Swift实现糗事百科Demo（实战项目）

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mob6047570191d0 2015-10-09 11:23:00

文章标签 ide json 数据网络请求 bundle 文章分类 代码人生

在这里，你将会学习到解析JSON数据，网络请求功能，动态调整cell内容等功能！！！

Swift实现糗事百科Demo（实战项目）_网络请求

最终的结果是这样的，项目相对简单，很适合入门！下面让我们一起开始教程之旅吧！

1、先看下项目工程结构：

Swift实现糗事百科Demo（实战项目）_ide_02

第一步：创建Utitlities文件夹，先完成基础通用的辅助功能

1、网络请求类：HttpRequest.swift

[objc] view plain copy print ?

import Foundation
///
/// @brief 网络请求相关类
/// @date 2014-10-09
/// @author huangyibiao
///
class HttpRequest: NSObject {
override init() {
super.init()
}
///
/// @brief 把二进制数据转换成JSON格式的数据
/// @param data NSDictionary?类型，网络请求返回来的二进制数据
/// @return 如果解析成功，返回NSDictionary?类型的JSON数据；如果解析失败，会返回nil
///
class func parseJSONData(data: AnyObject?) ->NSDictionary? {
if let downloadData: NSData = data as? NSData {
var jsonData: AnyObject? = NSJSONSerialization.JSONObjectWithData(downloadData,
options: NSJSONReadingOptions.MutableContainers,
error: nil) as? NSDictionary
return jsonData as? NSDictionary
}
// 当解析失败时，会返回nil
return nil
}
///
/// @brief 异步网络请求方法，需要请求地址参数及回调
/// @param urlString 请求地址
/// @param completion 请求完成或者请求失败的回调
/// @return 请求成功时，会返回NSDictionary?的字典格式的数据，如果请求失败，会返回nil
///
class func request(#urlString: String?, completion: (data: NSDictionary?) ->Void) {
if urlString == nil {
dispatch_async(dispatch_get_main_queue(), { () -> Void in
println("urlstring 为空")
// 请求出现，则返回nil对象表示
completion(data: nil)
})
return
}
let url = NSURL.URLWithString(urlString!)
let request = NSURLRequest(URL: url)
let queue = NSOperationQueue()
NSURLConnection.sendAsynchronousRequest(request, queue: queue) {
(response, data, error) -> Void in
if error != nil {
dispatch_async(dispatch_get_main_queue(), { () -> Void in
println(error)
// 请求出现，则返回nil对象表示
completion(data: nil)
})
} else { // 请求成功，则返回正确的数据
let parseData = self.parseJSONData(data)
dispatch_async(dispatch_get_main_queue(), { () -> Void in
completion(data: parseData)
})
}
}
}
}

2、对String的扩展:

[objc] view plain copy print ?

import Foundation
import UIKit
///
/// @brief String的通用扩展方法
/// @date 2014-10-09
/// @author huangyibiao
///
extension String {
///
/// @brief 获取字符串的高度
/// @param fontSize 字体大小
/// @param width 限制一行显示的宽度
/// @return 返回文本在width宽度的条件下的总高度
///
func height(let fontSize: CGFloat, let width: CGFloat) ->CGFloat {
let font = UIFont.systemFontOfSize(fontSize)
let size = CGSizeMake(width, CGFloat.max)
var style = NSMutableParagraphStyle()
style.lineBreakMode = NSLineBreakMode.ByCharWrapping
var attributes = [NSFontAttributeName: font, NSParagraphStyleAttributeName: style.copy()];
// 强转成NSString
var text = self as NSString
var rect = text.boundingRectWithSize(size,
options: NSStringDrawingOptions.UsesLineFragmentOrigin,
attributes: attributes,
context: nil)
return rect.size.height
}
///
/// @brief 把时间戳转换成“2014年12月12日 8:20:20”格式的日期字符串
/// @param timeStamp 时间戳
/// @return “2014年12月12日 8:20:20”格式的日期字符串
///
func dateStringFromTimeStamp(let timeStamp: NSString) ->String {
var formatter = NSDateFormatter()
formatter.dateFormat = "yyyy年MM月dd日 HH:MM:ss"
let date = NSDate(timeIntervalSince1970: timeStamp.doubleValue)
return formatter.stringFromDate(date)
}
}

3、UIView扩展：

[objc] view plain copy print ?

