Swift学习记录 Day 4

2018-02-07 本文已影响0人那不是随你

从100 Days of Swift中学习，实践

目前正在学习swift , 刚刚接触了解了一部分语法后就因为自己在OC上使用reactiveOBJC还算熟练，想直接学会rxswift和reactiveswift ，中间因为xcode有时候索引失效和一些其他原因，想过放弃学习，无意中看到关于iOS学习进阶的必读一些博客总结这个文章时看到了 100 Days of Swift，感觉从一次次项目中，更加能够坚实我的基础，所以决定从基础开始，跟着一步步往前走

Day 4

可以先来说一下我的ViewController分层
代码：

//MARK:-视图加载

//MARK:-自定义方法

//MARK:-事件

//MARK:-代理方法

//MARK:-数据源


//MARK:-生命周期
override func viewDidLoad() {
    super.viewDidLoad()
    
}

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
}

//MARK:-懒加载

当然在extension 里面实现delegate

PROJECT 7 - PASSING DATA TO ANOTHER VIEW
传递数据到另一个view**

代码：

//FirstViewController
let secondVC:SecondViewController = UIStoryboard.init(name: "Main", bundle: nil).instantiateViewController(withIdentifier: "SecondViewController") as! SecondViewController
secondVC.restoreText = self.message

//SecondViewController
 var  restoreText:String?

PROJECT 8 - SWIPE TO DISMISS KEYBOARD
实现一个向下拖拽的方法，使键盘消失
代码：

    @IBOutlet weak var MessageTextView: UITextView!

   fileprivate func initEvents(){
        let swipeDownGesture = UISwipeGestureRecognizer(target: self, action:#selector(downGesture(_:)))
        swipeDownGesture.direction = UISwipeGestureRecognizerDirection.down //不设置是右
        MessageTextView.addGestureRecognizer(swipeDownGesture)
   }
    @objc fileprivate func downGesture(_ gesture:UISwipeGestureRecognizer){
        MessageTextView.resignFirstResponder()
    }

PROJECT 9 - ADD PHOTO FROM CAMERA ROLL

Access the Camera Roll from within the App
Create Image Picker Controller
Handle a selected image in the Camera Roll
Control how the image is displayed to prevent stretching

主要难点在于添加图片到textview中
思路：
1.首先要能够进入相册(我这里直接使用了相册，并没有使用camera)
2.选中图片后获取到图片
3.富文本内容，用NSAttributeString承接
4.在接收到图片以后需要进行哪里处理？
先将已有内容保存下来，然后用NSAttachment接收到Image ，然后通过其内的方法转为NSAttributeString

需要注意的事项

NSAttachment.bounds可以用来调整图片大小和图片位置
在添加完图片以后需要调整光标位置，并且将view移动到光标处，并且需要设置内容的字体大小（之前设置的是textFont， NSAttributedText的字体还未设置）

未解决的问题

在textview中直接在NSAttributerString中追加"\n" 或者"\r\n" 无法换行,如果设置图片的模式是适配textview的宽度，那么就会导致添加图片后，光标在图片右边，而换行后的位置。目前我还没有好的解决方案，只能先做成在添加完图片以后，textview失去第一响应，来让用户自己选择光标位置。如果有什么好的解决方案，请联系我！！

(学习过程用，遇到不太会的知识，尽量去找文档，翻Dash，也许会比直接baidu现成的代码更好)
代码

import UIKit

enum ImageAttachmentMode {
    case Default  //默认（不改变大小）
    case FitTextLine  //使尺寸适应行高
    case FitTextView  //使尺寸适应textView
}

class ViewController: UIViewController {

    @IBOutlet weak var MessageTextView: UITextView!
    
    var message:String?
    
    //MARK:-视图加载
    fileprivate func setupUI() {
//        let rightItem = UIBarButtonItem.init(title: "Done", style: UIBarButtonItemStyle.done, target: self, action: #selector(rightBtnClick(_:)))
        let rightItem = UIBarButtonItem.init(barButtonSystemItem: UIBarButtonSystemItem.camera, target: self, action: #selector(rightBtnClick(_:)))
//        rightItem.setBackgroundImage(UIImage(), for: UIControlState.normal, barMetrics: UIBarMetrics.default)
//        rightItem.setBackgroundImage(UIImage(), for: UIControlState.highlighted, barMetrics: UIBarMetrics.default)
//        rightItem.
        self.navigationItem.rightBarButtonItem = rightItem
        
    }
    //MARK:-自定义方法
    
    fileprivate func initEvents(){
        let swipeDownGesture = UISwipeGestureRecognizer(target: self, action:#selector(downGesture(_:)))
        swipeDownGesture.direction = UISwipeGestureRecognizerDirection.down //不设置是右
        MessageTextView.addGestureRecognizer(swipeDownGesture)
    }
    
    fileprivate func insertPicture(_ image:UIImage,_ model:ImageAttachmentMode = .Default){
        //将现存所有文字转为 NSMutableAttributedString
        let mutableString = NSMutableAttributedString.init()
        mutableString.append(MessageTextView.attributedText)
        //获取光标的位置
        let mutableSelectRange = MessageTextView.selectedRange
        
