iOS_计算文件大小

+ (float ) folderSizeAtPath:(NSString*) folderPath{
    NSFileManager* manager = [NSFileManagerdefaultManager];
    if (![manager fileExistsAtPath:folderPath]) return 0;
    NSEnumerator *childFilesEnumerator = [[manager subpathsAtPath:folderPath] objectEnumerator];
    NSString* fileName;
    long long folderSize = 0;
    while ((fileName = [childFilesEnumerator nextObject]) != nil){
        NSString* fileAbsolutePath = [folderPath stringByAppendingPathComponent:fileName];
        folderSize += [self fileSizeAtPath:fileAbsolutePath];
    }
    return folderSize/(1024.0*1024.0);//单位为M
}
//单个文件的大小
+ (float) fileSizeAtPath:(NSString*) filePath{
    
    //
    //    NSData* data = [NSData dataWithContentsOfFile:[VoiceRecorderBaseVC getPathByFileName:_convertAmr ofType:@"amr"]];
    //    NSLog(@"amrlength = %d",data.length);
    //    NSString * amr = [NSString stringWithFormat:@"amrlength = %d",data.length];
    
    NSFileManager* manager = [NSFileManagerdefaultManager];
    
    if ([manager fileExistsAtPath:filePath]){
        
        return [[manager attributesOfItemAtPath:filePath error:nil] fileSize]/(1024.0*1024);
    }
    return 0;
 
}