UIScrollView 挤压 UIImageView 图像 [英] UIScrollView squashes UIImageView image
问题描述
我在 ViewDidLoad 中有以下代码，它压缩了我的 UIImage/UIImageView.我希望图像填充 UIScrollView.
I have the following code in ViewDidLoad and it squashes my UIImage/ UIImageView. I want the image to fill the UIScrollView.
[super viewDidLoad];
_imageHolder = [[UIImageView alloc]initWithFrame:self.view.frame];
_scrollView = [[UIScrollView alloc]initWithFrame:self.view.frame];
[_scrollView setBackgroundColor:[UIColor purpleColor]];
// Tell the scroll view the size of the contents
self.scrollView.contentSize = self.view.frame.size;
self.scrollView.delegate = self;
self.scrollView.scrollEnabled = YES;
FfThumbnailData* thumbData = [self.arrayOfImages objectAtIndex:self.thisImageIndex];
UIImage* fullSizedImage = [[UIImage alloc]initWithContentsOfFile:thumbData.path];
[self.imageHolder setImage:fullSizedImage];
float x = fullSizedImage.size.width;
float y = fullSizedImage.size.height;
CGRect rect = CGRectMake(0, 0, x, y);
NSLog(@"Size of image: %@", NSStringFromCGRect(rect));
//
//[self.imageHolder setImage:[UIImage imageNamed:@"P1020486.png"]];
[self.scrollView addSubview:_imageHolder];
[self.view addSubview:self.scrollView];
_imageHolder.contentMode = UIViewContentModeScaleAspectFit;
为了清晰起见，我将 UIScrollView 的背景设置为紫色:
I set the backgound of the UIScrollView to purple for clarity:
http://i1219.photobucket.com/albums/dd427/Dave_Chambers/IMG_0315.png
我应该补充一点，在我放大然后缩小之后，图像正确地放置在滚动视图中并且没有被压扁.
I should add that after I zoom in and then zoom out, the image IS correctly placed in the scrollview and not squashed.
奇怪的是，注释行 [self.imageHolder setImage:[UIImage imageNamed:@"P1020486.png"]]; 正确显示了虚拟图像 P1020486.png.
Strangely, the commented line [self.imageHolder setImage:[UIImage imageNamed:@"P1020486.png"]]; correctly displays the dummy image P1020486.png.
此外，当我下载我的应用程序数据时，图像看起来正确并且确实是 iPad 图像的正确大小 - {1936, 2592} - 我的 NSLog 行报告的大小 NSLog(@"Size of image: %@", NSStringFromCGRect(rect));
Also, when I download my app data, the image looks right and is indeed the correct size of an iPad image - {1936, 2592} - the size reported by my NSLog line NSLog(@"Size of image: %@", NSStringFromCGRect(rect));
此外，在我需要一个 UIScrollView(用于在全尺寸视图控制器中缩放照片)之前，我访问相同的图像并使用以下代码通过从一个视图控制器到另一个视图控制器的动画显示它并且它正确显示.至关重要的是，这第二段代码缺少 UIScollview.
Further, before I needed a UIScrollView (for zooming the photo in the full size View Controller) I access the same image and display it via an animation from one View Controller to another with the following code and it displays correctly. Crucially thought, this second section of code lacks a UIScollview.
