iOS 文件下载,ios文件下充斥

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iOS 文件下载,ios文件下充斥

iOS 视频音乐类相当使用会因此到“文件下充斥”。文件下充斥于iOS中的贯彻如下:

imgs/asCode/09145833_ddKX.jpg

1、小文件下充斥

@interface ViewController () <NSURLConnectionDataDelegate>

@property (weak, nonatomic) IBOutlet UIProgressView *progressView;
/** 文件数据 */
@property (nonatomic, strong) NSMutableData *fileData;
/** 文件的总长度 */
@property (nonatomic, assign) NSInteger contentLength;
@end

 

- (void)viewDidLoad {
    [super viewDidLoad];
    NSURL *url = [NSURL URLWithString:@"http://120.25.226.186:32812/resources/videos/minion_15.mp4"];
    [NSURLConnection connectionWithRequest:[NSURLRequest requestWithURL:url] delegate:self];
}

#pragma mark - <NSURLConnectionDataDelegate>
- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSHTTPURLResponse *)response
{
    self.contentLength = [response.allHeaderFields[@"Content-Length"] integerValue];
    self.fileData = [NSMutableData data];
}

- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data
{
    [self.fileData appendData:data];
    CGFloat progress = 1.0 * self.fileData.length / self.contentLength;
    NSLog(@"已下载:%.2f%%", (progress) * 100);
    self.progressView.progress = progress;
}

- (void)connectionDidFinishLoading:(NSURLConnection *)connection
{
    NSLog(@"下载完毕");

    // 将文件写入沙盒中

    // 缓存文件夹
    NSString *caches = [NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES) lastObject];

    // 文件路径
    NSString *file = [caches stringByAppendingPathComponent:@"minion_15.mp4"];

    // 写入数据
    [self.fileData writeToFile:file atomically:YES];
    self.fileData = nil;
}

 

2、大文件下充斥

#define XMGFile [[NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES) lastObject] stringByAppendingPathComponent:@"minion_15.mp4"]

@interface ViewController () <NSURLConnectionDataDelegate>
@property (weak, nonatomic) IBOutlet UIProgressView *progressView;
/** 文件的总长度 */
@property (nonatomic, assign) NSInteger contentLength;
/** 当前下载的总长度 */
@property (nonatomic, assign) NSInteger currentLength;

/** 文件句柄对象 */
@property (nonatomic, strong) NSFileHandle *handle;

@end

 

- (void)viewDidLoad {
    [super viewDidLoad];

    NSURL *url = [NSURL URLWithString:@"http://120.25.226.186:32812/resources/videos/minion_15.mp4"];
    [NSURLConnection connectionWithRequest:[NSURLRequest requestWithURL:url] delegate:self];
}

 

#pragma mark - <NSURLConnectionDataDelegate>
/**
 * 接收到响应的时候:创建一个空的文件
 */
- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSHTTPURLResponse *)response
{
    // 获得文件的总长度
    self.contentLength = [response.allHeaderFields[@"Content-Length"] integerValue];

    // 创建一个空的文件
    [[NSFileManager defaultManager] createFileAtPath:XMGFile contents:nil attributes:nil];

    // 创建文件句柄
    self.handle = [NSFileHandle fileHandleForWritingAtPath:XMGFile];
}

/**
 * 接收到具体数据:马上把数据写入一开始创建好的文件
 */
- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data
{

    // 指定数据的写入位置 -- 文件内容的最后面
    [self.handle seekToEndOfFile];

    // 写入数据
    [self.handle writeData:data];

    // 拼接总长度
    self.currentLength += data.length;

    // 进度
    self.progressView.progress = 1.0 * self.currentLength / self.contentLength;
}

- (void)connectionDidFinishLoading:(NSURLConnection *)connection
{
    // 关闭handle
    [self.handle closeFile];
    self.handle = nil;

    // 清空长度
    self.currentLength = 0;
}

 

http://www.bkjia.com/IOSjc/1137744.htmlwww.bkjia.comtruehttp://www.bkjia.com/IOSjc/1137744.htmlTechArticleiOS 文件下载,ios文件下充斥 iOS
视频音乐类等下会因此到文件下充斥。文件下充斥于iOS中之兑现如下:
1、小文件下充斥 @interface ViewController () NSUR…

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