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以存储图片为例:

1. 保存

/** *  保存用户头像 */+ (NSString *)saveUserImage:(UIImage *)image{    NSString *url;    // 获取document路径    NSArray *document = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);    NSString *path = [document objectAtIndex:0];    NSFileManager *maneger = [NSFileManager defaultManager];    NSString *documentPath = [path stringByAppendingPathComponent:@"MXUserImageFile"];    if (![maneger fileExistsAtPath:documentPath]) {        [maneger createDirectoryAtPath:documentPath withIntermediateDirectories:YES attributes:nil error:nil];    }    url = [documentPath stringByAppendingPathComponent:@"userimage.jpeg"];    NSData *imageData = UIImageJPEGRepresentation(image, 1.0);    [imageData writeToFile:url atomically:YES];    return @"Documents/MXUserImageFile/userimage.jpeg";}

2. 删除 直接调用remove方法就好了(这里就简单的写了)

[maneger removeItemAtPath:path error:nil];

3. 使用   user.avatarUrl 就是 Documents/MXUserImageFile/userimage.jpeg

NSString *path = [NSHomeDirectory() stringByAppendingPathComponent:user.avatarUrl];    [_headerImage setImage:[UIImage imageWithContentsOfFile:path]];