iOS 通過網路請求擷取圖片的下載歌曲

標籤：

1.匯入代理<NSURLConnectionDataDelegate>

 1 @interface ViewController ()<NSURLConnectionDataDelegate> 2 { 3     long long alllength; //下載總長度 4     long long currlenth; //當期下載長度 5 } 6 //存放下載的mp3 資料流 7 @property(nonatomic,strong)NSMutableData *msicDate; 8 //下載進度顯示 9 @property(nonatomic,strong)UIProgressView *msicProgress;10 //下載按鈕11 @property(nonatomic,strong)UIButton *but;12 //音樂播放13 @property(nonatomic,strong)AVAudioPlayer *player;

 1 //添加下載圖片地址 2     NSString *path=@"http://pic1.nipic.com/2008-10-27/200810278105878_2.jpg"; 3      4     //調用下載圖片方法 5     [self addTheimg:path]; 6      7     //進度條設定 8     self.msicProgress =[[UIProgressView alloc]initWithFrame:CGRectMake(60, 40, 230, 10)]; 9     self.msicProgress.progress=0;10     //設定下載進度顏色11     self.msicProgress.progressTintColor=[UIColor colorWithRed:0.007 green:0.868 blue:0.000 alpha:1.000];12     //進度條背景顏色13     self.msicProgress.trackTintColor=[UIColor grayColor];14     15     //下載按鈕點擊下載16     self.but=[UIButton buttonWithType:UIButtonTypeCustom];17     _but.frame=CGRectMake(140, 55, 40, 20);18     [_but setTitleColor:[UIColor whiteColor]forState:UIControlStateNormal];19     [_but setTitle:@"下載" 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];

方法的實現

 

 1 //按鈕點擊時間相應方法 2 -(void)plarmusic:(UIButton *)sender 3 { 4     //歌曲下載總的長度 5     alllength=0; 6     //當前擷取的量 7     currlenth = 0; 8     self.msicDate =[[NSMutableData alloc]init]; 9     //設定歌曲下載的地址10     NSString *path=@"http://yinyueshiting.baidu.com/data2/music/124345627/124104509190800128.mp3?xcode=cb12e87f8333e5370d9b8f0c677c76d2";11     NSURL *url=[NSURL URLWithString:path];12     //方式1 網路請求13     NSURLRequest *requst=[NSURLRequest requestWithURL:url];14     //方式215     //NSURLRequest *resq=[[NSURLRequest alloc]initWithURL:url cachePolicy:NSURLRequestUseProtocolCachePolicy timeoutInterval:10.0];16     17     //使用代理進行請求 建立串連伺服器18     [NSURLConnection connectionWithRequest:requst delegate:self];19 }

 

 1 //實現網路請求代理方法 2 -(void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response 3 { 4     //擷取要下載的MP3 的長度，收到響應即可得知，不用下載完畢 5     //此代理方法只執行一次,擷取總的資料量 6     alllength =[response expectedContentLength]; 7 } 8  9 //擷取每次下載的資料量，此方法可執行多次10 -(void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data11 {12     //將每次下載的資料放入總得資料區域內13     [self.msicDate appendData:data];14     //將本次擷取的資料長度追加到當期長度上15     currlenth +=data.length;16     //更新進度條17     self.msicProgress.progress=(float)currlenth/alllength;18 }19 20 //下載結束調用，播放音樂21 -(void)connectionDidFinishLoading:(NSURLConnection *)connection22 {23     NSError *error=nil;24     //下載完成後，初始化player 然後進行歌曲播放25     self.player = [[AVAudioPlayer alloc]initWithData:self.msicDate error:&error];26     [self.player play];27 }28 29 //請求錯誤調用30 -(void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error31 {32     if (error) {33         NSLog(@"error == %@",error);34     }35 }

 1 //調用圖片的方法 2 -(void)addTheimg:(NSString *)path 3 { 4     // 1.通過字串建立一個url 5     NSString *imgstr=path; 6     NSURL *imgurl=[NSURL URLWithString:imgstr]; 7      8     //2. 建立網路請求 9     NSURLRequest *requst=[NSURLRequest requestWithURL:imgurl cachePolicy:NSURLRequestUseProtocolCachePolicy timeoutInterval:10.0];10     11     NSError *error=nil;12     //3. 連結的伺服器13     NSData *imgDate = [NSURLConnection sendSynchronousRequest:requst returningResponse:nil error:&error];14     if (error)15     {16         //如果錯誤，列印錯誤17         NSLog(@"%@",error);18     }else19     {20         //如果找到圖片，建立一個圖片視圖接收圖片21         UIImageView *img=[[UIImageView alloc]initWithFrame:CGRectMake(5, 20, 50, 50)];22         img.image=[UIImage imageWithData:imgDate];23         //將圖片顯示在視圖24         [self.view addSubview:img];25     }26 27 }

 

iOS 通過網路請求擷取圖片的下載歌曲