1 飞机航班查询软件
1.1 问题
NSURLConnection是IOS提供的用于处理Http协议的网络请求的类,可以实现同步请求也可以实现异步请求,本案例使用NSURLConnection类实现一个飞机航班查询的工具软件,采用GET的同步请求方式访问网络数据,如图-1所示:
图-1
1.2 方案
首先创建一个SingleViewApplication应用,在Storyboard文件中搭建查询界面,上方的三个Textfield控件分别用于接受用户输入的出发城市、到达城市和触发日期,界面中间有一个查询按钮,当用户点击该按钮则发送网络请求,根据用户输入的信息获取飞机航班信息。将三个Textfield控件分别关联成ViewController的输出口属性departCity、arriveCity、departDate。
界面的下半部分是一个TableView控件,用于展示网络返回的数据结果,将TableView控件的dataSource和delegate设置为ViewController,并关联成ViewController的输出口属性resultTV。
其次需要确定一个能够提供数据的公共网络平台,本案例使用http://webservice.webxml.com.cn网络平台,该平台能够提供多种类型的服务例如火车时刻查询、天气预报查询等。
本案例使用飞机航班查询,该服务的名称是getDomesticAirlinesTime,进入该服务界面可以看到除了提供参数使用说明还有测试窗口,如图-2所示:
图-2
这里可以使用测试功能进行测试,查看返回的XML文件的内容,出发城市输入上海,到达城市输入北京,日期输出2015-3-8,这里输入的信息必须符合参数要求不可以随意修改,如图-3所示:
图-3
点击调用按钮发出请求,可以在弹出的新页面中查看返回的XML文件的内容,如图-4所示:
图-4
然后根据应用的需要在返回的XML文件中获取需要的信息,将相关的航班信息保存在ScheduledFlight类中,该类继承至NSObject,根据所需定义如下属性:
NSString类型的属性company,记录航空公司名称;
NSString类型的属性airlineCode,记录航班号;
NSString类型的属性startDrome,记录起飞机场;
NSString类型的属性arriveDrome,记录到达机场;
NSString类型的属性startTime,记录起飞时间;
NSString类型的属性arriveTime,记录到达时间;
NSString类型的属性mode,记录飞机机型。
接下来需要创建一个Parse类型用于解析XML文件,从中获取需要的航班信息,并将信息存入ScheduledFlight类型的实例中。Parse类有一个公开的静态方法getFlightsByData:,该方法返回一个NSMutableArray类型的数组,该数组的每一个元素都是一个ScheduledFlight类型的实例,即航班信息。
然后将查询按钮关联成ViewController的动作方法search:,该方法中根据用户输入的查询条件得到NSString类型的路径path,由于含有中文因此需要进行编码,然后通过path创建NSURL对象和NSMutableURLRequest对象,最后通过NSURLConnection类的工厂方法sendSynchronousRequest:returningResponse:发送同步请求,得到返回的NSData类型的数据。
最后通过Parse类的getFlightsByData:方法解析数据得到一组航班信息,将其存放在ViewController的NSMutableArray类型的属性flights中,根据flights存放的航班数据更新表视图resultTV的显示内容。
1.3 步骤
实现此案例需要按照如下步骤进行。
步骤一:搭建查询界面
首先创建一个SingleViewApplication应用,在Storyboard文件中搭建查询界面,上方的三个Textfield控件分别用于接受用户输入的出发城市、到达城市和触发日期,界面中间有一个查询按钮,当用户点击该按钮则发送网络请求,根据用户输入的信息获取飞机航班信息。将三个Textfield控件分别关联成ViewController的输出口属性departCity、arriveCity、departDate。
界面的下半部分是一个TableView控件,用于展示网络返回的数据结果,将TableView控件的dataSource和delegate设置为ViewController,并关联成ViewController的输出口属性resultTV,代码如下所示:
- @interface ViewController ()<UITableViewDataSource,UITableViewDelegate>
- @property (weak, nonatomic) IBOutlet UITextField *departCity;
- @property (weak, nonatomic) IBOutlet UITextField *arriveCity;
- @property (weak, nonatomic) IBOutlet UITextField *departDate;
- @property (weak, nonatomic) IBOutlet UITableView *resultTV;
- @end
在Storyboard中完成的界面如图-5所示:
图-5
步骤二:创建航班类ScheduledFlight
本案例使用http://webservice.webxml.com.cn公共网络平台获取飞机航班信息,然后通过XML解析将信息展示在界面上。
首先创建一个航班类ScheduledFlight,该类继承至NSObject,根据所需定义如下公开属性:
NSString类型的属性company,记录航空公司名称;
NSString类型的属性airlineCode,记录航班号;
NSString类型的属性startDrome,记录起飞机场;
NSString类型的属性arriveDrome,记录到达机场;
NSString类型的属性startTime,记录起飞时间;
NSString类型的属性arriveTime,记录到达时间;
NSString类型的属性mode,记录飞机机型,代码如下所示:
- @interface ScheduledFlight : NSObject
- @property (nonatomic,copy) NSString *company;
- @property (nonatomic,copy) NSString *airlineCode;
- @property (nonatomic,copy) NSString *startDrome;
- @property (nonatomic,copy) NSString *arriveDrome;
- @property (nonatomic,copy) NSString *startTime;
- @property (nonatomic,copy) NSString *arriveTime;
