从此踏上了Swift的学习道路

在用Swift重写公司的项目中我计划先写一个工具类的三方库，主要集中我平时在项目中用到的工具类，点击查看库文件LYTools，目前还处于开始阶段，之前用的OC的比较方便的库在此慢慢都用Swift重写一遍。

正文

此处记录一个时间选择的工具，可以按照年月日时分选择，直接看效果图吧,图片前面是使用代码，这里使用的block，也可以选择使用代理方法

let pickView = LYDatePicker.init(component: 2)
pickView.ly_datepickerWithFiveComponent = {(date:Date,year:NSInteger,month:NSInteger,day:NSInteger,hour:NSInteger,minute:NSInteger) -> Void in
}
pickView.show()

image

let pickView = LYDatePicker.init(component: 3)
pickView.ly_datepickerWithFiveComponent = {(date:Date,year:NSInteger,month:NSInteger,day:NSInteger,hour:NSInteger,minute:NSInteger) -> Void in
}
pickView.show()

image

let pickView = LYDatePicker.init(component: 4)
pickView.ly_datepickerWithFiveComponent = {(date:Date,year:NSInteger,month:NSInteger,day:NSInteger,hour:NSInteger,minute:NSInteger) -> Void in
}
pickView.show()

image

let pickView = LYDatePicker.init(component: 5)
pickView.ly_datepickerWithFiveComponent = {(date:Date,year:NSInteger,month:NSInteger,day:NSInteger,hour:NSInteger,minute:NSInteger) -> Void in
}
pickView.show()

image

源码

首先需要一个Date的扩展文件“Date+Category.swift”，主要提供时间格式转换以及特殊时间取值等,下面列举使用到的扩展方法，想要查看更多可以到LYTools下载源码，好用请start，也欢迎来讨论技术

extension Date{
//本年
static func currentYear() -> NSInteger {
let components = calendar.dateComponents(unitFlags, from: Date())
return components.year!
}
//本月
static func currentMonth() -> NSInteger {
let components = calendar.dateComponents(unitFlags, from: Date())
return components.month!
}
//本日
static func currentDay() -> NSInteger {
let components = calendar.dateComponents(unitFlags, from: Date())
return components.day!
}
//当前小时
static func currentHour() -> NSInteger {
let components = calendar.dateComponents(unitFlags, from: Date())
return components.hour!
}
//当前分钟
static func currentMinute() -> NSInteger {
let components = calendar.dateComponents(unitFlags, from: Date())
return components.minute!
}
//时间字符串转换为日期
static func dateFromDateString(format: String, dateString: String) -> Date {
if format.isEmpty || dateString.isEmpty{
return Date()
}
let whiteSpace = CharacterSet.whitespacesAndNewlines
if format.trimmingCharacters(in: whiteSpace).isEmpty || dateString.trimmingCharacters(in: whiteSpace).isEmpty{
return Date()
}
if format == "0" || dateString == "0"{
return Date()
}
let dateFormat = DateFormatter()
dateFormat.dateFormat = format
let date = dateFormat.date(from: dateString)
if date != nil{
return date!
}
return Date()
}
static func dayCountInYearAndMonth(year:NSInteger, month:NSInteger) -> Int{
switch month {
case 1,3,5,7,8,10,12:
return 31
case 4,6,9,11:
return 30
case 2:
if year % 400 == 0 || (year % 100 != 0 && year % 4 == 0){
return 29
}else{
return 28
}
default:
return 0
}
}
}

下面是主要代码，时间显示上主要注意月，日的特殊处理，难点主要在于时间选择后如何能够避免某年某月中日的更换。此工具类通过代理或者block均可获取到选择的时间，下面的代码中直接复制使用会出现问题是因为我在写这个项目中使用了另一个工具类“UIView+Category.Swift”来直接赋值view的x或者y等，稍微修改后即可正常使用

import UIKit

@objc
protocol LYDatePickerDelete : NSObjectProtocol{
@objc func ly_datePickerChoosedTime(date:Date)
}

class LYDatePicker: UIControl {

var component : Int = 3

var delegate : LYDatePickerDelete?

