Swift iOS视图控制器和导航模式

编程工人

2024-07-02 帮助1人

本章学习到了：

1，代码弹出模态框，点击空白处收回键盘的事件

2，关闭模态窗口

3，pageControl scroll的使用

4，UIPageViewController翻页效果，本页事件翻页快有bug

5，三级表视图，加载数据，跳转，一级传值数据到二级的操作

以下为学习时的Demo代码

代码弹出模态框，点击空白处收回键盘的事件

import UIKit
//代码弹出模态框，点击空白处收回键盘的事件
class ViewController: UIViewController {
@IBOutlet weak var username: UITextField!
@IBOutlet weak var password: UITextField!
//代码实现弹出模态框
@IBAction func onReg(_ sender: UIButton) {
//读取在故事板中定义的 ID : NavViewController
let NavViewController = self.storyboard?.instantiateViewController(withIdentifier: "NavViewController") as! UINavigationController
//弹出模态框
self.present(NavViewController, animated: true, completion: {() -> Void in
print("弹出模态框")
})
}
//NavViewController
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
//注册点击事件
self.view.addGestureRecognizer(UITapGestureRecognizer(target: self, action: #selector(handleTap)))
}
//点击空白处关闭键盘方法
func handleTap(sender: UITapGestureRecognizer) {
if sender.state == .ended {
print("收回键盘")
self.username.resignFirstResponder()//username放弃第一响应者
self.password.resignFirstResponder()//password放弃第一响应者
}
sender.cancelsTouchesInView = false
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
}

关闭模态窗口

import UIKit
//关闭模态窗口
class CreateViewController: UIViewController {
@IBAction func onCancel(_ sender: UIBarButtonItem) {
//关闭模态
self.dismiss(animated: true, completion: {() -> Void in
print("关闭模态")
})
}
@IBAction func onDone(_ sender: UIBarButtonItem) {
//关闭模态
self.dismiss(animated: true, completion: {() -> Void in
print("关闭模态")
})
}
@IBAction func onSave(_ sender: UIBarButtonItem) {
//TODO 保存数据
//关闭模态
self.dismiss(animated: true, completion: {() -> Void in
print("关闭模态")
})
}
override func viewDidLoad() {
super.viewDidLoad()
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
/*
// MARK: - Navigation
// In a storyboard-based application, you will often want to do a little preparation before navigation
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
// Get the new view controller using segue.destinationViewController.
// Pass the selected object to the new view controller.
}
*/
}

