从相册读取大文件dataWithContentsOfURL？

dataWithContentsOfURL: 这个方法只能读取小点的文件，如果需要读取大文件，

比如几个G的，就需要用这种方式inputStreamWithURL:.

Returns a data object containing the data from the location specified by a given URL.

Declaration

+ (instancetype)dataWithContentsOfURL:(NSURL *)url;

Parameters

aURL

The URL from which to read data.

Return Value

A data object containing the data from the location specified by aURL. Returns nil if the data object could not be created.

Discussion

Use this method to converting data:// URLs to NSData objects. You can also use it to read short files synchronously. If you need to read potentially large files, use inputStreamWithURL: to open a stream, then read the file incrementally.

If you need to know the reason for failure, use dataWithContentsOfURL:options:error:.

参考地址：https://developer.apple.com/documentation/foundation/nsdata/1547245-datawithcontentsofurl

没怎么研究视频播放器，就在网上找了个，链接：https://github.com/835239104/KrVideoPlayerPlus

下载AFNetworking,

1.下载最新版的会报错，没有引入相关库

2.AFSecurityPolicy.m中：注释了一部分代码

#pragma mark - 这里改了 －－－－－－#warning - 这里改了 －－－－－－－－//#if !TARGET_OS_IOS && !TARGET_OS_WATCH//static NSData * AFSecKeyGetData(SecKeyRef key) {//    CFDataRef data = NULL;////    __Require_noErr_Quiet(SecItemExport(key, kSecFormatUnknown, kSecItemPemArmour, NULL, &data), _out);////    return (__bridge_transfer NSData *)data;////_out://    if (data) {//        CFRelease(data);//    }////    return nil;//}//#endifstatic BOOL AFSecKeyIsEqualToKey(SecKeyRef key1, SecKeyRef key2) {//#if TARGET_OS_IOS || TARGET_OS_WATCH    return [(__bridge id)key1 isEqual:(__bridge id)key2];//#else//    return [AFSecKeyGetData(key1) isEqual:AFSecKeyGetData(key2)];//#endif}

3.实现边下边播（我用的是一边在网上看一边下载，所以会有点卡）

/** * 下载文件 */- (void)downloadFileURL:(NSString *)aUrl savePath:(NSString *)aSavePath fileName:(NSString *)aFileName tag:(NSInteger)aTag{    NSFileManager *fileManager = [NSFileManager defaultManager];    //检查本地文件是否已存在    NSString *fileName = [NSString stringWithFormat:@"%@/%@", aSavePath, aFileName];    //检查附件是否存在    if ([fileManager fileExistsAtPath:fileName]) {         [self addVideoPlayerWithURL:[NSURL fileURLWithPath:fileName]];    }else{        //创建附件存储目录        if (![fileManager fileExistsAtPath:aSavePath]) {            [fileManager createDirectoryAtPath:aSavePath withIntermediateDirectories:YES attributes:nil error:nil];        }//         [self addVideoPlayerWithURL:[NSURL fileURLWithPath:fileName]];        [self addVideoPlayerWithURL:[NSURL URLWithString:aUrl]];        //下载附件        NSURL *url = [[NSURL alloc] initWithString:aUrl];        NSURLRequest *request = [NSURLRequest requestWithURL:url];        AFHTTPRequestOperation *operation = [[AFHTTPRequestOperation alloc] initWithRequest:request];        operation.inputStream   = [NSInputStream inputStreamWithURL:url];        operation.outputStream  = [NSOutputStream outputStreamToFileAtPath:fileName append:NO];        //下载进度控制         [operation setDownloadProgressBlock:^(NSUInteger bytesRead, long long totalBytesRead, long long totalBytesExpectedToRead) {         NSLog(@"is download：%f", (float)totalBytesRead/totalBytesExpectedToRead);         }];        //已完成下载        [operation setCompletionBlockWithSuccess:^(AFHTTPRequestOperation *operation, id responseObject) {//            NSData *audioData = [NSData dataWithContentsOfFile:fileName];            NSLog(@"完成下载");            //设置下载数据到res字典对象中并用代理返回下载数据NSData        } failure:^(AFHTTPRequestOperation *operation, NSError *error) {            NSLog(@"下载失败");            //下载失败        }];        [operation start];    }}

注意：从本度读取路径：[NSURL fileURLWithPath:fileName]

在网上读取路径：[NSURL URLWithString:aUrl]

Demo百度云下载链接:http://pan.baidu.com/s/1c0bL9dQ

补充：iOS边下边播放 http://blog.csdn.net/zttjhm/article/details/38063605

iOS视频压缩：http://blog.csdn.net/lookyou111/article/details/25625775

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