加载保存的图像

Question

我开发了一个应用程序，我可以在其中应用查找过滤器。现在我想创建一个撤销按钮，它将重置原始图像，该图像是在imageView中加载图像后保存的。我有这段代码：

- (IBAction)undo:(id)sender
{
    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,
                                                         NSUserDomainMask, YES);
    NSString *documentsDirectory = [paths objectAtIndex:0];
    NSString* path = [documentsDirectory stringByAppendingPathComponent:
                      @"test.png" ];
    UIImage* image = [UIImage imageWithContentsOfFile:path];
    [self->imgView setImage:image];
}




- (void)saveImage: (UIImage*)image
{
    if (image != nil)
    {
        NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,
                                                             NSUserDomainMask, YES);
        NSString *documentsDirectory = [paths objectAtIndex:0];
        NSString* path = [documentsDirectory stringByAppendingPathComponent:
                          @"test.png" ];
        NSData* data = UIImagePNGRepresentation(image);
        [data writeToFile:path atomically:YES];
    }
}

但是当我按下撤销按钮时，imageView将被关闭。

我希望有人可以帮助我。

Answer 1

尝试使用

[self.imgView setImage:image];

而不是

[self->imgView setImage:image];