import Foundation
import UIKit
///
/// @brief UIView的扩展方法，方便工程全局使用扩展方法来创建或者使用所有继承于UIView的控件
/// @date 2014-10-09
/// @author huangyibiao
///
extension UIView {
///
/// 获取或设置origin.x
///
func originX() ->CGFloat {
return self.frame.origin.x
}
func originX(let originX: CGFloat) {
var rect = self.frame
rect.origin.x = originX
self.frame = rect
}
///
/// 获取或设置origin.y
///
func originY() ->CGFloat {
return self.frame.origin.y
}
func originY(let originY: CGFloat) {
var rect = self.frame
rect.origin.y = originY
self.frame = rect
}
///
/// 获取或设置origin
///
func origin() ->CGPoint {
return self.frame.origin
}
func origin(let origin: CGPoint) {
var rect = self.frame
rect.origin = origin
self.frame = rect
}
///
/// 获取或设置width
///
func width() ->CGFloat {
return self.frame.size.width
}
func width(let width: CGFloat) {
var rect = self.frame
rect.size.width = width
self.frame = rect
}
///
/// 获取或设置height
///
func height() ->CGFloat {
return self.frame.size.height
}
func height(let height: CGFloat) {
var rect = self.frame
rect.size.height = height
self.frame = rect
}
///
/// 获取rightX
///
func rightX() ->CGFloat {
return originX() + width()
}
///
/// 获取或设置bottomY
///
func bottomY() ->CGFloat {
return originY() + height()
}
func bottomY(let bottomY: CGFloat) {
var rect = self.frame
rect.origin.y = bottomY - height()
self.frame = rect
}
}

第二步：分析好项目的特性，这几个显示的内容格式很像，因此这里使用了同一个基类，这也需要我们先封装一个基类：

BaseRefreshController

[objc] view plain copy print ?

///
/// @brief 由HotController、LatestController、TruthController继承，用于
/// 统一管理数据显示
/// @data 2014-10-09
/// @author huangyibiao
class BaseRefreshController: UIViewController,
UITableViewDataSource,
UITableViewDelegate,
RefreshViewDelegate,
JokerCellDelegate {
var refreshView: RefreshView?
var dataSource = NSMutableArray()
var tableView: UITableView?
var currentPage: Int = 1
var cellIdentifier = "JokerCellIdentifier"
override func viewDidLoad() {
super.viewDidLoad()
self.automaticallyAdjustsScrollViewInsets = false;
self.view.backgroundColor = UIColor.whiteColor()
// table view
self.tableView = UITableView(frame: CGRectMake(0, 64, self.view.width(), kScreenHeight - 49 - 64))
self.tableView?.dataSource = self
self.tableView?.delegate = self
self.tableView?.separatorStyle = UITableViewCellSeparatorStyle.None
self.view.addSubview(self.tableView!)
var nib = UINib(nibName: "JokerCell", bundle: nil)
self.tableView!.registerNib(nib, forCellReuseIdentifier: cellIdentifier)
// refresh view
var array = NSBundle.mainBundle().loadNibNamed("RefreshView", owner: self, options: nil) as Array
self.refreshView = array[0] as? RefreshView
self.tableView!.tableFooterView = self.refreshView
self.refreshView!.delegate = self
}
///
/// @brief 加载更多数据，此方法由子类调用
/// @param urlString 请求地址，其中不指定page值
func downloadData(#urlString: String) {
let url = "\(urlString)\(self.currentPage)"
self.refreshView!.startLoadingMore()
HttpRequest.request(urlString: url) { (data) -> Void in
if data == nil {
UIAlertView.show(title: "温馨提示", message: "加载失败!")
} else {
var itemArray = data?["items"] as NSArray
for item: AnyObject in itemArray {
self.dataSource.addObject(item)
}
self.tableView!.reloadData()
self.refreshView!.stopLoadingMore()
self.currentPage++
}
}
}
///
/// UITableViewDataSource
///
func numberOfSectionsInTableView(tableView: UITableView) -> Int {
return 1
}
func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return self.dataSource.count
}
func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
var cell = tableView.dequeueReusableCellWithIdentifier(self.cellIdentifier, forIndexPath: indexPath) as? JokerCell
cell?.delegate = self
if indexPath.row < self.dataSource.count {
var dataDict = self.dataSource[indexPath.row] as NSDictionary
cell?.data = dataDict
}
return cell!
}
///
/// UITableViewDelegate
///
func tableView(tableView: UITableView!, heightForRowAtIndexPath indexPath: NSIndexPath!) -> CGFloat {
var index = indexPath.row
var data = self.dataSource[index] as NSDictionary
return JokerCell.cellHeight(data)
}
func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
var index = indexPath.row
var data = self.dataSource[index] as NSDictionary
let comment = CommentController()
comment.jokeId = data["id"] as? String
self.navigationController?.pushViewController(comment, animated: true)
}
///
/// JokerCellDelegate 代理方法实现
///
func jokerCell(cell: JokerCell, didClickPicture picutre: String) {
let browser = PhotoBrowserController()
browser.bigImageUrlString = picutre
self.navigationController?.pushViewController(browser, animated: true)
}
}

