swift语言IOS8开发战记19 UIImagePickerController

Posted 2023-01-29 秋雨暗千家

  我们接着上一话的内容来讲，首先在我们添加一个餐馆的页面中把点击的背景色取消掉使用的是以下语句：

cell.selectionStyle = UITableViewCellSelectionStyle.None

除了none之外，还有许多颜色的选项，大家可以自己试试。然后我们需要点击小相机的图片能打开我们的相册让我们选择图片，我们在选择的代理方法中增加一个我们自己定义的方法，代码如下：

func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) //点击行的代理方法
        var row:NSInteger = indexPath.row
        if row == 0
        self.didClickedImageView()
        

下面是didClickedImageView的代码：

func didClickedImageView()
    let imagePicker = UIImagePickerController() //选择图片
    let isAvailable = UIImagePickerController.isSourceTypeAvailable(UIImagePickerControllerSourceType.Camera)
        imagePicker.sourceType = .PhotoLibrary
        if isAvailable 
            imagePicker.sourceType = .Camera
        
        self.presentViewController(imagePicker, animated: true, completion: nil)
    

点击小相机的图标显示如下：

现在我们希望我们选择了照片之后可以把该照片保存到第一行之中，这就需要在点击第一行的时候把当前的类当做imagePicker的代理，所以把点击第一行所触发的方法didClickedImageView修改如下：

func didClickedImageView()
    let imagePicker = UIImagePickerController() //选择图片
    let isAvailable = UIImagePickerController.isSourceTypeAvailable(UIImagePickerControllerSourceType.Camera)
        imagePicker.sourceType = .PhotoLibrary
        imagePicker.delegate = self//代理设为自己
        if isAvailable 
            imagePicker.sourceType = .Camera
        
        self.presentViewController(imagePicker, animated: true, completion: nil)
    

imagePicker是UIImagePickerController类型的，要实现这个类型的代理，必须继承 UINavigationControllerDelegate和UIImagePickerControllerDelegate，然后我们实现代理方法imagePickerController用来保存我们选择的图片，代码如下：

 func imagePickerController(picker: UIImagePickerController!, didFinishPickingImage image: UIImage!, editingInfo: [NSObject : AnyObject]!) //保存图片
        imageView.image = image
            picker.dismissViewControllerAnimated(true, completion: nil)
        

在选中图片后，效果如图

接下来我们来实现下面这几行，代码如下：

 func configureCell(cell:UITableViewCell, indexPath: NSIndexPath)
        let row:NSInteger = indexPath.row
        var nameLabel = UILabel(frame: CGRectMake(10, 5, 200, 15))
            switch row
        case 0:
         imageView = UIImageView(frame: CGRectMake(0, 0, 320, 250))
            imageView.image = UIImage(named: "camera")
            imageView.contentMode = UIViewContentMode.ScaleAspectFit
            cell.addSubview(imageView)
        case 1:
            nameLabel.text = "Name"
            cell.addSubview(nameLabel)
                var textFiled = UITextField(frame: CGRectMake(10, 20, 250, 40))
            textFiled.placeholder = "Restaurant Name"
                cell.addSubview(textFiled)
        case 2:
            nameLabel.text = "Type"
            cell.addSubview(nameLabel)
            var textFiled = UITextField(frame: CGRectMake(10, 20, 250, 40))
            textFiled.placeholder = "Restaurant Type"
            cell.addSubview(textFiled)
            
        case 3:
            nameLabel.text = "Location"
            cell.addSubview(nameLabel)
            var textFiled = UITextField(frame: CGRectMake(10, 20, 250, 40))
            textFiled.placeholder = "Restaurant Location"
            cell.addSubview(textFiled)
        default:
            nameLabel.text = "Have you been here？"
            cell.addSubview(nameLabel)
            
            
        
    

结构都比较相似，我们把之前的if结构改成了switch，UITextFiled有一个属性placeholder，实现了水印字体的效果，效果如下：

在最后一栏中需要加两个按钮，一个YES和一个NO，然后再导航栏中增加一个标题，NewViewController的完整代码如下：

import UIKit

class NewViewController: UIViewController,UITableViewDataSource,UITableViewDelegate,UINavigationControllerDelegate,UIImagePickerControllerDelegate  
let identifier = "newCell"
    var imageView:UIImageView!
    override func viewDidLoad() 
        super.viewDidLoad()
self.view.backgroundColor = UIColor.orangeColor()
        
