IKImageView和滚动条 [英] IKImageView and scroll bars

问题描述

我正在尝试使用apple提供的IKImageViewDemo（ http ：//developer.apple.com/mac/library/samplecode/IKImageViewDemo/index.html ）我正在尝试向其中添加滚动条。我尝试了两件事：

I'm trying to use the IKImageViewDemo provided by apple (http://developer.apple.com/mac/library/samplecode/IKImageViewDemo/index.html) and I'm trying to add scrollbars to it. I've tried two things:

1）将IKImageView嵌入ScrollView中。这有各种奇怪的效果，比如图像不再位于应有的位置，并且滚动条似乎在一个固定的位置，无论窗口有多大（所以我可以缩小窗口并丢失滚动条，即使scrollview设置为使用窗口调整大小）

1) embedding the IKImageView in a ScrollView. This had all sorts of weird effects, like the image was no longer located where it should have been, and the scrollbars seemed to be in a fixed place, no matter how big the window was (So I could shrink the window and lose the scrollbars, even though the scrollview was set to resize with the window)

2）我将[_imageView setHasHorizo​​ntalScrollers：YES]（和垂直）添加到openImageURL方法的代码中。这似乎什么也没做。

2) I added [_imageView setHasHorizontalScrollers: YES] (and vertical) into the code in the openImageURL method. This appears to have done nothing.

我错过了一些明显的东西吗？

Am I missing something obvious?

另外：为什么

NSLog(@"scrollbar? H %d V %d hide %d", 
      _imageView.hasHorizontalScroller, 
      _imageView.hasVerticalScroller,
      _imageView.autohidesScrollers);

_imageView.hasHorizontalScroller = YES;
_imageView.hasVerticalScroller = YES;
_imageView.autohidesScrollers = YES;

NSLog(@"scrollbar? H %d V %d hide %d", 
      _imageView.hasHorizontalScroller, 
      _imageView.hasVerticalScroller,
      _imageView.autohidesScrollers);

给我：

scrollbar? H 0 V 0 hide 0
scrollbar? H 0 V 0 hide 0

？

此外另外：

等价原因：

 BOOL b = _imageView.autohidesScrollers = YES;
 NSLog (@"b %d scrollers %d", b, _imageView.autohidesScrollers);

print b 1 scrollers 0？

print b 1 scrollers 0 ?

推荐答案

可能在IKImageViewDemo中引起注意的一件事是图像被缩放到适合 windowDidResize：方法（ [_ imageView zoomImageToFit：self] ）。

One thing that may have been catching you up in IKImageViewDemo was that the image was zoomed to fit in the windowDidResize: method ([_imageView zoomImageToFit: self]).

在NSScrollView中嵌入IKImageView是正确的做法。为了在调整窗口大小时让滚动条跟随窗口，您需要在Interface Builder中调整弹簧和支柱（==自动调整遮罩）。

Embedding the IKImageView in a NSScrollView is the right thing to do. In order to get the scrollbars to follow the window as you resize it, you need to adjust the springs and struts (== autoresizing mask) in Interface Builder.

附录：正如您所注意到的，Mac OS X 10.6中存在一个错误，导致无法正常工作。您可以通过子类化NSScrollView来解决此问题，如下所示：

Addendum: As you've noticed, there is a bug in Mac OS X 10.6 that causes this not to work properly. You can work around the problem by subclassing the NSScrollView as follows:

@interface IKImageClipView : NSClipView
- (NSRect)docRect;
@end

@implementation ScrollViewWorkaround

- (void)reflectScrolledClipView:(NSClipView *)cView;
{
    NSView *_imageView = [self documentView];
    [super reflectScrolledClipView:cView];
    if ([_imageView isKindOfClass:[IKImageView class]] &&
         [[self contentView] isKindOfClass:[IKImageClipView class]] &&
         [[self contentView] respondsToSelector:@selector(docRect)]) {
        NSSize docSize = [(IKImageClipView *)[self contentView] docRect].size;
        NSSize scrollViewSize = [self contentSize];
        // NSLog(@"doc %@ scrollView %@", NSStringFromSize(docSize), NSStringFromSize(scrollViewSize));
        if (docSize.height > scrollViewSize.height || docSize.width > scrollViewSize.width)
         ((IKImageView *)_imageView).autohidesScrollers = NO;
        else
         ((IKImageView *)_imageView).autohidesScrollers = YES;
    }
}

@end

尝试这个：

http：/ /dl.dropbox.com/u/1583683/IKImageViewDemo.zip

这是带滚动条的IKImageViewDemo版本以及上述解决方法。

It's a version of IKImageViewDemo with scroll bars and the above workaround.

这篇关于IKImageView和滚动条的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！