如果使用的cell不一样，那么子类需要重写对应的代理方法，像查看评论这个就需要重写：

CommentController:

[objc] view plain copy print ?

import UIKit
///
/// @brief 查看评价信息
/// @data 2014-10-09
/// @author huangyibiao
class CommentController: BaseRefreshController {
// 不可空
var jokeId: String?
override func viewDidLoad() {
super.viewDidLoad()
self.title = "评论"
var nib = UINib(nibName: "CommentCell", bundle: nil)
self.tableView!.registerNib(nib, forCellReuseIdentifier: "CommentCellIdentifier")
self.tableView!.height(kScreenHeight - 64)
}
override func viewWillAppear(animated: Bool) {
super.viewWillAppear(animated)
if let root = self.tabBarController as? RootTabBarController {
root.tabBarView?.hidden = true
}
if self.jokeId != nil {
downloadData(urlString: "http://m2.qiushibaike.com/article/\(self.jokeId!)/comments?count=20&page=")
}
}
override func viewWillDisappear(animated: Bool) {
super.viewWillDisappear(animated)
if let root = self.tabBarController as? RootTabBarController {
root.tabBarView?.hidden = false
}
}
///
/// RefreshViewDelegate
func refresh(refreshView: RefreshView, didClickButton button: UIButton) {
if self.jokeId != nil {
downloadData(urlString: "http://m2.qiushibaike.com/article/\(self.jokeId!)/comments?count=20&page=")
}
}
///
/// UITableViewDataSource
///
override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
var cell = tableView.dequeueReusableCellWithIdentifier("CommentCellIdentifier", forIndexPath: indexPath) as? CommentCell
if indexPath.row < self.dataSource.count {
var dataDict = self.dataSource[indexPath.row] as NSDictionary
cell?.data = dataDict
}
return cell!
}
///
/// UITableViewDelegate
///
override func tableView(tableView: UITableView!, heightForRowAtIndexPath indexPath: NSIndexPath!) -> CGFloat {
var index = indexPath.row
var data = self.dataSource[index] as NSDictionary
return CommentCell.cellHeight(data)
}
override func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
// 重写而已，以防调用父类的方法
}
}

这样封装好以后，下面的最新、热门、真相这三个模块就很简化了：

[objc] view plain copy print ?

import Foundation
import UIKit
///
/// @brief 热门模块视图控制器
/// @author huangyibiao
class HotController: BaseRefreshController {
///
/// @brief 生命周期函数
///
override func viewDidLoad() {
super.viewDidLoad()
self.title = "热门";
downloadData(urlString: "http://m2.qiushibaike.com/article/list/suggest?count=20&page=")
}
///
/// RefreshViewDelegate
func refresh(refreshView: RefreshView, didClickButton button: UIButton) {
downloadData(urlString: "http://m2.qiushibaike.com/article/list/suggest?count=20&page=")
}
}

[objc] view plain copy print ?

import Foundation
import UIKit
///
/// @brief 最新模块视图控制器
/// @author huangyibiao
class LatestController: BaseRefreshController {
///
/// @brief 生命周期函数
///
override func viewDidLoad() {
super.viewDidLoad()
self.title = "最新";
downloadData(urlString: "http://m2.qiushibaike.com/article/list/latest?count=20&page=")
}
///
/// RefreshViewDelegate
func refresh(refreshView: RefreshView, didClickButton button: UIButton) {
downloadData(urlString: "http://m2.qiushibaike.com/article/list/latest?count=20&page=")
}
}

[objc] view plain copy print ?

import Foundation
import UIKit
///
/// @brief 真相模块视图控制器
/// @author huangyibiao
class TruthController: BaseRefreshController {
///
/// @brief 生命周期函数
///
override func viewDidLoad() {
super.viewDidLoad()
self.title = "真相";
downloadData(urlString: "http://m2.qiushibaike.com/article/list/imgrank?count=20&page=")
}
///
/// RefreshViewDelegate
func refresh(refreshView: RefreshView, didClickButton button: UIButton) {
downloadData(urlString: "http://m2.qiushibaike.com/article/list/imgrank?count=20&page=")
}
}