iOS 通过网络请求获取图片的下载歌曲

 1 @interface ViewController ()<NSURLConnectionDataDelegate>
 2 {
 3     long long alllength; //下载总长度
 4     long long currlenth; //当期下载长度
 5 }
 6 //存放下载的mp3 数据流
 7 @property(nonatomic,strong)NSMutableData *msicDate;
 8 //下载进度显示
 9 @property(nonatomic,strong)UIProgressView *msicProgress;
10 //下载按钮
11 @property(nonatomic,strong)UIButton *but;
12 //音乐播放
13 @property(nonatomic,strong)AVAudioPlayer *player;

 1 //添加下载图片地址
 2     NSString *path=@"http://pic1.nipic.com/2008-10-27/200810278105878_2.jpg";
 3     
 4     //调用下载图片方法
 5     [self addTheimg:path];
 6     
 7     //进度条设置
 8     self.msicProgress =[[UIProgressView alloc]initWithFrame:CGRectMake(60, 40, 230, 10)];
 9     self.msicProgress.progress=0;
10     //设置下载进度颜色
11     self.msicProgress.progressTintColor=[UIColor colorWithRed:0.007 green:0.868 blue:0.000 alpha:1.000];
12     //进度条背景颜色
13     self.msicProgress.trackTintColor=[UIColor grayColor];
14     
15     //下载按钮点击下载
16     self.but=[UIButton buttonWithType:UIButtonTypeCustom];
17     _but.frame=CGRectMake(140, 55, 40, 20);
18     [_but setTitleColor:[UIColor whiteColor]forState:UIControlStateNormal];
19     [_but setTitle:@"下载" forState:UIControlStateNormal];
20     _but.backgroundColor=[UIColor orangeColor];
21     [_but addTarget:self action:@selector(plarmusic:) forControlEvents:UIControlEventTouchUpInside];
22     
23     [self.view addSubview:_msicProgress];
24     [self.view addSubview:_but];

 1 //按钮点击时间相应方法
 2 -(void)plarmusic:(UIButton *)sender
 3 {
 4     //歌曲下载总的长度
 5     alllength=0;
 6     //当前获取的量
 7     currlenth = 0;
 8     self.msicDate =[[NSMutableData alloc]init];
 9     //设置歌曲下载的地址
10     NSString *path=@"http://yinyueshiting.baidu.com/data2/music/124345627/124104509190800128.mp3?xcode=cb12e87f8333e5370d9b8f0c677c76d2";
11     NSURL *url=[NSURL URLWithString:path];
12     //方式1 网络请求
13     NSURLRequest *requst=[NSURLRequest requestWithURL:url];
14     //方式2
15     //NSURLRequest *resq=[[NSURLRequest alloc]initWithURL:url cachePolicy:NSURLRequestUseProtocolCachePolicy timeoutInterval:10.0];
16     
17     //使用代理进行请求 创建连接服务器
18     [NSURLConnection connectionWithRequest:requst delegate:self];
19 }

 1 //实现网络请求代理方法
 2 -(void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response
 3 {
 4     //获取要下载的MP3 的长度，收到响应即可得知，不用下载完毕
 5     //此代理方法只执行一次,获取总的数据量
 6     alllength =[response expectedContentLength];
 7 }
 8 
 9 //获取每次下载的数据量，此方法可执行多次
10 -(void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data
11 {
12     //将每次下载的数据放入总得数据区域内
13     [self.msicDate appendData:data];
14     //将本次获取的数据长度追加到当期长度上
15     currlenth +=data.length;
16     //更新进度条
17     self.msicProgress.progress=(float)currlenth/alllength;
18 }
19 
20 //下载结束调用，播放音乐
21 -(void)connectionDidFinishLoading:(NSURLConnection *)connection
22 {
23     NSError *error=nil;
24     //下载完成后，初始化player 然后进行歌曲播放
25     self.player = [[AVAudioPlayer alloc]initWithData:self.msicDate error:&error];
26     [self.player play];
27 }
28 
29 //请求错误调用
30 -(void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error
31 {
32     if (error) {
33         NSLog(@"error == %@",error);
34     }
35 }

 1 //调用图片的方法
 2 -(void)addTheimg:(NSString *)path
 3 {
 4     // 1.通过字符串创建一个url
 5     NSString *imgstr=path;
 6     NSURL *imgurl=[NSURL URLWithString:imgstr];
 7     
 8     //2. 创建网络请求
 9     NSURLRequest *requst=[NSURLRequest requestWithURL:imgurl cachePolicy:NSURLRequestUseProtocolCachePolicy timeoutInterval:10.0];
10     
11     NSError *error=nil;
12     //3. 链接服务器
13     NSData *imgDate = [NSURLConnection sendSynchronousRequest:requst returningResponse:nil error:&error];
14     if (error)
15     {
16         //如果错误，打印错误
17         NSLog(@"%@",error);
18     }else
19     {
20         //如果找到图片，创建一个图片视图接收图片
21         UIImageView *img=[[UIImageView alloc]initWithFrame:CGRectMake(5, 20, 50, 50)];
22         img.image=[UIImage imageWithData:imgDate];
23         //将图片显示在视图
24         [self.view addSubview:img];
25     }
26 
27 }