- @property (nonatomic,copy) NSString *mode;
- @end
步骤三:创建XML解析类Parse
接下来需要创建一个Parse类型用于解析XML文件,从中获取需要的航班信息,并将信息存入ScheduledFlight类型的实例中。首先在该类中定义三个私有属性NSMutableArray类型的flights用于记录最终获得的一组航班信息,ScheduledFlight类型的currentFlight用于记录当前正在解析的航班,NSString类型的currentString用于记录当前正在读取的字符串,代码如下所示:
- @interface Parser ()<NSXMLParserDelegate>
- @property (nonatomic,strong) NSMutableArray *flights;
- @property (nonatomic,strong) ScheduledFlight *currentFlight;
- @property (nonatomic,copy) NSString *currentString;
- @end
Parse类有一个公开的静态方法getFlightsByData:,该方法返回一个NSMutableArray类型的数组,记录着最终解析出来的所有航班信息,即self.flights,代码如下所示:
- -(NSMutableArray *)getFlightsByData:(NSData *)data{
- self.flights = [NSMutableArray array];
- NSXMLParser *parser = [[NSXMLParser alloc]initWithData:data];
- parser.delegate = self;
- [parser parse];
- return self.flights;
- }
然后通过实现NSXMLParserDelegate协议中的相关方法进行XML数据解析,得到所有的航班信息,代码如下所示:
- - (void)parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName attributes:(NSDictionary *)attributeDict{
- if ([elementName isEqualToString:@"AirlinesTime"]) {
- self.currentFlight = [[ScheduledFlight alloc]init];
- }
- }
- -(void)parser:(NSXMLParser *)parser foundCharacters:(NSString *)string{
- self.currentString = string;
- }
- -(void)parser:(NSXMLParser *)parser didEndElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName{
- if ([elementName isEqualToString:@"Company"]) {
- self.currentFlight.company = self.currentString;
- }else if ([elementName isEqualToString:@"AirlineCode"]) {
- self.currentFlight.airlineCode = self.currentString;
- }else if ([elementName isEqualToString:@"StartDrome"]) {
- self.currentFlight.startDrome = self.currentString;
- }else if ([elementName isEqualToString:@"ArriveDrome"]) {
- self.currentFlight.arriveDrome = self.currentString;
- }else if ([elementName isEqualToString:@"StartTime"]) {
- self.currentFlight.startTime = self.currentString;
- }else if ([elementName isEqualToString:@"ArriveTime"]) {
- self.currentFlight.arriveTime = self.currentString;
- }else if ([elementName isEqualToString:@"Mode"]) {
- self.currentFlight.mode = self.currentString;
- }else if ([elementName isEqualToString:@"AirlinesTime"]){
- [self.flights addObject:self.currentFlight];
- }
- }
步骤四:发送网络请求,展示航班信息
首先在ViewController类中定义一个NSMutableArray类型的属性flights,用于记录需要展示的航班信息,然后实现表视图的协议方法展示数据,代码如下所示:
- - (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
- return self.flights.count;
- }
- -(CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath {
- return 100;
- }
- - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
- static NSString *identifier = @"Cell";
- UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:identifier];
- if (!cell) {
- cell = [[UITableViewCell alloc]initWithStyle:UITableViewCellStyleDefault reuseIdentifier:@"Cell"];
- }
- ScheduledFlight *flight = [self.flights objectAtIndex:indexPath.row];
- cell.textLabel.numberOfLines = 0;
- cell.textLabel.text = [NSString stringWithFormat:@"航空公司:%@\n航班号:%@\n起飞机场:%@\n到达机场:%@\n起飞时间:%@\n到达时间:%@\n机型:%@",flight.company,flight.airlineCode,flight.startDrome,flight.arriveDrome,flight.startTime,flight.arriveTime,flight.mode];