        //创建附件，来保存图片
        let imgAttachment = NSTextAttachment.init()
        
        //用来保存附件 attachment转化的attributeString
        var imageAttributeString:NSAttributedString
        
        //主要两个属性   一个image，图片资源，   一个bounds 图片位置
        imgAttachment.image = image
        
        //根据模式选择图片放置的模式
        switch model {
            //适应文字大小
        case .FitTextLine:
            imgAttachment.bounds = CGRect.init(x: 0, y: -4, width: (MessageTextView.font?.lineHeight)!, height: (MessageTextView.font?.lineHeight)!)
            //适应textview的宽度 撑满一行
        case .FitTextView:
            let imageWidth = MessageTextView.bounds.width-10
            let imageHeight = image.size.height/image.size.width*imageWidth
            imgAttachment.bounds = CGRect.init(x: 0, y: 0, width: imageWidth, height: imageHeight)
        
        default:
            break
        }
        
        imageAttributeString = NSAttributedString.init(attachment: imgAttachment)
        
        mutableString.append(imageAttributeString)
 
        mutableString.addAttribute(NSAttributedStringKey.font, value: UIFont.systemFont(ofSize: 17), range: NSMakeRange(0,mutableString.length))
        
        //记住新的光标位置
        let newSelectRange = NSMakeRange(mutableSelectRange.location+1,0)
        
        //赋值到textview
        MessageTextView.attributedText = mutableString
        //刷新光标
        MessageTextView.selectedRange = newSelectRange
        //滚动到光标位置
        MessageTextView.scrollRangeToVisible(newSelectRange)
        
    }
    
    
    //MARK:-事件
    @objc fileprivate func rightBtnClick(_ sender:UIBarButtonItem){

//        let secondVC:SecondViewController = UIStoryboard.init(name: "Main", bundle: nil).instantiateViewController(withIdentifier: "SecondViewController") as! SecondViewController
//        secondVC.restoreText = self.message
//        self.navigationController?.pushViewController(secondVC, animated: true)
        
        //访问相册页面
        //从Dash文档上根据文档说明，步骤进行开发
        if UIImagePickerController.isSourceTypeAvailable(UIImagePickerControllerSourceType.photoLibrary){
            UIImagePickerController.availableMediaTypes(for: UIImagePickerControllerSourceType.photoLibrary)
            
            let vc = UIImagePickerController.init()

            vc.delegate = self
            
            self.present(vc, animated: true, completion: {
                
            })
            
        }
        else {

        }
  
    }
    
    @objc fileprivate func downGesture(_ gesture:UISwipeGestureRecognizer){
        MessageTextView.resignFirstResponder()
    }
    
    //MARK:-代理方法
    
    
    
    //MARK:-数据源
    
    
    //MARK:-生命周期
    override func viewDidLoad() {
        super.viewDidLoad()
        setupUI()
        initEvents()
    }
    
    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }
  
    //MARK:-懒加载
}

extension ViewController: UIImagePickerControllerDelegate,UINavigationControllerDelegate{
    func imagePickerControllerDidCancel(_ picker: UIImagePickerController) {
        
    }
    func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any]) {
        let image = info[UIImagePickerControllerOriginalImage]
        self.insertPicture(image as! UIImage,.FitTextView)
        self.MessageTextView.resignFirstResponder()
        picker.dismiss(animated: true, completion: nil)
    }   
}

extension ViewController:UITextViewDelegate{
    func textViewDidEndEditing(_ textView: UITextView) {
        message = textView.text
        textView.resignFirstResponder()
    }

}

PROJECT 10 - PULL TO REFRESH TABLE VIEW （未完成自定义refresh功能）

Build a custom Table View Controller
Create custom Refresh Control
Stop refresh animation when data finishes updating
Update the table with refreshed local data

还在学习MJRefresh源码中，之后补上

PROJECT 11 - DELETING AND REARRANGING

Remove data from Data Source
Delete data from Table Row
Animate the item deletion
Handle rearranging Table Rows
Enable swipe to delete Table Row

PROJECT 12 - ADD NEW ITEM

Create a Model to interact with View Controllers
Add data to the Model
Update the Table View when the View loads
Dismiss the View from the Keyboard Done key
Segue to new Views from a Button (没有使用segue)

除了project 10 其他内容也相对简单，整合在一起记录。

使用ViewModel的Array 作为tableview的数据源
查找tableview的delegate方法，删除，移动，根据操作修改ViewModel的Array数据
从SecondViewController中点击Done 添加此数据到ViewModel的Array中。并且通过闭包回调到FirstViewController，刷新tableview

