iOS RxSwift、RxCocoa的应用

1、pod 引入所需的库

	pod 'Cartography'   # swift 布局
 	pod 'RxSwift'          
  	pod 'RxCocoa'		  
	pod 'HandyJSON', '5.0.0-beta'

升级xcode到10.2之后，swift编译版本为5.0。
在引入HandyJSON 的时候，默认是4.2.1版本，报错了：Undefined symbols for architecture x86_64:
“_swift_getFieldAt”。解决办法是使用5.0.0-beta版本就可以了。

2、新建viewcontroller、viewmodel和model，代码如下：

view controller: 里边新建一个tableview，然后和viewmodel的dataSourceObservable和tableview绑定。

import UIKit
import Cartography

class MVVMViewController: UIViewController {

    let viewModel = MVVMViewModel() // view 层持有 viewModel
    let tableView = UITableView()
    
    override func viewDidLoad() {
        super.viewDidLoad()
        self.navigationItem.title = "天行数据"
        view.addSubview(tableView)
        tableView.rowHeight = UITableView.automaticDimension
        tableView.estimatedRowHeight = 112
        tableView.register(MVVMTableViewCell.self, forCellReuseIdentifier: "cell")
        constrain(view, tableView) { (view, tableView) in
            tableView.edges == view.edges
        }
        

        viewModel.dataSourceObservable.bind(to: tableView.rx.items(cellIdentifier: "cell")) {
            (_ , dd, cell) in
            let cell = cell as! MVVMTableViewCell
            cell.configData(model: dd)
        }.disposed(by: viewModel.disposeBag)

    }
}

viewmodel init方法里用URLSession.shared.rx.json生成一个Observable 对象，数据使用 天行数据 的api 接口，并把json使用HandyJSON转换为模型。

import UIKit
import RxSwift
import HandyJSON

class MVVMViewModel {
    
    let dataSourceObservable :Observable<[MVVMModel]>
    
    let disposeBag = DisposeBag()
    
    init() {
        
        let urlStr = "https://api.tianapi.com/meinv/?key=20dd4620e06b0e108d3e081bb981f710&num=20"
        let url = URL(string: urlStr)
        let request = URLRequest(url: url!)
        
        dataSourceObservable = URLSession.shared.rx.json(request: request).map { (result) -> [MVVMModel] in
            if let data = result as? [String: Any],
                let channels = data["newslist"] as? [[String: Any]] {
                let tmparr = [MVVMModel].deserialize(from: channels)
                return tmparr as! [MVVMModel]
            }else {
                return []
            }
        }
        
    }
    
    
    
}

cell 使用Cartography 进行布局

import UIKit
import Cartography


class MVVMTableViewCell: UITableViewCell {
    
    let img = UIImageView()
    let titleLabel = UILabel()
    let subtitleLabel = UILabel()
    let timeLabel = UILabel()
    
    override init(style: UITableViewCell.CellStyle, reuseIdentifier: String?) {
        super.init(style: style, reuseIdentifier: reuseIdentifier)
        contentView.addSubview(img)
        contentView.addSubview(titleLabel)
        contentView.addSubview(subtitleLabel)
        contentView.addSubview(timeLabel)
        
        img.contentMode = UIView.ContentMode.scaleAspectFit
        
        constrain(contentView,img) { (contentView, img) in
            img.left == contentView.left + 16
            img.top == contentView.top + 16
            img.width == 80
            img.height == 80
            
        }
        
        constrain(contentView, titleLabel, img) { (contentView,titleLabel,img) in
            titleLabel.left == img.right + 8
            titleLabel.top == img.top
            titleLabel.width == UIScreen.main.bounds.size.width - 120
        }
        
        constrain(subtitleLabel, titleLabel) { (subtitleLabel,titleLabel) in
            subtitleLabel.left == titleLabel.left
            subtitleLabel.top == titleLabel.bottom + 8
            subtitleLabel.width == titleLabel.width
        }
        
        constrain(img,timeLabel,titleLabel,contentView) { (img,timeLabel,titleLabel,contentView) in
            timeLabel.left == titleLabel.left
            timeLabel.bottom == img.bottom
            timeLabel.width == titleLabel.width
            timeLabel.bottom == contentView.bottom - 16
        }
        
    }
    
    required init?(coder aDecoder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
    
    override func awakeFromNib() {
        super.awakeFromNib()
        // Initialization code
    }

    override func setSelected(_ selected: Bool, animated: Bool) {
        super.setSelected(selected, animated: animated)

        // Configure the view for the selected state
    }
    
    func configData(model: MVVMModel) {
        img.setImageWith(URL(string: model.picUrl!), placeholder: nil)
        titleLabel.text = model.title
        timeLabel.text = model.ctime
        subtitleLabel.text = model.description
    }

}

model 比较简单

import UIKit
import HandyJSON

class MVVMModel : HandyJSON {
    let title: String? = nil
    let ctime: String? = nil
    let picUrl: String? = nil
    let url: String? = nil
    let description: String? = nil;
    
    required init() {}
 
}

效果如图

源码地址：https://github.com/hxcshr/awesome_ios_test