我正在尝试将滚动条添加到 IKImageView。基本上目前，我需要一些将图像加载到视图中的程序示例，如果窗口太小，则设置滚动条以执行正确的操作...
为什么我在 Apple 开发网站上找不到这些示例？
添加信息：
查看 ImagekitDemo 后，我发现我确实需要将 IKIMageView 嵌入到 ScrollView 中。 （不知何故，这使得 IKImageView 的 has___Scroller 属性为 YES...）
但是，现在（在 ImageKitDemo 中也是如此）只要只需要一个（或不需要）滚动条就可以了。但是，只要两者都需要，并且窗口的任一尺寸小于图像，两个滚动条都会消失。
鼠标滚动仍然有效。
【问题讨论】：
标签： objective-c macos scrollbars ikimageview
ZoomViewController.h
@interface ZoomViewController : UIViewController <UIScrollViewDelegate>
{
ForecastImage* detailImage; // wrapper class around UIImage (optional - could just be UIImage)
IBOutlet UIImageView* imageView;
IBOutlet DoubleTapScrollView* zoomableScrollView;
}
@property (readwrite, nonatomic, retain) ForecastImage* detailImage;
- (IBAction) dismissZoomViewController;
- (UIView *) viewForZoomingInScrollView:(UIScrollView *)scrollView;
- (void) scrollViewDidEndZooming:(UIScrollView *)scrollView withView:(UIView *)view atScale:(float)scale;
@end
ZoomViewController.m
@implementation ZoomViewController
@synthesize detailImage;
- (void)viewDidLoad
{
[super viewDidLoad];
}
- (void)viewWillAppear:(BOOL)animated
{
[imageView setImage:[self.detailImage renderedImage]];
[zoomableScrollView setContentSize:[[imageView image] size]];
[zoomableScrollView setMaximumZoomScale:5.0];
[zoomableScrollView setMinimumZoomScale:0.25];
}
- (void) viewDidAppear:(BOOL)animated
{
self.navigationItem.title = [SearchService getDisplayName:[self.detailImage forecastArea]];
}
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
return (interfaceOrientation == UIInterfaceOrientationPortrait);
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning]; // Releases the view if it doesn't have a superview
// Release anything that's not essential, such as cached data
}
- (void)dealloc
{
imageView.image = nil;
self.detailImage = nil;
[super dealloc];
}
- (IBAction) dismissZoomViewController
{
[self dismissModalViewControllerAnimated:YES];
}
#pragma mark Pinch-n-Zoom
- (UIView *)viewForZoomingInScrollView:(UIScrollView *)scrollView
{
return imageView;
}
- (void) scrollViewDidEndZooming:(UIScrollView *)scrollView withView:(UIView *)view atScale:(float)scale
{
CGSize newSize = CGSizeMake(imageView.image.size.width * scale, imageView.image.size.height * scale);
[scrollView setContentSize:newSize];
}
@end
【讨论】：
最好的起点是Scroll View Programming Guide。基本上，您需要将 IKImageView 放在 NSScrollView 中。如果 IKImageView 的大小超过了 NSScrollView 的可见矩形，就会出现滚动条。
以下sample uses IKImageView 执行各种缩放和调整大小操作。
【讨论】：