一、NSOutputStream
//创建流，append为YES的话，每次写入都是追加到文件尾部
self.outpustream = [NSOutputStream outputStreamToFileAtPath:[self getSaveFilePath] append:YES];
dispatch_async(dispatch_get_global_queue(0, 0), ^{
[self.outpustream open];
[self.outpustream write:data.bytes maxLength:data.length];
[self.outpustream close];
// [self saveFile:data];
});
二、NSFileHandle
- (void)saveFile:(NSData *)data {
//保存文件的路径
NSString *filePath = [self getSaveFilePath];
//如果文件不存在，返回的是nil
NSFileHandle *fileHandle = [NSFileHandle fileHandleForWritingAtPath:filePath];
//判断文件存不存在
if (fileHandle == nil) {
//如果文件不存在，会自动创建
[data writeToFile:filePath atomically:YES];
}else {
//让offset指向文件的末尾
[fileHandle seekToEndOfFile];
//在文件的末尾再继续写入文件
[fileHandle writeData:data];
// 同步一下防止操作混乱
[fileHandle synchronizeFile];
//关闭文件
[fileHandle closeFile];
}
}
- (NSString *)getSaveFilePath{
NSString *filePath = [[NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) lastObject] stringByAppendingPathComponent:@"video.mp4"];
if (![[NSFileManager defaultManager] fileExistsAtPath:filePath]) {
[[NSFileManager defaultManager] createFileAtPath:filePath contents:nil attributes:nil];
}
return filePath;
}
