LTInfiniteScrollView-Swift: A Swift repository from qq345386817

Demo

1. You can apply animation to each view during the scroll:

2. The iOS 9 task switcher animation can be implemented in ten minutes with the support of this lib:

3. The fancy menu can also be implemented easily:

You can find the full demo in the Objective-C version: https://github.com/ltebean/LTInfiniteScrollView.

Installation

pod 'LTInfiniteScrollViewSwift'

Or just copy LTInfiniteScrollView.swift into your project.

Usage

You can create the scroll view by:

scrollView = LTInfiniteScrollView(frame: CGRect(x: 0, y: 200, width: screenWidth, height: 300))
scrollView.dataSource = self
scrollView.delegate = self
scrollView.maxScrollDistance = 5
scrollView.reloadData(initialIndex: 0)

Then implement LTInfiniteScrollViewDataSource protocol:

public protocol LTInfiniteScrollViewDataSource: class {
    func viewAtIndex(index: Int, reusingView view: UIView?) -> UIView
    func numberOfViews() -> Int
    func numberOfVisibleViews() -> Int
}

Sample code:

func numberOfViews() -> Int {
    return 100
}
    
func numberOfVisibleViews() -> Int {
    return 5
}

func viewAtIndex(index: Int, reusingView view: UIView?) -> UIView {
    if let label = view as? UILabel {
        label.text = "\(index)"
        return label
    }
    else {
        let size = screenWidth / CGFloat(numberOfVisibleViews())
        let label = UILabel(frame: CGRect(x: 0, y: 0, width: size, height: size))
        label.textAlignment = .Center
        label.backgroundColor = UIColor.darkGrayColor()
        label.textColor = UIColor.whiteColor()
        label.layer.cornerRadius = size / 2
        label.layer.masksToBounds = true
        label.text = "\(index)"
        return label
    }
}

If you want to apply any animation during scrolling, implement LTInfiniteScrollViewDelegate protocol:

public protocol LTInfiniteScrollViewDelegate: class {
    func updateView(view: UIView, withProgress progress: CGFloat, scrollDirection direction: ScrollDirection)
}

The value of progress dependends on the position of that view, if there are 5 visible views, the value will be ranged from -2 to 2:

|                  |
|-2  -1   0   1   2|
|                  |