SwipeableCards

A container of views (like cards) can be dragged!

视图容器，视图以卡片形式层叠放置，可滑动。

There are only visible cards in memory, after you drag and removed the top one, it will be reused as the last one.
内存中只会生成可见的卡片，顶部的卡片被划走之后，会作为最后一张卡片循环利用。

pod surpported:
支持pod :

target ‘xxx’ do
use_frameworks!
pod ‘SwipeableCards’
end

Usage:

Here is an example:
用法示例：

    @IBOutlet weak var cards: SwipeableCards!
    var cardsData = [Int]()

    override func viewDidLoad() {
        super.viewDidLoad()
        makeCardsData()
        cards.dataSource = self
        cards.delegate = self
    }

    func makeCardsData() {
        for i in 0..<100 {
            cardsData.append(i)
        }
    }

    // SwipeableCardsDataSource methods
    func numberOfTotalCards(cards: SwipeableCards) -> Int {
        return cardsData.count
    }
    func viewFor(cards: SwipeableCards, index: Int, reusingView: UIView?) -> UIView {
        var label: UILabel? = view as? UILabel
        if label == nil {
            let size = cards.frame.size
            let labelFrame = CGRect(x: 0, y: 0, width: size.width - 30, height: size.height - 20)
            label = UILabel(frame: labelFrame)
            label!.textAlignment = .Center
            label!.layer.cornerRadius = 5
        }
        label!.text = String(cardsData[index])
        label!.layer.backgroundColor = Color.randomColor().CGColor
        return label!
    }

    // SwipeableCardsDelegate
    func cards(cards: SwipeableCards, beforeSwipingItemAtIndex index: Int) {
        print("Begin swiping card \(index)!")
    }
    func cards(cards: SwipeableCards, didLeftRemovedItemAtIndex index: Int) {
        print("<--\(index)")
    }
    func cards(cards: SwipeableCards, didRightRemovedItemAtIndex index: Int) {
        print("\(index)-->")
    }
    func cards(cards: SwipeableCards, didRemovedItemAtIndex index: Int) {
        print("index of removed card:\(index)")
    }