Swift.日期选择器
实现效果:
controller弹出时:半透明背景渐变展示.时间选择器从下方弹出.选择器日期滚动到当前日期.
点击确认进行将数据回调到上一控制器,点击页面空白区域退出controller.
controller消失时:背景渐变消失,时间选择器向下退出.
实现方式:
1.首先写一个ViewController,将DatePicker加入.
2.实现DatePicker的展示效果与功能.
3.修改viewController的背景色,使其半透明.
4.实现我们需要的转场视图动画.
5.修改ViewController的transitioningDelegate,使其使用我们重写的转场视图动画.
1.首先写一个ViewController,将DatePicker加入.
let cancel = UIButton(frame: CGRect(x: 0, y: 10, width: 70, height: 20))
let sure = UIButton(frame: CGRect(x: ScreenInfo.Width - 80, y: 10, width: 70, height: 20))
cancel.setTitle("取消", for: .normal)
sure.setTitle("确认", for: .normal)
cancel.setTitleColor(UIColor.colorWithRGBA(r: 255, g: 51, b: 102, a: 1), for: .normal)
sure.setTitleColor(UIColor.colorWithRGBA(r: 255, g: 51, b: 102, a: 1), for: .normal)
cancel.addTarget(self, action: #selector(self.onClickCancel), for: .touchUpInside)
sure.addTarget(self, action: #selector(self.onClickSure), for: .touchUpInside)
picker = UIPickerView(frame: CGRect(x: 0, y: 24, width: ScreenInfo.Width, height: 216))
picker.delegate = self
picker.dataSource = self
picker.backgroundColor = UIColor.clear
picker.clipsToBounds = true//如果子视图的范围超出了父视图的边界，那么超出的部分就会被裁剪掉。
//创建日期选择器
self.containV.addSubview(cancel)
self.containV.addSubview(sure)
self.containV.addSubview(picker)
self.view.addSubview(self.containV)
2.实现DatePicker的展示效果与功能.
//MARK: - PickerViewDelegate
extension EWDatePickerViewController:UIPickerViewDelegate,UIPickerViewDataSource {
func numberOfComponents(in pickerView: UIPickerView) -> Int {
return 3
}
func pickerView(_ pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
if component == 0 {
return 10
}else if component == 1 {
return 12
}else {
let year: Int = pickerView.selectedRow(inComponent: 0) + currentDateCom.year!
let month: Int = pickerView.selectedRow(inComponent: 1) + 1
let days: Int = howManyDays(inThisYear: year, withMonth: month)
return days
}
}
private func howManyDays(inThisYear year: Int, withMonth month: Int) -> Int {
if (month == 1) || (month == 3) || (month == 5) || (month == 7) || (month == 8) || (month == 10) || (month == 12) {
return 31
}
if (month == 4) || (month == 6) || (month == 9) || (month == 11) {
return 30
}
if (year % 4 == 1) || (year % 4 == 2) || (year % 4 == 3) {
return 28
}
if year % 400 == 0 {
return 29
}
if year % 100 == 0 {
return 28
}
return 29
}
func pickerView(_ pickerView: UIPickerView, widthForComponent component: Int) -> CGFloat {
return ScreenInfo.Width / 3
}
func pickerView(_ pickerView: UIPickerView, rowHeightForComponent component: Int) -> CGFloat {
return 40
}
func pickerView(_ pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {
if component == 0 {
return "\((currentDateCom.year!) + row)\("年")"
}else if component == 1 {
return "\(row + 1)\("月")"
}else {
return "\(row + 1)\("日")"
}
}
func pickerView(_ pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {
if component == 1 {
pickerView.reloadComponent(2)
}
}
}
3.修改viewController的背景色,使其半透明.
var backgroundView:UIView = {
let view = UIView()
view.backgroundColor = UIColor(red: 0, green: 0, blue: 0, alpha: 0.4)
return view
}()
self.view.backgroundColor = UIColor.clear
self.view.insertSubview(self.backgroundView, at: 0)
self.modalPresentationStyle = .custom//viewcontroller弹出后之前控制器页面不隐藏 .custom代表自定义
4.实现我们需要的转场视图动画.
//EWDatePickerViewController的推出和取消动画
class EWDatePickerPresentAnimated: NSObject,UIViewControllerAnimatedTransitioning {
var type: EWDatePickerPresentAnimateType = .present
init(type: EWDatePickerPresentAnimateType) {
self.type = type
}
/// 动画时间
func transitionDuration(using transitionContext: UIViewControllerContextTransitioning?) -> TimeInterval {
return 0.3
}
/// 动画效果
func animateTransition(using transitionContext: UIViewControllerContextTransitioning) {
switch type {
case .present:
let toVC : EWDatePickerViewController = transitionContext.viewController(forKey: .to) as! EWDatePickerViewController
let toView = toVC.view
let containerView = transitionContext.containerView
containerView.addSubview(toView!)
toVC.containV.transform = CGAffineTransform(translationX: 0, y: (toVC.containV.frame.height))
UIView.animate(withDuration: 0.25, animations: {
/// 背景变色
toVC.backgroundView.alpha = 1.0
/// datepicker向上推出
toVC.containV.transform = CGAffineTransform(translationX: 0, y: -10)
}) { (finished) in
UIView.animate(withDuration: 0.2, animations: {
/// transform初始化
toVC.containV.transform = CGAffineTransform.identity
}, completion: { (finished) in
transitionContext.completeTransition(true)
})
}
case .dismiss:
let toVC : EWDatePickerViewController = transitionContext.viewController(forKey: .from) as! EWDatePickerViewController
UIView.animate(withDuration: 0.25, animations: {
toVC.backgroundView.alpha = 0.0
/// datepicker向下推回
toVC.containV.transform = CGAffineTransform(translationX: 0, y: (toVC.containV.frame.height))
}) { (finished) in
transitionContext.completeTransition(true)
}
}
}
}
5.修改ViewController的transitioningDelegate,使其使用我们重写的转场视图动画.
//MARK: - 转场动画delegate
extension EWDatePickerViewController:UIViewControllerTransitioningDelegate{
func animationController(forPresented presented: UIViewController, presenting: UIViewController, source: UIViewController) -> UIViewControllerAnimatedTransitioning? {
let animated = EWDatePickerPresentAnimated(type: .present)
return animated
}
func animationController(forDismissed dismissed: UIViewController) -> UIViewControllerAnimatedTransitioning? {
let animated = EWDatePickerPresentAnimated(type: .dismiss)
return animated
}
}
demo地址:DatePicker.求star.
有问题欢迎探讨.