保存视频

//部分代码，注意文件夹后缀加上保存文件的类型，比如mp3、mp4、（本人深有体会，因为没加后缀，搞了好长时间）

[self writeToCachePath:downloadData time:media.timeCreated];
- (void)writeToCachePath:(id)cacheData time:(NSString*)createTime {
    NSString * documentsDirectory = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0];
    createTime = [createTime stringByReplacingOccurrencesOfString:@"-" withString:@""];
    createTime = [createTime stringByReplacingOccurrencesOfString:@"/" withString:@""];
    createTime = [createTime stringByReplacingOccurrencesOfString:@" " withString:@""];
 NSString* videoCachePath = [documentsDirectory stringByAppendingPathComponent:[NSString stringWithFormat:@"videodingxu/%@.mp4",createTime]];
    [cacheData writeToFile:videoCachePath atomically:YES];
    
}

//下面这段代码是去除多余的标点符号

createTime = [createTime stringByReplacingOccurrencesOfString:@"-" withString:@""];
createTime = [createTime stringByReplacingOccurrencesOfString:@"/" withString:@""];
createTime = [createTime stringByReplacingOccurre

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