- [cell.textLabel setFont:[UIFont systemFontOfSize:10]];
- cell.backgroundColor = [UIColor clearColor];
- return cell;
- }
然后将查询按钮关联成ViewController的动作方法search:,该方法中根据用户输入的查询条件得到NSString类型的路径path,由于含有中文因此需要进行编码,然后通过path创建NSURL对象和NSMutableURLRequest对象,最后通过NSURLConnection类的工厂方法sendSynchronousRequest:returningResponse:发送同步请求,得到返回的NSData类型的数据,代码如下所示:
- - (IBAction)search:(UIButton *)sender {
- [self.departDate resignFirstResponder];
- NSString *path = [NSString stringWithFormat:@"http://webservice.webxml.com.cn/webservices/DomesticAirline.asmx/getDomesticAirlinesTime?startCity=%@&lastCity=%@&theDate=%@&userID=",self.departCity.text,self.arriveCity.text,self.departDate.text];
- path = (NSString*)CFBridgingRelease(CFURLCreateStringByAddingPercentEscapes(kCFAllocatorDefault, (CFStringRef)path, NULL, NULL, kCFStringEncodingUTF8));
- NSURL *url = [NSURL URLWithString:path];
- NSMutableURLRequest *request = [[NSMutableURLRequest alloc]initWithURL:url];
- [request setHTTPMethod:@"GET"];
- NSData *data = [NSURLConnection sendSynchronousRequest:request returningResponse:nil error:nil];
- }
最后在ViewController类中导入头文件"ScheduledFlight.h"和"Parser.h",在search:方法中通过Parse类的getFlightsByData:方法解析数据得到一组航班信息,将其存放在ViewController的NSMutableArray类型的属性flights中,根据flights存放的航班数据更新表视图resultTV的显示内容,代码如下所示:
- - (IBAction)search:(UIButton *)sender {
- [self.departDate resignFirstResponder];
- NSString *path = [NSString stringWithFormat:@"http://webservice.webxml.com.cn/webservices/DomesticAirline.asmx/getDomesticAirlinesTime?startCity=%@&lastCity=%@&theDate=%@&userID=",self.departCity.text,self.arriveCity.text,self.departDate.text];
- path = (NSString*)CFBridgingRelease(CFURLCreateStringByAddingPercentEscapes(kCFAllocatorDefault, (CFStringRef)path, NULL, NULL, kCFStringEncodingUTF8));
- NSURL *url = [NSURL URLWithString:path];
- NSMutableURLRequest *request = [[NSMutableURLRequest alloc]initWithURL:url];
- [request setHTTPMethod:@"GET"];
- NSData *data = [NSURLConnection sendSynchronousRequest:request returningResponse:nil error:nil];
- Parser *parser = [[Parser alloc]init];
- self.flights = [parser getFlightsByData:data];
- [self.resultTV reloadData];
- }
1.4 完整代码
本案例中,ViewController.m文件中的完整代码如下所示:
- #import "ViewController.h"
- #import "ScheduledFlight.h"
- #import "Parser.h"
- @interface ViewController ()<UITableViewDataSource,UITableViewDelegate>
- @property (weak, nonatomic) IBOutlet UITextField *departCity;
- @property (weak, nonatomic) IBOutlet UITextField *arriveCity;
- @property (weak, nonatomic) IBOutlet UITextField *departDate;
- @property (weak, nonatomic) IBOutlet UITableView *resultTV;
- @property (nonatomic,strong) NSMutableArray *flights;
- @end
- @implementation ViewController
- - (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
- return self.flights.count;
- }
- -(CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath {
- return 100;
- }
- - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