pageControl scroll的使用

import UIKit
//ScrollView与PageControl实现平铺导航（图片切换）
//创建一个主View加入ScrollView（设置为可分页）与PageControl
//创建三个View放入3个imageView@图片放进去，每个需要定义storyboardID
//pageControl scroll的使用
class PageViewController: UIViewController,UIScrollViewDelegate {
@IBOutlet weak var scroll: UIScrollView! //ScrollView输出口
@IBOutlet weak var pageControl: UIPageControl! //PageControl输出口
var page1: UIView! = nil
var page2: UIView! = nil
var page3: UIView! = nil
override func viewDidLoad() {
super.viewDidLoad()
//要实现UIScrollViewDelegate需要将当前scroll指向当前控制器
self.scroll.delegate = self
//----------------初始化，将page1，2，3加为Scroll的子视图-----------------//
//self.scroll.frame.size.height|width //当前视图的宽或高
let scrollWidth = self.scroll.frame.size.width
let scrollHeight = self.scroll.frame.size.height
//取得主storyboard
let mainStoryboard = self.storyboard
//设置scrollView实际内容的大小
self.scroll.contentSize = CGSize(width: scrollWidth * 3, height: scrollHeight)
//获取3个pageViewcontroller视图，，赋值给page，然后设置page的坐标与大小
let page1Viewcontroller = mainStoryboard?.instantiateViewController(withIdentifier: "page1")
self.page1 = page1Viewcontroller?.view
self.page1.frame = CGRect(x: 0, y: 0, width: scrollWidth, height: scrollHeight)
let page2Viewcontroller = mainStoryboard?.instantiateViewController(withIdentifier: "page2")
self.page2 = page2Viewcontroller?.view
self.page2.frame = CGRect(x: scrollWidth, y: 0, width: scrollWidth, height: scrollHeight)
let page3Viewcontroller = mainStoryboard?.instantiateViewController(withIdentifier: "page3")
self.page3 = page3Viewcontroller?.view
self.page3.frame = CGRect(x: scrollWidth * 2, y: 0, width: scrollWidth, height: scrollHeight)
//将page放到scrollView中
self.scroll.addSubview(page1)
self.scroll.addSubview(page2)
self.scroll.addSubview(page3)
}
//------------实现UIScrollViewDelegate协议方法
//实现滚动视图的滚动事件，图标滚动时 page的小点也跟个翻页
func scrollViewDidScroll(_ scrollView: UIScrollView) {
//获取scroll的偏移量对像
let offset = scrollView.contentOffset
//offset的x除以scrollWidth得到整数，赋值给pageControl的当前页
self.pageControl.currentPage = Int(offset.x) / Int(self.scroll.frame.size.width)
}
//PageControl动作事件，page小点变换时，图片也跟着变化
@IBAction func changaPage(_ sender: UIPageControl) {
//得到pageControl的当前页数
let whicth = self.pageControl.currentPage
//设置scroll的偏移量，这种方法比较生硬，没有动画效果
//self.scroll.contentOffset = CGPoint(x: CGFloat(whicth) * self.scroll.frame.size.width, y: 0)
//使用setContentOffset可设置动画效果
self.scroll.setContentOffset(CGPoint(x: CGFloat(whicth) * self.scroll.frame.size.width, y: 0), animated: true)
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
}