var date = Date()
var year = Date.currentYear()
var month = Date.currentMonth()
var day = Date.currentDay()
var hour = Date.currentHour()
var minute = Date.currentMinute()

let yearEerliest = 1900//年份从1900年开始
let yearSum = 200//年份一共有200个选择

//点击确定后的block回调
typealias OneComponentBlock = (Date,NSInteger) -> Void
var ly_datepickerWithOneComponent : OneComponentBlock?
typealias TwoComponentBlock = (Date,NSInteger,NSInteger) -> Void
var ly_datepickerWithTwoComponent : TwoComponentBlock?
typealias ThreeComponentBlock = (Date,NSInteger,NSInteger,NSInteger) -> Void
var ly_datepickerWithThreeComponent : ThreeComponentBlock?
typealias FourComponentBlock = (Date,NSInteger,NSInteger,NSInteger,NSInteger) -> Void
var ly_datepickerWithFourComponent : FourComponentBlock?
typealias FiveComponentBlock = (Date,NSInteger,NSInteger,NSInteger,NSInteger,NSInteger) -> Void
var ly_datepickerWithFiveComponent : FiveComponentBlock?


fileprivate lazy var subView : UIView = {
let view = UIView(frame:CGRect(x:0,y:kScreenH - 230 - 44,width:kScreenW,height:230 + 44))
view.backgroundColor = UIColor.white
return view
}()

fileprivate lazy var pickerView : UIPickerView = {
let pickerView = UIPickerView(frame:CGRect(x:0,y:44,width:kScreenW,height:230))
pickerView.backgroundColor = UIColor.white
pickerView.delegate = self
pickerView.dataSource = self
return pickerView
}()

fileprivate lazy var sureBtn : UIButton = {
let btn = UIButton(type:.custom)
btn.setTitle("确定", for: .normal)
btn.titleLabel?.font = UIFont.systemFont(ofSize: 15.0)
btn.setTitleColor(UIColor.RGBS(s: 33), for: .normal)
btn.addTarget(self, action: #selector(LYDatePicker.sureAction), for: .touchUpInside)
return btn
}()
fileprivate lazy var cancleBtn : UIButton = {
let btn = UIButton(type:.custom)
btn.setTitle("取消", for: .normal)
btn.titleLabel?.font = UIFont.systemFont(ofSize: 15.0)
btn.setTitleColor(UIColor.RGBS(s: 33), for: .normal)
btn.addTarget(self, action: #selector(LYDatePicker.cancleAction), for: .touchUpInside)
return btn
}()
fileprivate lazy var titleLbl : UILabel = {
let lbl = UILabel()
lbl.textAlignment = .center
lbl.textColor = UIColor.RGBS(s: 33)
lbl.font = UIFont.systemFont(ofSize: 15.0)
lbl.text = "请选择时间"
return lbl
}()

init(component:Int) {
if component > 5{
self.component = 5
}else{
self.component = component
}

super.init(frame:CGRect(x:0,y:0,width:kScreenW,height:kScreenH))

self.setUpGlobalViews()
}

required init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}

}

extension LYDatePicker{

func setUpGlobalViews() {
//1.点击背景取消选择
self.backgroundColor = UIColor.clear
let bg_btn = UIButton(frame:self.bounds)
bg_btn.backgroundColor = UIColor.black
bg_btn.alpha = 0.3
self.addSubview(bg_btn)
bg_btn.addTarget(self, action: #selector(LYDatePicker.cancleAction), for: .touchDown)

//2.时间选择器
self.subView.addSubview(self.pickerView)
//年是从1900开始计算，时和分都是从0开始计算，尾数为0，因此索引正常；月和日从1计算，因此索引要减去1
self.pickerView.selectRow(self.year - yearEerliest, inComponent: 0, animated: false)
if self.component > 1{
self.pickerView.selectRow(self.month - 1, inComponent: 1, animated: false)
}
if self.component > 2{
self.pickerView.selectRow(self.day - 1, inComponent: 2, animated: false)
}
if self.component > 3{
self.pickerView.selectRow(self.hour, inComponent: 3, animated: false)
}
if self.component > 4{
self.pickerView.selectRow(self.minute, inComponent: 4, animated: false)
}



//3.确定，取消按钮
let btnView = UIView(frame:CGRect(x:0,y:0,width:kScreenW,height:44))
self.cancleBtn.frame = CGRect(x:10,y:5,width:60,height:35)
self.titleLbl.frame = CGRect(x:80,y:5,width:kScreenW-160,height:35)
self.sureBtn.frame = CGRect(x:kScreenW-60-10,y:5,width:60,height:35)
let line = UIView(frame:CGRect(x:0,y:43,width:kScreenW,height:1))
line.backgroundColor = UIColor.RGBS(s: 240)
btnView.backgroundColor = UIColor.white
btnView.addSubview(cancleBtn)
btnView.addSubview(titleLbl)
btnView.addSubview(sureBtn)
btnView.addSubview(line)
self.subView.addSubview(btnView)
}


