iOS 本機存放區之沙箱(Document)

以儲存圖片為例: 1. 儲存

/** *  儲存帳戶圖片 */+ (NSString *)saveUserImage:(UIImage *)image{    NSString *url;    // 擷取document路徑    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. 刪除 直接調用remove方法就好了(這裡就簡單的寫了)

[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]];

注意:使用document儲存是不要存絕對路徑,因為應用在沙箱中的名字是會變的.