代码:
FirstViewController

import UIKit

class ViewController: UITableViewController {

    //MARK:-视图加载
    
    //MARK:-自定义方法
    
    //MARK:-事件
    @objc func Edit(){
        self.tableView.isEditing = !self.tableView.isEditing
    }
    @objc func Add(){
        let vc:AddViewController = UIStoryboard(name: "Main", bundle: nil).instantiateViewController(withIdentifier: "AddViewController") as! AddViewController
        self.navigationController?.pushViewController(vc, animated: true)
        weak var weakself = self
//回调方法
        vc.sendHandler { (str) in
            weakself?.viewmodel.Movies.append(str)
            weakself?.tableView.reloadData()
        }
        
        
    }
    
    //MARK:-代理方法
    override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
//        UIStoryboard mainStoryboard = [UIStoryboard storyboardWithName:@"Main" bundle:nil];
//        MainViewController *mainController = [mainStoryboard instantiateViewControllerWithIdentifier:@"MainViewController"];
        let vc = UIStoryboard(name: "Main", bundle: nil).instantiateViewController(withIdentifier: "TimeViewController")
        self.navigationController?.pushViewController(vc, animated: true)
        
    }
    
    override func tableView(_ tableView: UITableView, moveRowAt sourceIndexPath: IndexPath, to destinationIndexPath: IndexPath) {
        let tmp:String = viewmodel.Movies[sourceIndexPath.row]
        viewmodel.Movies.remove(at: sourceIndexPath.row)
        viewmodel.Movies.insert(tmp, at: destinationIndexPath.row)
        
    }
    
    override func tableView(_ tableView: UITableView, commit editingStyle: UITableViewCellEditingStyle, forRowAt indexPath: IndexPath) {
        print("\(#function)")
        if editingStyle == .delete {
                viewmodel.Movies.remove(at: indexPath.row)
                tableView.reloadData()
        }
        else if editingStyle == .insert
        {
            
            
        }
        
    }
    

    
    
    //MARK:-数据源
    override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        return viewmodel.Movies.count
    }
    override func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat {
        return 50
    }
    override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        let cell = tableView.dequeueReusableCell(withIdentifier: "cell", for: indexPath)
        
        cell.textLabel?.text = viewmodel.Movies[indexPath.row]
        cell.accessoryType = UITableViewCellAccessoryType.disclosureIndicator
        cell.selectionStyle = .none
        
        return cell
    }
    
    override func tableView(_ tableView: UITableView, canEditRowAt indexPath: IndexPath) -> Bool {
        return true
    }
    
    
    
    
    
    //MARK:-生命周期
    override func viewDidLoad() {
        super.viewDidLoad()
//        self.tableView.delegate = self
//        self.tableView.dataSource = self
        self.tableView.tableFooterView = UIView.init(frame: CGRect.zero)
        self.tableView.register(object_getClass(UITableViewCell()), forCellReuseIdentifier: "cell")
        
        
        let leftItem  = UIBarButtonItem.init(title: "Edit", style: UIBarButtonItemStyle.plain, target: self, action: #selector(Edit))
        self.navigationItem.leftBarButtonItem = leftItem
        
        let rightAddItem = UIBarButtonItem.init(barButtonSystemItem: UIBarButtonSystemItem.add, target: self, action: #selector(Add))
        self.navigationItem.rightBarButtonItem = rightAddItem
        
    }
    
    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }
    
    //MARK:-懒加载
    lazy var viewmodel: ViewModel = {
        let vm = ViewModel()
        return vm
    }()


}

SecondViewController

import UIKit

class AddViewController: UIViewController {
//闭包定义
    typealias SendBlockHandler = (_ str:String)->Void
    var sendHandlerClosuer:SendBlockHandler?
//必须要用方法承接闭包， 不能像OC一样定义完Block以后，可以直接使用这个属性 
    func sendHandler(closure:@escaping SendBlockHandler) -> Void {
        sendHandlerClosuer = closure
    }
    
    override func viewDidLoad() {
        super.viewDidLoad()
        AddTextView.becomeFirstResponder()

        // Do any additional setup after loading the view.
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }
    
    @IBOutlet weak var AddTextView: UITextView!
    @IBAction func SwipDownGesture(_ sender: Any) {
        AddTextView.resignFirstResponder()
    }
    

}

extension AddViewController:UITextViewDelegate{
//控制Return
    func textView(_ textView: UITextView, shouldChangeTextIn range: NSRange, replacementText text: String) -> Bool {
        if text == "\n" {
            
            textView.resignFirstResponder()
            self.navigationController?.popViewController(animated: true)
            sendHandlerClosuer!(textView.text)
            return false
        }
        
        
        return true
    }
    
}

在实际项目中实践，在书写记录中巩固，每日一记。

Swift学习记录 Day 4

从100 Days of Swift中学习，实践

Day 4

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