UIPageViewController翻页效果

import UIKit
//定义一个枚举
enum DirectionForward: Int{
case Before = 1 //向前翻页
case After = 2 //向后翻页
}
//UIPageViewController翻页效果，问题：当效果为scroll的时候，第二张会重复，第一页翻，前一页后一页方法都会调用？？？
class FanyeViewController: UIViewController,UIPageViewControllerDelegate,UIPageViewControllerDataSource {
//当前页的索引
var pageIndex = 0
//将枚举放到变量，翻页时随时更换
var directionForward = DirectionForward.Before //默认向后翻页
//定义当前视图控制器成员常量 pageViewController
var pageViewController: UIPageViewController!
override func viewDidLoad() {
super.viewDidLoad()
//实例化UIPageViewController
//UIPageViewControllerTransitionStyle为动画效果@翻书效果，枚举可以直接用点 .pageCurl
//UIPageViewControllerNavigationOrientation为设备朝向@水平的
self.pageViewController = UIPageViewController(transitionStyle: UIPageViewControllerTransitionStyle.pageCurl, navigationOrientation: UIPageViewControllerNavigationOrientation.horizontal, options: nil)
//指定pageViewController的delegate与dataSource的实现者为当前视图
self.pageViewController.delegate = self
self.pageViewController.dataSource = self
//取得主storyboard
let mainStoryboard = self.storyboard
//获取3个pageViewcontroller视图，，赋值给page，然后设置page的坐标与大小
let page1Viewcontroller = mainStoryboard?.instantiateViewController(withIdentifier: "page1")
//设置首页显示的视图为page1ViewController @ 第一个视图
let viewControllers: NSArray = [page1Viewcontroller as Any]
self.pageViewController.setViewControllers((viewControllers as! [UIViewController]),direction: .forward,animated: true, completion: nil)
//将pageViewController加入到当前视图中
self.view.addSubview(self.pageViewController.view)
}
//-----------------实现数据源DataSource协议方法
//设置向前一页，必须实现的方法
func pageViewController(_ pageViewController: UIPageViewController, viewControllerBefore viewController: UIViewController) -> UIViewController? {
//设置前当页索引
pageIndex = pageIndex - 1
if pageIndex < 0 {
pageIndex = 0
return nil
}
//print("Before\(pageIndex)")
self.directionForward = .Before
//NSString将字符串和数字拼接为String
let pageId = NSString(format:"page%i",pageIndex 1)
//获取当前的page*并return 返回
let pvcontroller = self.storyboard?.instantiateViewController(withIdentifier: pageId as String)
return pvcontroller
}
//设置向后一页，必须实现的方法
func pageViewController(_ pageViewController: UIPageViewController, viewControllerAfter viewController: UIViewController) -> UIViewController? {
//设置前当页索引
pageIndex = pageIndex 1
if pageIndex > 2 {
pageIndex = 2
return nil
}
//print("After\(pageIndex)")
self.directionForward = .After
//NSString将字符串和数字拼接为String
let pageId = NSString(format:"page%i",pageIndex 1)
//获取当前的page*并return 返回
let pvcontroller = self.storyboard?.instantiateViewController(withIdentifier: pageId as String)
return pvcontroller
}
//-----------------实现委托Delegate协议方法
//设置书脊和是否双面显示
func pageViewController(_ pageViewController: UIPageViewController, spineLocationFor orientation: UIInterfaceOrientation) -> UIPageViewControllerSpineLocation {
//true为双面显示，false为单面显示
self.pageViewController.isDoubleSided = false
//设置书脊为min最小，在左侧
return .min
}
//该委托方法是在翻页动作完成后触发的方法
func pageViewController(_ pageViewController: UIPageViewController, didFinishAnimating finished: Bool, previousViewControllers: [UIViewController], transitionCompleted completed: Bool) {
//completed ＝＝ true 说明翻页成功
//没有翻页成功设置
if completed == false {
if self.directionForward == .Before {//如果向前翻页
pageIndex = 1 //还原翻页之前
//print("qian:\(pageIndex)")
}else if self.directionForward == .After {//如果向后翻页
pageIndex -= 1 //还原翻页之前
//print("hou:\(pageIndex)")
}
}
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
}
}

三级表视图跳转传值：一级视图

import UIKit
//三级表视图，第一级 @ 其中cell连线到二级表视图时，选择selectionSegue为点击整个cell时，accessory为点击扩展图标
class TreeTableViewController: UITableViewController {
var allData: NSDictionary!
var provinces: NSArray!
override func viewDidLoad() {
super.viewDidLoad()
//获取plist文件路径
let plistPath = Bundle.main.path(forResource: "provinces_cities", ofType: "plist")
//获取属性列表文件中的全部数据保存到allData中
self.allData = NSDictionary(contentsOfFile: plistPath!)
//取allData字典所有key为数组放到provinces中
self.provinces = self.allData.allKeys as NSArray!
//设置当前Navigation下面表视图的标题
self.title = "省份信息"
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
//TableViewDataSource 协议方法实现
//返回表视图节的个数
override func numberOfSections(in tableView: UITableView) -> Int {
// #warning Incomplete implementation, return the number of sections
return 1
}
//返回表视图每个节中的行数
override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
// #warning Incomplete implementation, return the number of rows
return self.provinces.count
}
//返回每一个自定义cell 的内容
override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
//请求可重用单元格，需要一个标识,CustomCellTableViewCell为自定义单元格类
let cell = tableView.dequeueReusableCell(withIdentifier: "reuseIdentifier", for: indexPath) as UITableViewCell
//设置扩展视图的类型，就是Cell右侧的小箭头
cell.accessoryType = UITableViewCellAccessoryType.disclosureIndicator
//设置单元格中的主标题
cell.textLabel?.text = self.provinces[indexPath.row] as? String
return cell
}
//点击Cell会触发视图控制器的Segue方法
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
//判断是跳转的哪个segue，showtow为segue在故事板中定义的identifier
if segue.identifier == "showtwo" {
//得到二级（城市信息控制器）
let datailVC = segue.destination as! TreetwoTableViewController
//当前表视图被选择单元格
let indexPath = self.tableView.indexPathForSelectedRow
//以上得到的单元格的索引Row
let row = indexPath?.row
//当前单元格所对应的省份的名字
let selectname = self.provinces[row!]
//当前省份对应的城市信息的数组(将信息传给二级的listData)
datailVC.listData = self.allData[selectname] as! NSArray
//设置二级表视图名称
datailVC.title = selectname as? String
}
}
}