- static NSString *identifier = @"Cell";
- UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:identifier];
- if (!cell) {
- cell = [[UITableViewCell alloc]initWithStyle:UITableViewCellStyleDefault reuseIdentifier:@"Cell"];
- }
- ScheduledFlight *flight = [self.flights objectAtIndex:indexPath.row];
- cell.textLabel.numberOfLines = 0;
- cell.textLabel.text = [NSString stringWithFormat:@"航空公司:%@\n航班号:%@\n起飞机场:%@\n到达机场:%@\n起飞时间:%@\n到达时间:%@\n机型:%@",flight.company,flight.airlineCode,flight.startDrome,flight.arriveDrome,flight.startTime,flight.arriveTime,flight.mode];
- [cell.textLabel setFont:[UIFont systemFontOfSize:10]];
- cell.backgroundColor = [UIColor clearColor];
- return cell;
- }
- - (IBAction)search:(UIButton *)sender {
- [self.departDate resignFirstResponder];
- NSString *path = [NSString stringWithFormat:@"http://webservice.webxml.com.cn/webservices/DomesticAirline.asmx/getDomesticAirlinesTime?startCity=%@&lastCity=%@&theDate=%@&userID=",self.departCity.text,self.arriveCity.text,self.departDate.text];
- path = (NSString*)CFBridgingRelease(CFURLCreateStringByAddingPercentEscapes(kCFAllocatorDefault, (CFStringRef)path, NULL, NULL, kCFStringEncodingUTF8));
- NSURL *url = [NSURL URLWithString:path];
- NSMutableURLRequest *request = [[NSMutableURLRequest alloc]initWithURL:url];
- [request setHTTPMethod:@"GET"];
- NSData *data = [NSURLConnection sendSynchronousRequest:request returningResponse:nil error:nil];
- Parser *parser = [[Parser alloc]init];
- self.flights = [parser getFlightsByData:data];
- [self.resultTV reloadData];
- }
- @end
本案例中,ScheduledFlight.h文件中的完整代码如下所示:
- #import <Foundation/Foundation.h>
- @interface ScheduledFlight : NSObject
- @property (nonatomic,copy) NSString *company;
- @property (nonatomic,copy) NSString *airlineCode;
- @property (nonatomic,copy) NSString *startDrome;
- @property (nonatomic,copy) NSString *arriveDrome;
- @property (nonatomic,copy) NSString *startTime;
- @property (nonatomic,copy) NSString *arriveTime;
- @property (nonatomic,copy) NSString *mode;
- @end
本案例中,Parser.h文件中的完整代码如下所示:
- #import <Foundation/Foundation.h>
- #import "ScheduledFlight.h"
- @interface Parser : NSObject
- -(NSMutableArray *)getFlightsByData:(NSData *)data;
- @end
本案例中,Parser.m文件中的完整代码如下所示:
- #import "Parser.h"
- @interface Parser ()<NSXMLParserDelegate>
- @property (nonatomic,strong) NSMutableArray *flights;
- @property (nonatomic,strong) ScheduledFlight *currentFlight;
- @property (nonatomic,copy) NSString *currentString;
- @end
- @implementation Parser
- -(NSMutableArray *)getFlightsByData:(NSData *)data{
- self.flights = [NSMutableArray array];
- NSXMLParser *parser = [[NSXMLParser alloc]initWithData:data];
- parser.delegate = self;
- [parser parse];
- return self.flights;
- }
- - (void)parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName attributes:(NSDictionary *)attributeDict{
- if ([elementName isEqualToString:@"AirlinesTime"]) {
- self.currentFlight = [[ScheduledFlight alloc]init];
- }
- }
- -(void)parser:(NSXMLParser *)parser foundCharacters:(NSString *)string{