-(void)animateTransition:(int)buttonInPositon {
@try {
FfThumbnailData* thumbData = [self.images objectAtIndex:buttonInPositon];
UIImage* fullSizedImage = [[UIImage alloc]initWithContentsOfFile:thumbData.path];
fullSize = [[FullSizeViewController alloc]init];
fullSize.imageHolderGhost.contentMode = UIViewContentModeScaleAspectFit;
fullSize.arrayOfImages = self.images;
fullSize.imageToPresent = fullSizedImage;
fullSize.numberOfImages = self.images.count;
fullSize.thisImageIndex = buttonInPositon;
[fullSize.imageHolderGhost setImage:fullSizedImage];
float screenWidth = self.view.bounds.size.width;
float screenHeight = self.view.bounds.size.height;
NSLog(@"ButtonFrame: %@", NSStringFromCGRect(buttonFrame));
[fullSize.view setFrame:CGRectMake(buttonFrame.origin.x, buttonFrame.origin.y, buttonFrame.size.width, buttonFrame.size.height-44)];
NSLog(@"ButtonFrame: %@", NSStringFromCGRect(fullSize.view.frame));
[self.view addSubview:fullSize.view];
fullSize.view.backgroundColor = [UIColor clearColor];
[UIView animateWithDuration:0.9 delay:0 options:UIViewAnimationCurveEaseIn animations:^{
[fullSize.view setFrame:CGRectMake(0, 0, screenWidth, screenHeight)];
} completion:^(BOOL finished){
[[self navigationController] pushViewController:fullSize animated:NO];
self.navigationController.navigationBarHidden = YES;
}];
}
@catch (NSException *exception) {
NSLog(@"%@", exception);
}
}
为了完整起见，带有 UIScrollView 的代码在一个 VC 中具有以下方法:
For completeness, the code with the UIScrollView has the following method in one VC:
-(void)presentWithScrollview:(int)buttonInPositon {
FfThumbnailData* thumbData = [self.images objectAtIndex:buttonInPositon];
UIImage* fullSizedImage = [[UIImage alloc]initWithContentsOfFile:thumbData.path];
fullSize = [[FullSizeViewController alloc]init];
fullSize.arrayOfImages = self.images;
fullSize.imageToPresent = fullSizedImage;
fullSize.numberOfImages = self.images.count;
fullSize.thisImageIndex = buttonInPositon;
[[self navigationController] pushViewController:fullSize animated:NO];
self.navigationController.navigationBarHidden = YES;
}
在目标 VC 中，以下方法可能与我的问题相关(ViewDidLoad 粘贴在此问题的顶部):
and in the destination VC the following methods may be relevant to my problem (ViewDidLoad pasted at the top of this question):
- (void)viewWillAppear:(BOOL)animated {
[super viewWillAppear:animated];
// Set up the minimum & maximum zoom scales
CGRect scrollViewFrame = self.scrollView.frame;
CGFloat scaleWidth = scrollViewFrame.size.width / self.scrollView.contentSize.width;
CGFloat scaleHeight = scrollViewFrame.size.height / self.scrollView.contentSize.height;
CGFloat minScale = MIN(scaleWidth, scaleHeight);
//
self.scrollView.minimumZoomScale = minScale;
//Can set this bigger if needs be - match iPhoto
self.scrollView.maximumZoomScale = 2.0f;
[self centerScrollViewContents];
}
- (void)centerScrollViewContents {
CGSize boundsSize = self.scrollView.bounds.size;
//NSLog(@"boundsSize: %@", NSStringFromCGSize(boundsSize));
CGRect contentsFrame = self.imageHolder.frame;
//NSLog(@"contentsFrame: %@", NSStringFromCGRect(contentsFrame));
if (contentsFrame.size.width < boundsSize.width) {
contentsFrame.origin.x = (boundsSize.width - contentsFrame.size.width) / 2.0f;
} else {
contentsFrame.origin.x = 0.0f;
}
if (contentsFrame.size.height < boundsSize.height) {
contentsFrame.origin.y = (boundsSize.height - contentsFrame.size.height) / 2.0f;
} else {
contentsFrame.origin.y = 0.0f;
}
self.imageHolder.frame = contentsFrame;
}
#pragma mark - UIScrollViewDelegate
- (UIView*)viewForZoomingInScrollView:(UIScrollView *)scrollView {
// Return the view that we want to zoom
return self.imageHolder;
//return self.scrollViewBar;
}
- (void)scrollViewDidZoom:(UIScrollView *)scrollView {
// The scroll view has zoomed, so we need to re-center the contents
[self centerScrollViewContents];
}
对此的任何帮助都会很棒.谢谢
Any help on this would be great. Thanks
推荐答案
所以，我自己找到了解决方案.出于某种原因，正如我在对问题的更新中所写的那样，任何放大，然后缩小图像都会修复图像问题并正确呈现.我将这两行添加到 viewWillAppear，上面 [self centerScrollViewContents];
So, I found the solution myself. For some reason, as I wrote in my update to the question, any zooming in, followed by zooming out of the image fixed the image problem and presented it properly. I added these two lines to viewWillAppear, above [self centerScrollViewContents];
self.scrollView.zoomScale = 2.0;
self.scrollView.zoomScale = 1.0;
问题已解决
这篇关于UIScrollView 挤压 UIImageView 图像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！