func sureAction() {

if (self.ly_datepickerWithOneComponent != nil) {
self.ly_datepickerWithOneComponent!(self.date,self.year)
}
if (self.ly_datepickerWithTwoComponent != nil) {
self.ly_datepickerWithTwoComponent!(self.date,self.year,self.month)
}
if (self.ly_datepickerWithThreeComponent != nil) {
self.ly_datepickerWithThreeComponent!(self.date,self.year,self.month,self.day)
}
if (self.ly_datepickerWithFourComponent != nil) {
self.ly_datepickerWithFourComponent!(self.date,self.year,self.month,self.day,self.hour)
}
if (self.ly_datepickerWithFiveComponent != nil) {
self.ly_datepickerWithFiveComponent!(self.date,self.year,self.month,self.day,self.hour,self.minute)
}

if (self.delegate != nil){
self.delegate?.ly_datePickerChoosedTime(date: self.date)
}

}


func cancleAction() {
UIApplication.shared.keyWindow?.addSubview(self)
UIApplication.shared.keyWindow?.bringSubview(toFront: self)

UIView.animate(withDuration: 0.25, animations: {
self.subView.y = kScreenH
}){(completion) in
self.removeFromSuperview()
}
}

func show() {
UIApplication.shared.keyWindow?.addSubview(self)
UIApplication.shared.keyWindow?.bringSubview(toFront: self)

self.subView.y = kScreenH
self.addSubview(self.subView)
UIView.animate(withDuration: 0.25, animations: {
self.subView.y = kScreenH - 230 - 44
})


}
}



extension LYDatePicker : UIPickerViewDelegate,UIPickerViewDataSource{
func numberOfComponents(in pickerView: UIPickerView) -> Int {
return self.component
}

func pickerView(_ pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
switch component {
case 0:
return yearSum
case 1:
return 12
case 2:
return Date.dayCountInYearAndMonth(year: self.year, month: self.month)
case 3:
return 24
case 4:
return 60
default:
return 0
}
}

func pickerView(_ pickerView: UIPickerView, viewForRow row: Int, forComponent component: Int, reusing view: UIView?) -> UIView {
let lbl = UILabel(frame:CGRect(x:0, y:0, width:kScreenW / 6.0, height:30))
lbl.textColor = UIColor.RGBS(s: 33)
lbl.textAlignment = .center
lbl.font = UIFont.systemFont(ofSize: 14.0)
switch component {
case 0:
lbl.text = "\(row + self.yearEerliest)年"
case 1:
lbl.text = "\(row + 1)月"
case 2:
lbl.text = "\(row + 1)日"
case 3:
lbl.text = "\(row)时"
case 4:
lbl.text = "\(row)分"
default:
lbl.text = ""
}

return lbl
}

func pickerView(_ pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {
if component == 0 || component == 1{
if self.component > 2{
let nextYear = self.pickerView.selectedRow(inComponent: 0)
let nextMonth = self.pickerView.selectedRow(inComponent: 1) + 1

if self.day == 31{
if [4,6,9,11].contains(nextMonth){
self.pickerView.selectRow(29, inComponent: 2, animated: false)
}else if nextMonth == 2{
if Date.dayCountInYearAndMonth(year: nextYear, month: nextMonth) == 28{
self.pickerView.selectRow(27, inComponent: 2, animated: false)
}else{
self.pickerView.selectRow(28, inComponent: 2, animated: false)
}
}
}else if self.day == 30 || self.day == 29{
if nextMonth == 2{
if Date.dayCountInYearAndMonth(year: nextYear, month: nextMonth) == 28{
self.pickerView.selectRow(27, inComponent: 2, animated: false)
}else{
self.pickerView.selectRow(28, inComponent: 2, animated: false)
}
}
}
}
}
self.resetDate()
}

func resetDate() {

self.year = self.pickerView.selectedRow(inComponent: 0) + yearEerliest
if self.component > 1{
self.month = self.pickerView.selectedRow(inComponent: 1) + 1
}
if self.component > 2{
self.day = self.pickerView.selectedRow(inComponent: 2) + 1
}
if self.component > 3{
self.hour = self.pickerView.selectedRow(inComponent: 3)
}
if self.component > 4{
self.minute = self.pickerView.selectedRow(inComponent: 4)
}

self.date = Date.dateFromDateString(format: "yyyy-MM-dd HH:mm", dateString: "\(self.year)-\(self.month)-\(self.day) \(self.hour):\(self.minute)")

self.pickerView.reloadAllComponents()

}
}

注明

还有OC版的同样的时间选择器，这里就不放出来了，如过有需要可联系我，坚持开源，免费分享