在ios中的Document中创建多级文件夹以及文件

在ios中的Document中创建多级文件夹以及文件
http://yourgame.iteye.com/blog/1313044

- (NSString *)dataPath:(NSString *)file
{

    NSString *path = [[NSHomeDirectory() stringByAppendingPathComponent:@"Documents"] stringByAppendingPathComponent:@"badge"];
    BOOL bo = [[NSFileManager defaultManager] createDirectoryAtPath:path withIntermediateDirectories:YES attributes:nil error:nil];
    NSAssert(bo,@"创建目录失败");

    NSString *result = [path stringByAppendingPathComponent:file];

    return result;

}



- (void)viewDidLoad
{
    [super viewDidLoad];
    //此处首先指定了图片存取路径（默认写到应用程序沙盒 中）
    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask, YES);

    //并给文件起个文件名
    NSString *imageDir = [[[paths objectAtIndex:0] stringByAppendingPathComponent:@"163"] stringByAppendingPathComponent:@"songzi"];

    //存放图片的文件夹
    NSString *imagePath =[imageDir stringByAppendingPathComponent:@"0.png"];

    NSData *data = nil;

    //检查图片是否已经保存到本地
    if([self isExistsFile:imagePath]){
        data=[NSData dataWithContentsOfFile:imagePath];
    }else{
        data = [NSData dataWithContentsOfURL:[NSURL URLWithString: @"]];

        //创建文件夹路径
        [[NSFileManager defaultManager] createDirectoryAtPath:imageDir withIntermediateDirectories:YES attributes:nil error:nil];

        //创建图片
        [UIImagePNGRepresentation([UIImage imageWithData:data]) writeToFile:imagePath atomically:YES];
    }
    imageView.image = [UIImage imageWithData:data];
}

stringByAppendingPathComponent和stringByAppendingString的区别
http://www.cnblogs.com/ZhangYuGe/p/4425609.html

cyy:自我理解，不保证正确，但亲自试验确实可行：若用 stringByAppendingString  则需要手动在名称前加 “/”符号，而stringByAppendingPathComponent则不需要，它会自动添加

 

 

stringByAppendingPathComponent和stringByAppendingString的区别：

 

 

 NSString *imagePath = [skinPath stringByAppendingString:[NSString stringWithFormat:@"/%@",imageName]];//stringByAppendingString是在skinPath加后缀的意思
    NSString *imagePath = [skinPath stringByAppendingPathComponent:imageName];//stringByAppendingPathComponent是在skinPath后面加上“／”号连接imageName让它成为完整的路径
    NSLog(@"imagePath:%@",imagePath);