ジェスチャー認識機能がアクティブでない - UIScrollView内のUIImageView

Question

私はこのコードをしばらく見てきましたが、まだ動作していないのは困惑しています。基本的に： 1.ユーザーはテーブルビューセル を選択します。2. UIScrollViewは、高解像度画像またはUIImageを含む呼び出しです。 3.次のジェスチャーが画像からピックアップ取得されていませんMap.m

#import "Map.h" 

#define ZOOM_VIEW_TAG 100 
#define ZOOM_STEP 1.5 


@interface Map (UtilityMethods) 
- (CGRect)zoomRectForScale:(float)scale withCenter:(CGPoint)center; 
@end 


@implementation Map 

@synthesize imageScrollView, imageView; 

- (void)loadView { 
    NSLog(@"beginning of loadView in map.m"); 
    [super loadView]; 

    // set the tag for the image view 
    [imageView setTag:ZOOM_VIEW_TAG]; 
    imageScrollView.scrollEnabled = NO; 

    // add gesture recognizers to the image view 
    UITapGestureRecognizer *singleTap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(handleSingleTap:)]; 
    UITapGestureRecognizer *doubleTap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(handleDoubleTap:)]; 
    UITapGestureRecognizer *twoFingerTap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(handleTwoFingerTap:)]; 

    [doubleTap setNumberOfTapsRequired:2]; 
    [twoFingerTap setNumberOfTouchesRequired:2]; 

    [imageView addGestureRecognizer:singleTap]; 
    [imageView addGestureRecognizer:doubleTap]; 
    [imageView addGestureRecognizer:twoFingerTap]; 

    [singleTap release]; 
    [doubleTap release]; 
    [twoFingerTap release]; 

    // calculate minimum scale to perfectly fit image width, and begin at that scale 
    float minimumScale = [imageScrollView frame].size.width/[imageView frame].size.width; 
    [imageScrollView setMinimumZoomScale:minimumScale]; 
    [imageScrollView setZoomScale:minimumScale]; 
} 


- (void)viewDidUnload { 
    self.imageScrollView = nil; 
    self.imageView = nil; 
} 


- (void)dealloc { 
    [imageScrollView release]; 
    [imageView release]; 
    [super dealloc]; 
} 

#pragma mark UIScrollViewDelegate methods 

- (UIView *)viewForZoomingInScrollView:(UIScrollView *)scrollView { 
    return [imageScrollView viewWithTag:ZOOM_VIEW_TAG]; 
} 

/************************************** NOTE **************************************/ 
/* The following delegate method works around a known bug in zoomToRect:animated: */ 
/* In the next release after 3.0 this workaround will no longer be necessary  */ 
/**********************************************************************************/ 
- (void)scrollViewDidEndZooming:(UIScrollView *)scrollView withView:(UIView *)view atScale:(float)scale { 
    [scrollView setZoomScale:scale+0.01 animated:NO]; 
    [scrollView setZoomScale:scale animated:NO]; 
} 

#pragma mark TapDetectingImageViewDelegate methods 

- (void)handleSingleTap:(UIGestureRecognizer *)gestureRecognizer { 
    // single tap does nothing for now 
} 

- (void)handleDoubleTap:(UIGestureRecognizer *)gestureRecognizer { 
    // double tap zooms in 
    NSLog(@"beginning handleDoubleTap to zoom"); 
    float newScale = [imageScrollView zoomScale] * ZOOM_STEP; 
    CGRect zoomRect = [self zoomRectForScale:newScale withCenter:[gestureRecognizer locationInView:gestureRecognizer.view]]; 
    [imageScrollView zoomToRect:zoomRect animated:YES]; 
} 

- (void)handleTwoFingerTap:(UIGestureRecognizer *)gestureRecognizer { 
    // two-finger tap zooms out 
    float newScale = [imageScrollView zoomScale]/ZOOM_STEP; 
    CGRect zoomRect = [self zoomRectForScale:newScale withCenter:[gestureRecognizer locationInView:gestureRecognizer.view]]; 
    [imageScrollView zoomToRect:zoomRect animated:YES]; 
} 

#pragma mark Utility methods 

- (CGRect)zoomRectForScale:(float)scale withCenter:(CGPoint)center { 

    CGRect zoomRect; 

    // the zoom rect is in the content view's coordinates. 
    // At a zoom scale of 1.0, it would be the size of the imageScrollView's bounds. 
    // As the zoom scale decreases, so more content is visible, the size of the rect grows. 
    zoomRect.size.height = [imageScrollView frame].size.height/scale; 
    zoomRect.size.width = [imageScrollView frame].size.width/scale; 

    // choose an origin so as to get the right center. 
    zoomRect.origin.x = center.x - (zoomRect.size.width/2.0); 
    zoomRect.origin.y = center.y - (zoomRect.size.height/2.0); 

    return zoomRect; 
} 

@end 

呼ばれているのですか？助けてください

Answer 1

UIImageViewデフォルトでタッチ&マルチタッチ対話が無効になっています。タッチを検出するには、それを自分で有効にする必要があります。あなたのジェスチャー認識機能が動作するには、loadViewにこれを追加する必要があります。

はコードでこれを試してみてください -

[imageView setUserInteractionEnabled:YES]; 
[imageView setMultipleTouchEnabled:YES]; 

この特定のアクションは、Xcodeで有効にすることができます。 xibファイル。このためにはxibがあり、imageViewが存在し、user interaction/multi touchと表示されているボックスにチェックを入れてください。