- self.currentString = string;
- }
- -(void)parser:(NSXMLParser *)parser didEndElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName{
- if ([elementName isEqualToString:@"Company"]) {
- self.currentFlight.company = self.currentString;
- }else if ([elementName isEqualToString:@"AirlineCode"]) {
- self.currentFlight.airlineCode = self.currentString;
- }else if ([elementName isEqualToString:@"StartDrome"]) {
- self.currentFlight.startDrome = self.currentString;
- }else if ([elementName isEqualToString:@"ArriveDrome"]) {
- self.currentFlight.arriveDrome = self.currentString;
- }else if ([elementName isEqualToString:@"StartTime"]) {
- self.currentFlight.startTime = self.currentString;
- }else if ([elementName isEqualToString:@"ArriveTime"]) {
- self.currentFlight.arriveTime = self.currentString;
- }else if ([elementName isEqualToString:@"Mode"]) {
- self.currentFlight.mode = self.currentString;
- }else if ([elementName isEqualToString:@"AirlinesTime"]){
- [self.flights addObject:self.currentFlight];
- }
- }
- @end
2 歌曲下载
2.1 问题
通常同步请求的用户体验不是很好,因此很多情况下会采用异步请求,异步请求是使用NSURLConnection的委托协议NSURLConnectionDelegate来实现的,本案例使用NSURLConnection类的异步请求实现网路歌曲的下载。
2.2 方案
首先创建一个SingleViewApplication应用,在ViewDidLoad方法中定义三个私有属性,NSData类型的fileData,用于存储接受文件的数据,NSString类型的fileName用于记录接受文件的名称,NSUInteger类型的length用于记录接受文件的长度。
在viewDidLoad方法中通过歌曲的网路路径path创建NSURL对象url和NSMutableURLRequest对象request,通过request创建一个NSURLConnection类型的对象connection,将delegate设置为ViewController,如果connection创建成功则表示异步请求发送成功。
当连接成功则会接收到响应,是一个NSURLResponse类型的实例response,通过response的属性allHeaderFields获取到下载文件的头文件,头文件里面包含文件的类型、长度、名称等信息。
最后通过实现NSURLConnectionDelegate协议和NSURLConnectionDataDelegate协议的相关方法接受网路数据响应,接受网络数据,完成数据下载并存入本地。
2.3 步骤
实现此案例需要按照如下步骤进行。
步骤一:创建NSURLConnection连接
首先创建一个SingleViewApplication应用,在ViewDidLoad方法中定义三个私有属性,NSData类型的fileData,用于存储接受文件的数据,NSString类型的fileName用于记录接受文件的名称,NSUInteger类型的length用于记录接受文件的长度,代码如下所示:
- @interface ViewController ()<NSURLConnectionDelegate,NSURLConnectionDataDelegate>
- @property (nonatomic, strong)NSMutableData *fileData;
- @property (nonatomic,copy)NSString *fileName;
- @property (nonatomic,assign) NSUInteger length;
- @end
在viewDidLoad方法中通过歌曲的网路路径path创建NSURL对象url和NSMutableURLRequest对象request,通过request创建一个NSURLConnection类型的对象connection,将delegate设置为ViewController,如果connection创建成功则表示异步请求发送成功,代码如下所示:
- - (void)viewDidLoad
- {
- self.fileData = [NSMutableData data];
- [super viewDidLoad];
- NSString *path = @"http://music.baidu.com/data/music/file?link=http://zhangmenshiting.baidu.com/data2/music/65371921/401533401375268461128.mp3?xcode=c318182b0f97938776659f1fd7cf3f72f84b7d701136b422";
- NSURL *url = [NSURL URLWithString:path];
- NSMutableURLRequest *request = [[NSMutableURLRequest alloc]initWithURL:url];
- NSURLConnection *connection = [[NSURLConnection alloc]initWithRequest:request delegate:self];
- if (connection) {
- NSLog(@"连接成功");
- }
- }
步骤二:实现协议方法,完成数据下载
当连接成功则会接收到响应,是一个NSURLResponse类型的实例response,通过response的属性allHeaderFields获取到下载文件的头文件,头文件里面包含文件的类型、长度、名称等信息。
最后通过实现NSURLConnectionDelegate协议和NSURLConnectionDataDelegate协议的相关方法接受网路数据响应,接受网络数据,完成数据下载并存入本地,代码如下所示:
- - (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response{
- NSLog(@"接收到响应!!");
- NSHTTPURLResponse *resp = (NSHTTPURLResponse*)response;
- NSDictionary *dic = resp.allHeaderFields;
- NSLog(@"%@",dic);
- self.length = [[dic objectForKey:@"Content-Length"] intValue];
- self.fileName = [dic objectForKey:@"Content-Disposition"];
- NSLog(@"length:%lu,filename:%@",self.length,self.fileName);
- }
- -(void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data{
- NSLog(@"data length = %lu",(unsigned long)data.length);
- [self.fileData appendData:data];
- }
- -(void)connectionDidFinishLoading:(NSURLConnection *)connection{
- NSFileManager *fm = [NSFileManager defaultManager];
- NSString *filePath = @"/Users/Vivian/Desktop/songs";
- [fm createDirectoryAtPath:filePath withIntermediateDirectories:YES attributes:nil error:nil];
- [self.fileData writeToFile:[filePath stringByAppendingPathComponent:self.fileName] atomically:YES];
- NSLog(@"完成");
- }
- -(void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error{
- NSLog(@"error");
- }
2.4 完整代码
本案例中,ViewController.m文件中的完整代码如下所示:
- #import "ViewController.h"
- @interface ViewController ()<NSURLConnectionDelegate,NSURLConnectionDataDelegate>
- @property (nonatomic, strong)NSMutableData *fileData;
- @property (nonatomic,copy)NSString *fileName;
- @property (nonatomic,assign) NSUInteger length;
- @end
- @implementation ViewController
- - (void)viewDidLoad
- {
- self.fileData = [NSMutableData data];
- [super viewDidLoad];
- NSString *path = @"http://music.baidu.com/data/music/file?link=http://zhangmenshiting.baidu.com/data2/music/65371921/401533401375268461128.mp3?xcode=c318182b0f97938776659f1fd7cf3f72f84b7d701136b422";
- NSURL *url = [NSURL URLWithString:path];
- NSMutableURLRequest *request = [[NSMutableURLRequest alloc]initWithURL:url];
- NSURLConnection *connection = [[NSURLConnection alloc]initWithRequest:request delegate:self];
- if (connection) {
- NSLog(@"连接成功");
- }
- }
- - (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response{
- NSLog(@"接收到响应!!");
- NSHTTPURLResponse *resp = (NSHTTPURLResponse*)response;
- NSDictionary *dic = resp.allHeaderFields;
- NSLog(@"%@",dic);
- self.length = [[dic objectForKey:@"Content-Length"] intValue];
- self.fileName = [dic objectForKey:@"Content-Disposition"];
- NSLog(@"length:%lu,filename:%@",self.length,self.fileName);
- }
- -(void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data{
- NSLog(@"data length = %lu",(unsigned long)data.length);
- [self.fileData appendData:data];
- }
- -(void)connectionDidFinishLoading:(NSURLConnection *)connection{
- NSFileManager *fm = [NSFileManager defaultManager];
- NSString *filePath = @"/Users/Vivian/Desktop/songs";
- [fm createDirectoryAtPath:filePath withIntermediateDirectories:YES attributes:nil error:nil];
- [self.fileData writeToFile:[filePath stringByAppendingPathComponent:self.fileName] atomically:YES];
- NSLog(@"完成");
- }
- -(void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error{
- NSLog(@"error");
- }
- @end