序言： 需求是从数组中选择内容，需要可左右滑动选择，可点击选择，并且对选择的内容高亮显示和展示，且在需要时多个数组的数据进行联动选择。
- 满足这样的需求，比较简单的实现就是UIButton和UIScrollview的运用。
以下效果也是基于类似的思路实现：
2.gif
show the code
- 下载Demo-github地址
///pickerView Datasoure protocol
protocol THPickerDelegate {
func number(ofItems pickerView: THPickViewer) -> Int
func pickerView(_ pickerView: THPickViewer, itemForIndex index: Int) -> String
func pickerView(_ pickerView: THPickViewer, didSelect index: Int) -> ()
}
///pickerView
class THPickViewer: UIScrollView {
var datasource: THPickerDelegate?
var selectedIndex: Int = 0
var itemWidth: CGFloat = 0
private var items: Array<String>?
private var itemHeight: CGFloat = 0
init(_ frame: CGRect, layout count: Int, select selectedIndex: Int) {
super.init(frame: frame)
self.items = Array.init()
itemWidth = self.bounds.size.width/CGFloat(count)
itemHeight = self.bounds.size.height
self.selectedIndex = selectedIndex
self.showsVerticalScrollIndicator = false
}
required init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
func setUpPickerContents() -> () {
if (self.items?.count)! > 0 {
self.items?.removeAll()
for btn in self.subviews {
btn.removeFromSuperview()
}
}
let count = self.datasource?.number(ofItems: self)
for i in 0..<count! {
let title = self.datasource?.pickerView(self, itemForIndex: i)
self.items?.append(title!)
let btn = UIButton.init(frame: CGRect.init(x: CGFloat.init(i) * itemWidth + itemWidth, y: 0, width: itemWidth, height: itemHeight))
btn.tag = i
btn.setTitle(title, for: .normal)
btn.addTarget(self, action: #selector(clickItemAction(_:)), for: .touchUpInside)
if i == self.selectedIndex {
btn.setTitleColor(UIColor.Color(WithHex: 0x418eff), for: .normal)
btn.titleLabel?.font = UIFont.PingFangSC(with: UIFont.PingFangType.PingFangSCMedium, size: 26)
}else {
btn.setTitleColor(UIColor.Color(WithHex: 0x999999), for: .normal)
btn.titleLabel?.font = UIFont.PingFangSC(with: UIFont.PingFangType.PingFangSCMedium, size: 18)
}
self.addSubview(btn)
}
self.contentMode = .scaleAspectFit
self.contentSize = CGSize.init(width: (CGFloat.init(count!)+2)*itemWidth, height: itemHeight)
let offPoint = CGPoint.init(x: (CGFloat.init(self.selectedIndex+1) * itemWidth)-(self.bounds.size.width-self.itemWidth)/2, y: 0)
self.setContentOffset(offPoint, animated: true)
}
func selectIndexAnimation(WithIndex selectColume: Int, offect offPoint: CGPoint) -> () {
self.selectedIndex = selectColume
setUpPickerContents()
self.setContentOffset(offPoint, animated: true)
}
@objc private func clickItemAction(_ sender: UIButton) -> () {
let index = sender.tag
let offPoint = CGPoint.init(x: (CGFloat.init(index+1) * itemWidth)-(self.bounds.size.width-self.itemWidth)/2, y: 0)
self.selectIndexAnimation(WithIndex: index, offect: offPoint)
self.datasource?.pickerView(self, didSelect: index+1)
}
/*
// Only override draw() if you perform custom drawing.
// An empty implementation adversely affects performance during animation.
override func draw(_ rect: CGRect) {
// Drawing code
}
*/
}