        //增加一个tableview
        var tableView = UITableView(frame: self.view.bounds, style: .Plain)
        tableView.dataSource = self
        tableView.delegate = self
        tableView.registerClass(UITableViewCell.self, forCellReuseIdentifier: "newCell")
        self.view.addSubview(tableView)
        self.navigationItem.title = "New Restaurant"
        
    
    func numberOfSectionsInTableView(tableView: UITableView) -> Int 
        return 1
    
    func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int 
        return 5
    
    func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell 
        
        let cell = UITableViewCell(style: .Default, reuseIdentifier: "newCell")
        self.configureCell(cell, indexPath: indexPath)
        cell.selectionStyle = UITableViewCellSelectionStyle.None//选中的背景色
        return cell
    
    func tableView(tableView: UITableView, heightForRowAtIndexPath indexPath: NSIndexPath) -> CGFloat 
        var row:NSInteger = indexPath.row
        var rowHeight:CGFloat = 62
        if row == 0
        
        rowHeight = 250
        
        return rowHeight
    
    func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) 
        var row:NSInteger = indexPath.row
        if row == 0
        self.didClickedImageView()
        
    
    
    func configureCell(cell:UITableViewCell, indexPath: NSIndexPath)
        let row:NSInteger = indexPath.row
        var nameLabel = UILabel(frame: CGRectMake(10, 5, 200, 15))
            switch row
        case 0:
         imageView = UIImageView(frame: CGRectMake(0, 0, 320, 250))
            imageView.image = UIImage(named: "camera")
            imageView.contentMode = UIViewContentMode.ScaleAspectFit
            cell.addSubview(imageView)
        case 1:
            nameLabel.text = "Name"
            cell.addSubview(nameLabel)
                var textFiled = UITextField(frame: CGRectMake(10, 20, 250, 40))
            textFiled.placeholder = "Restaurant Name"
                cell.addSubview(textFiled)
        case 2:
            nameLabel.text = "Type"
            cell.addSubview(nameLabel)
            var textFiled = UITextField(frame: CGRectMake(10, 20, 250, 40))
            textFiled.placeholder = "Restaurant Type"
            cell.addSubview(textFiled)
            
        case 3:
            nameLabel.text = "Location"
            cell.addSubview(nameLabel)
            var textFiled = UITextField(frame: CGRectMake(10, 20, 250, 40))
            textFiled.placeholder = "Restaurant Location"
            cell.addSubview(textFiled)
        default:
            nameLabel.text = "Have you been here？"
            cell.addSubview(nameLabel)
            var leftBtn = UIButton(frame: CGRectMake(10, 30, 50, 25))
            leftBtn.setTitle("YES", forState: .Normal)
                leftBtn.setTitleColor(UIColor.whiteColor(), forState: .Normal)
                leftBtn.backgroundColor = UIColor.redColor()
                cell.addSubview(leftBtn)
            var rightBtn = UIButton(frame: CGRectMake(90, 30, 50, 25))
            rightBtn.setTitle("NO", forState: .Normal)
            rightBtn.setTitleColor(UIColor.whiteColor(), forState: .Normal)
            rightBtn.backgroundColor = UIColor.grayColor()
                cell.addSubview(rightBtn)
            
        
    
    
    func didClickedImageView()
    let imagePicker = UIImagePickerController() //选择图片
    let isAvailable = UIImagePickerController.isSourceTypeAvailable(UIImagePickerControllerSourceType.Camera)
        imagePicker.sourceType = .PhotoLibrary
        imagePicker.delegate = self
        if isAvailable 
            imagePicker.sourceType = .Camera
        
        self.presentViewController(imagePicker, animated: true, completion: nil)
    
    
    func imagePickerController(picker: UIImagePickerController!, didFinishPickingImage image: UIImage!, editingInfo: [NSObject : AnyObject]!) //保存图片
        imageView.image = image
            picker.dismissViewControllerAnimated(true, completion: nil)