidth: 1.5, dropHeight: 120, scale: 1.0, horizontalRandomness: 100,  reverseLoadingAnimation: false, internalAnimationFactor: 0.8) 

Implement UIScrollViewDelegate in your UIViewController to notify SurfingRefreshControl your scrollView's movements:

override func scrollViewDidScroll(scrollView: UIScrollView) {
  	self.surfingRefreshControl.scrollViewDidScroll(scrollView)
}

override func scrollViewDidEndDragging(scrollView: UIScrollView, willDecelerate decelerate: Bool) {
	self.surfingRefreshControl.scrollViewDidEndDragging(scrollView, willDecelerate: decelerate)
}

When you're done with surfing,simply call

self.surfingRefreshControl.finishLoading()

How to customize your refresh:

SurfingRefreshControl make use of SurfingBarItem which actually is a UIView subclass, made of start point and end point to form a line.Imagine a squre need 4 line,thus need 4 SurfingBarItem,which equal to 4 start points and 4 end points.In conclusion,a square surfing refresh control would need a plist file of 4 start points and 4 end points,as shown below:

Square SurfingRefreshControl output is:

PaintCode to generate your startpoints and endpoints without too much hassle:

GitHub