方向更改后，将UIScrollView重置为新的框架尺寸
我有一个ImageZoom类，它是UIView的子类，是UIScrollView的一个图例。 这非常简单。 该类包含一个包含UIImageView的UIScrollView。 当类的实例被添加到视图控制器时，图像被缩放，以便与视图齐平。 有两种方法可以在重复时双击并缩小。 除了当我改变方向到风景时，一切都很好。 我似乎无法弄清楚如何获得正确的缩放，使图像现在与新的方向齐平。 这里是一个链接到文件以及：
http://www.2shared.com/file/bowDjzLr/imagescroll.html
ViewController.h
#import <UIKit/UIKit.h> #import "ImageZoom.h" @interface ViewController : UIViewController @end ViewController.m
#import "ViewController.h" @interface ViewController () @property (nonatomic,strong) ImageZoom *imageZoom; @property (nonatomic, strong) UIImage *image; @end @implementation ViewController - (void)viewDidLoad { [super viewDidLoad]; self.image = [UIImage imageNamed:@"1.png"]; } -(void)viewDidAppear:(BOOL)animated { ImageZoom *imageZoom = [[ImageZoom alloc]initWithImage:self.image andFrame:self.view.bounds]; self.imageZoom = imageZoom; [self.view addSubview:imageZoom]; } -(void)willAnimateRotationToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation duration:(NSTimeInterval)duration { [self.imageZoom willAnimateToFrame:self.view.bounds]; } @end
ImageZoom.h
#import <UIKit/UIKit.h> @interface ImageZoom : UIView <UIScrollViewDelegate> - (id)initWithImage:(UIImage *)image andFrame:(CGRect)frame; -(void)willAnimateToFrame:(CGRect)frame; @end
ImageZoom.m
#import "ImageZoom.h" @interface ImageZoom () @property (nonatomic, strong) UIImage *image; @property (nonatomic, strong) UIImageView *imageView; @property (nonatomic, strong) UIScrollView *scrollView; @property BOOL zoomed; @end @implementation ImageZoom - (id)initWithFrame:(CGRect)frame { self = [super initWithFrame:frame]; if (self) { [self loadContent]; } return self; } -(void)loadContent { self.scrollView = [[UIScrollView alloc]initWithFrame:CGRectMake(0, 0, self.frame.size.width, self.frame.size.height)]; self.scrollView.delegate = self; self.scrollView.contentSize = self.image.size; [self.scrollView addSubview:self.imageView]; [self addSubview:self.scrollView]; 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; self.scrollView.maximumZoomScale = 1; self.scrollView.zoomScale = minScale; UITapGestureRecognizer *doubleTapRecognizer = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(scrollViewDoubleTapped:)]; doubleTapRecognizer.numberOfTapsRequired = 2; doubleTapRecognizer.numberOfTouchesRequired = 1; [self.scrollView addGestureRecognizer:doubleTapRecognizer]; } -(void)willAnimateToFrame:(CGRect)frame { self.scrollView.frame = CGRectMake(0, 0, frame.size.width, frame.size.height); 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; self.scrollView.maximumZoomScale = 1; self.scrollView.zoomScale = minScale; CGPoint centerPoint = CGPointMake(CGRectGetMidX(self.scrollView.frame), CGRectGetMidY(self.scrollView.frame)); [self view:self.imageView setCenter:centerPoint]; } - (void)view:(UIView*)view setCenter:(CGPoint)centerPoint { CGRect viewFrame = view.frame; CGPoint scrollViewContentOffset = self.scrollView.contentOffset; CGFloat x = centerPoint.x - viewFrame.size.width / 2.0; CGFloat y = centerPoint.y - viewFrame.size.height / 2.0; if(x < 0) { scrollViewContentOffset.x = -x; viewFrame.origin.x = 0.0; } else { viewFrame.origin.x = x; } if(y < 0) { scrollViewContentOffset.y = -y; viewFrame.origin.y = 0.0; } else { viewFrame.origin.y = y; } view.frame = viewFrame; self.scrollView.contentOffset = scrollViewContentOffset; self.zoomed = NO; } - (id)initWithImageView:(UIImageView *)imageView andFrame:(CGRect)frame { self.image = imageView.image; self.imageView = imageView; return [self initWithFrame:frame]; } - (id)initWithImage:(UIImage *)image andFrame:(CGRect)frame { self.image = image; self.imageView = [[UIImageView alloc] initWithImage:self.image]; return [self initWithFrame:frame]; } - (UIView*)viewForZoomingInScrollView:(UIScrollView *)scrollView { return self.imageView; } - (void)scrollViewDidZoom:(UIScrollView *)sv { UIView* zoomView = [sv.delegate viewForZoomingInScrollView:sv]; CGRect zoomViewFrame = zoomView.frame; if(zoomViewFrame.size.width < sv.bounds.size.width) { zoomViewFrame.origin.x = (sv.bounds.size.width - zoomViewFrame.size.width) / 2.0; } else { zoomViewFrame.origin.x = 0.0; } if(zoomViewFrame.size.height < sv.bounds.size.height) { zoomViewFrame.origin.y = (sv.bounds.size.height - zoomViewFrame.size.height) / 2.0; } else { zoomViewFrame.origin.y = 0.0; } zoomView.frame = zoomViewFrame; } - (void)scrollViewDoubleTapped:(UITapGestureRecognizer*)recognizer { if(self.zoomed==NO) { CGPoint pointInView = [recognizer locationInView:self.imageView]; CGSize scrollViewSize = self.scrollView.bounds.size; CGFloat w = scrollViewSize.width / self.scrollView.maximumZoomScale; CGFloat h = scrollViewSize.height / self.scrollView.maximumZoomScale; CGFloat x = pointInView.x - (w / 2.0); CGFloat y = pointInView.y - (h / 2.0); CGRect rectToZoomTo = CGRectMake(x, y, w, h); [self.scrollView zoomToRect:rectToZoomTo animated:YES]; self.zoomed = YES; } else if(self.zoomed == YES) { CGRect rectToZoomTo = CGRectMake(0, 0, self.scrollView.contentSize.width, self.scrollView.contentSize.height); [self.scrollView zoomToRect:rectToZoomTo animated:YES]; self.zoomed = NO; } } @end
它与viewController改变方向时调用的willAnimateToFrame方法有关。 任何帮助将不胜感激。
得到它在任何人有兴趣的情况下工作。 我不得不对我的ImageZoom.m文件进行一些更改：
#import "ImageZoom.h" @interface ImageZoom () @property (nonatomic, strong) UIImage *image; @property (nonatomic, strong) UIImageView *imageView; @property (nonatomic, strong) UIScrollView *scrollView; @property BOOL zoomed; @end @implementation ImageZoom - (id)initWithFrame:(CGRect)frame { self = [super initWithFrame:frame]; if (self) { [self loadContentWithFrame:frame]; } return self; } -(void)loadContentWithFrame:(CGRect)frame { self.scrollView = [[UIScrollView alloc]initWithFrame:CGRectMake(self.frame.origin.x, self.frame.origin.y, frame.size.width, frame.size.height)]; self.scrollView.delegate = self; self.scrollView.contentSize = self.image.size; self.backgroundColor = [UIColor redColor]; [self.scrollView addSubview:self.imageView]; [self addSubview:self.scrollView]; 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; self.scrollView.maximumZoomScale = 1; self.scrollView.zoomScale = minScale; UITapGestureRecognizer *doubleTapRecognizer = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(scrollViewDoubleTapped:)]; doubleTapRecognizer.numberOfTapsRequired = 2; doubleTapRecognizer.numberOfTouchesRequired = 1; [self.scrollView addGestureRecognizer:doubleTapRecognizer]; self.zoomed = NO; } -(void)willAnimateToFrame:(CGRect)frame { self.frame = frame; [self loadContentWithFrame:frame]; } - (id)initWithImageView:(UIImageView *)imageView andFrame:(CGRect)frame { self.image = imageView.image; self.imageView = imageView; return [self initWithFrame:frame]; } - (id)initWithImage:(UIImage *)image andFrame:(CGRect)frame { self.image = image; self.imageView = [[UIImageView alloc] initWithImage:self.image]; return [self initWithFrame:frame]; } - (UIView*)viewForZoomingInScrollView:(UIScrollView *)scrollView { return self.imageView; } - (void)scrollViewDidZoom:(UIScrollView *)sv { UIView* zoomView = [sv.delegate viewForZoomingInScrollView:sv]; CGRect zoomViewFrame = zoomView.frame; if(zoomViewFrame.size.width < sv.bounds.size.width) { zoomViewFrame.origin.x = (sv.bounds.size.width - zoomViewFrame.size.width) / 2.0; } else { zoomViewFrame.origin.x = 0.0; } if(zoomViewFrame.size.height < sv.bounds.size.height) { zoomViewFrame.origin.y = (sv.bounds.size.height - zoomViewFrame.size.height) / 2.0; } else { zoomViewFrame.origin.y = 0.0; } zoomView.frame = zoomViewFrame; } - (void)scrollViewDoubleTapped:(UITapGestureRecognizer*)recognizer { if(self.zoomed==NO) { CGPoint pointInView = [recognizer locationInView:self.imageView]; CGSize scrollViewSize = self.scrollView.bounds.size; CGFloat w = scrollViewSize.width / self.scrollView.maximumZoomScale; CGFloat h = scrollViewSize.height / self.scrollView.maximumZoomScale; CGFloat x = pointInView.x - (w / 2.0); CGFloat y = pointInView.y - (h / 2.0); CGRect rectToZoomTo = CGRectMake(x, y, w, h); [self.scrollView zoomToRect:rectToZoomTo animated:YES]; self.zoomed = YES; } else if(self.zoomed == YES) { CGRect rectToZoomTo = CGRectMake(0, 0, self.scrollView.contentSize.width, self.scrollView.contentSize.height); [self.scrollView zoomToRect:rectToZoomTo animated:YES]; self.zoomed = NO; } } @end