iOS项目之Swift新闻App(二)—网络数据请求和添加TableHeader

来源：互联网发布：龙岗网络推广szaow 编辑：程序博客网时间：2024/05/16 09:16

1.通过对知乎日报头条的url进行Json解析，并使用代理将网络请求之后的数据传回到ViewController当中。在这里利用了Swift中使用很多Alamofire网络库，可以直接在Cocoapod中进行安装下载。在该工程项目下建一个Podfile文件，里面添加如下所示命令。

platform :ios,'8.0'

use_frameworks!

pod 'Alamofire', '~>3.0'

    func alamofireRequest(url: String){        var model: NewsCellModel?        Alamofire.request(.GET, url, parameters: ["foo": "bar"])            .responseJSON { response in                if let JSON = response.result.value {                    if let json = JSON.objectForKey("stories"){                        for var i = 0; i<json.count; i = i + 1{                            let str1 = json[i].objectForKey("id")as! Int                            //注意images格式，字符串数组                            let str2 = json[i].objectForKey("images")![0]as! String                            let str3 = json[i].objectForKey("title")as! String//                            print(str1)//                            print(str2)//                            print(str3)                            model = NewsCellModel(id: str1, newsImageName: str2, newsTitle: str3)                            self.item.append(model!)                        }                    }                    if let json = JSON.objectForKey("top_stories"){                        for var i = 0; i<json.count; i = i + 1{                            let str1 = json[i].objectForKey("id")as! Int                            //注意images格式，字符串数组                            let str2 = json[i].objectForKey("image")as! String                            let str3 = json[i].objectForKey("title")as! String//                                                        print(str1)//                                                        print(str2)//                                                        print(str3)                            model = NewsCellModel(id: str1, newsImageName: str2, newsTitle: str3)                            self.item.append(model!)                        }                                            }                    //调用代理方法                    self.delegate?.transforValue(self.item)                }        }    }

2.添加头条新闻

在TableView视图上面有一个TableHeader视图，可以将头条新闻展示在TableHeader位置。

    /**     Description:加载TableHeader视图     */    func loadHeaderView(){        headerView = UIView(frame: CGRectMake(0,0,width,height/3))        self.tableView.tableHeaderView = headerView                scrollView = UIScrollView(frame: CGRectMake(0,0,width,height/3))        //        scrollView.backgroundColor = UIColor.redColor()        //一定要加上scrollView的代理，不然不能进行回调        scrollView.delegate = self        scrollView.contentSize = CGSize(width: width*7, height: height/3)        //按页移动        scrollView.pagingEnabled = true        scrollView.bounces = true        //不显示水平移动的标记        scrollView.showsHorizontalScrollIndicator = false        headerView.addSubview(scrollView)        //button的width要注意width*7        button = UIButton(frame: CGRectMake(0,0,width*7,height/3))        button.addTarget(self, action: "jumpNext", forControlEvents: UIControlEvents.TouchUpInside)        scrollView.addSubview(button)                pageControl = UIPageControl(frame: CGRectMake(width/3,height/3.5,width/2,23))        pageControl.numberOfPages = 5        pageControl.pageIndicatorTintColor = UIColor.yellowColor()        pageControl.currentPageIndicatorTintColor = UIColor.redColor()        headerView.addSubview(pageControl)                        for i in 1...self.items2.count{            let model = self.items2[i - 1]            let imageView = UIImageView(image: UIImage(data: NSData(contentsOfURL: NSURL(string: model.newsImageName)!)!))            imageView.frame = CGRectMake(width*CGFloat(i), 0, width, height/3)            scrollView.addSubview(imageView)                        let label = UILabel(frame: CGRectMake(100 + CGFloat(i) * width,100,width/2,height/9))            label.text = model.newsTitle            label.textColor = UIColor.whiteColor()            label.shadowColor = UIColor.blackColor()            label.numberOfLines = 3            scrollView.addSubview(label)        }        //添加第一页和最后一页        let imageView1 = UIImageView(image: UIImage(data: NSData(contentsOfURL: NSURL(string: self.items2.last!.newsImageName)!)!))        let label1 = UILabel(frame: CGRectMake(100 + CGFloat(0) * width,100,width/2,height/9))        label1.text = self.items2[4].newsTitle        label1.textColor = UIColor.whiteColor()        label1.shadowColor = UIColor.blackColor()        label1.numberOfLines = 3        imageView1.frame = CGRectMake(width*CGFloat(0), 0, width, height/3)                let imageView2 = UIImageView(image: UIImage(data: NSData(contentsOfURL: NSURL(string: self.items2.first!.newsImageName)!)!))        let label2 = UILabel(frame: CGRectMake(100 + CGFloat(6) * width,100,width/2,height/9))        label2.text = self.items2[0].newsTitle        label2.textColor = UIColor.whiteColor()        label2.shadowColor = UIColor.blackColor()        label2.numberOfLines = 3        imageView2.frame = CGRectMake(width*CGFloat(6), 0, width, height/3)                scrollView.addSubview(imageView1)        scrollView.addSubview(label1)        scrollView.addSubview(imageView2)        scrollView.addSubview(label2)            }

3.具体代码请见我的Github ，欢迎star~

0 0