iphone - 双击图像无响应

Question

我的UIImage没有用以下代码缩放。可以识别水龙头，但是变焦无法使用。它基本上是来自iOS开发人员站点的taptozoom代码，其中的导航控制器位于UIScrollView和UIImageView的后面。此TapToZoom代码无需导航控制器即可使用。图像延伸到顶部的导航栏是否存在问题？

#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 {
    //imageScrollView.userInteractionEnabled = YES;
   // [self.imageView setUserInteractionEnabled:YES];
    //[self.imageView setMultipleTouchEnabled:YES];
     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];        //added self to fix subview
    [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
    NSLog(@"single tap detected");
}

- (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 UIScroll Subview




#pragma mark Utility methods

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

    CGRect zoomRect;
    NSLog(@"zoomRectForScale");

    // 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);

    NSLog(@"end of zoom rect");
    return zoomRect;
}

@end

Answer 1

导入“RootViewController.h”

定义ZOOM_VIEW_TAG 100

定义ZOOM_STEP 1.5

@interface RootViewController(UtilityMethods)
-(CGRect)zoomRectForScale:(float)scale与Center:(CGPoint)center;
@结束

@implementation RootViewController

@synthesize imageScrollView，imageView，mySlider;

(IBAction)liderValueChanged:(UISlider *)sender {
mySlider.value = [NSString stringWithFormat:imageScrollView。[发送者值]];

//mySlider.value = [NSString stringWithFormat:@“％.1f”，[发送者值]];

//myTextField.text = [NSString stringWithFormat:@“％.1f”，[发送者值]];

(void)loadView {
[super loadView];

//设置图片视图的标签
[imageView setTag:ZOOM_VIEW_TAG];

//将手势识别器添加到图像视图
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发布]；
[doubleTap发布]；
[twoFingerTap发行]；

//计算最小比例以完全适合图像宽度，然后从该比例开始
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发布]；
[imageView发布]；
[super dealloc];

实用标记UIScrollViewDelegate方法

(UIView *)viewForZoomingInScrollView:(UIScrollView *)scrollView {
返回[imageScrollView viewWithTag:ZOOM_VIEW_TAG];

/ ******************** 注意 ******************** /
/ *以下委托方法可解决zoomToRect:animated中的已知错误:/
/在3.0之后的下一个版本中，将不再需要此解决方法/
/ ************************************************** * /
-(void)scrollViewDidEndZooming:(UIScrollView *)scrollView withView:(UIView *)view atScale:(float)scale {
[scrollView setZoomScale:scale + 0.01 animation:NO]；
[scrollView setZoomScale:缩放动画:否]；
}

实用标记mark TapDetectingImageViewDelegate方法

(void)handleSingleTap:(UIGestureRecognizer *)gestureRecognizer {
//暂时不执行任何操作

(void)handleDoubleTap:(UIGestureRecognizer *)gestureRecognizer {
//双击放大
float newScale = [imageScrollView zoomScale] * ZOOM_STEP;
CGRect zoomRect = [self zoomRectForScale:newScale withCenter:[gestureRecognizer locationInView:gestureRecognizer.view]];
[imageScrollView zoomToRect:zoomRect动画:是]；

(void)handleTwoFingerTap:(UIGestureRecognizer *)gestureRecognizer {
//两指轻按即可缩小
float newScale = [imageScrollView zoomScale] / ZOOM_STEP;
CGRect zoomRect = [self zoomRectForScale:newScale withCenter:[gestureRecognizer locationInView:gestureRecognizer.view]];
[imageScrollView zoomToRect:zoomRect动画:是]；

实用标记实用程序方法

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

CGRect zoomRect;

//缩放矩形位于内容视图的坐标中。
//缩放比例为1.0时，它将为imageScrollView边界的大小。
//随着缩放比例的减小，可以看到更多内容，矩形的大小也随之增大。
zoomRect.size.height = [imageScrollView框架] .size.height /比例尺；
zoomRect.size.width = [imageScrollView frame] .size.width / scale;

//选择一个原点以获得正确的中心。
zoomRect.origin.x = center.x-(zoomRect.size.width / 2.0);
zoomRect.origin.y = center.y-(zoomRect.size.height / 2.0);

返回zoomRect;

@结束