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

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~