三级表视图跳转传值：二级视图

import UIKit
//三级表视图，第二级
class TreetwoTableViewController: UITableViewController {
//在一级视图获取当前cell的省信息中的城市信息为数据传递过来
var listData: NSArray! = nil
override func viewDidLoad() {
super.viewDidLoad()
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated
}
//TableViewDataSource 协议方法实现
//返回表视图节的个数
override func numberOfSections(in tableView: UITableView) -> Int {
// #warning Incomplete implementation, return the number of sections
return 1
}
//返回表视图每个节中的行数
override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
// #warning Incomplete implementation, return the number of rows
return self.listData.count
}
//返回每一个自定义cell 的内容
override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
//请求可重用单元格，需要一个标识,CustomCellTableViewCell为自定义单元格类
let cell = tableView.dequeueReusableCell(withIdentifier: "towidentifier", for: indexPath) as UITableViewCell
//设置扩展视图的类型，就是Cell右侧的小箭头
cell.accessoryType = UITableViewCellAccessoryType.disclosureIndicator
//某个省数据信息中的城市字典信息
let towDict = self.listData[indexPath.row] as! NSDictionary
//设置单元格中的主标题
cell.textLabel?.text = towDict["name"] as? String
return cell
}
//点击Cell会触发视图控制器的Segue方法
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
//判断是跳转的哪个segue，showthree为segue在故事板中定义的identifier
if segue.identifier == "showthree" {
//得到三级（城市信息控制器）
let datailVC = segue.destination as! TreeThreeViewController
//当前表视图被选择单元格
let indexPath = self.tableView.indexPathForSelectedRow
//以上得到的单元格的索引Row
let row = indexPath?.row
//当前单元格所对应的城市信息字典
let twoDict = self.listData[row!] as! NSDictionary
//当前省份对应的城市信息的数组(将信息传给三级的twoUrl)
datailVC.twoUrl = twoDict["url"] as! String
//设置三级表视图名称
let threeTitle = NSString(format:"百科:%@",(twoDict["name"] as? String)!)
datailVC.title = threeTitle as String
}
}

三级表视图跳转传值：二级视图

import UIKit
//三级表视图，第三级
class TreeThreeViewController: UIViewController,UIWebViewDelegate {
var twoUrl: String!
@IBOutlet weak var threewebHF: UIWebView! //webview输出口
//如果上下有灰色或出现黑色，需要先加webview在连线
override func viewDidLoad() {
super.viewDidLoad()
//设置访问资源 - 百度搜索
let url = URL(string: self.twoUrl)//只能https，http当前版本做了限制
//建立网络请求
let request = URLRequest(url: url!)
//加载网络请求
self.threewebHF.loadRequest(request)
//print(self.twoUrl)
self.threewebHF.delegate = self
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
}

这篇好文章是转载于：学新通技术网

Swift iOS视图控制器和导航模式

photoshop保存的图片太大微信发不了怎么办

word里面弄一个表格后上面的标题会跑到下面怎么办

photoshop扩展功能面板显示灰色怎么办

《学习通》视频自动暂停处理方法

TikTok加速器哪个好免费的TK加速器推荐

Android 11 保存文件到外部存储，并分享文件

微信公众号没有声音提示怎么办

excel下划线不显示怎么办

微信运动停用后别人还能看到步数吗

excel打印预览压线压字怎么办