我的UIImage没有使用以下代码进行缩放。虽然缩放不起作用但识别了水龙头。它基本上是iOS开发站点的taptozoom代码，导航控制器浮动在UIScrollView和UIImageView后面。此TapToZoom代码无需导航控制器即可运行。图像拉伸是否存在问题，以允许顶部的导航栏？
#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
答案 0 :(得分：0)
默认情况下，ImageViews默认不响应用户交互，你必须设置它：
imageView.userInteractionEnabled = YES;
答案 1 :(得分：0)
您需要确保单击识别器等待双击失败。
[singleTap requireGestureRecognizerToFail:doubleTap];
答案 2 :(得分：0)
必须覆盖-loadView才能初始化self.view - 没有别的。由于我看不到初始化self.view的代码，我认为你的视图来自nib文件，因此你不能覆盖-loadView方法，或者如果超类负责这个初始化，你不必覆盖它并调用[super loadView]，但你放在那里的代码完全在错误的地方。将所有逻辑移至viewDidLoad除以下行：
// 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];
这些放在viewWillAppear:中，因为这是正确设置视图层次结构几何的位置，并且您可以拥有准确的frame属性。
答案 3 :(得分：0)
@interface RootViewController（UtilityMethods） - （CGRect）zoomRectForScale :( float）scale withCenter：（CGPoint）center; @end
@implementation RootViewController
@synthesize imageScrollView，imageView，mySlider;
（IBAction）sliderValueChanged：（UISlider *）sender { mySlider.value = [NSString stringWithFormat：imageScrollView。[sender value]];
// mySlider.value = [NSString stringWithFormat：@“％。1f”，[发送者值]];
// myTextField.text = [NSString stringWithFormat：@“％。1f”，[发送者值]]; }
（void）loadView { [super loadView];
//设置图像视图的标签 [imageView setTag：ZOOM_VIEW_TAG];
//将手势识别器添加到图像视图中 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发布]; [twoFingerTap发布];
//计算最小比例以完全适合图像宽度，并从该比例开始 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]; }
/ <强> * ** * ** * ** * ** * ** * ** * * 注 * ** * ** * ** * ** * ** * ** * * / / *以下委托方法适用于zoomToRect中的已知错误：animated： / / 在3.0之后的下一个版本中，将不再需要这种解决方法 / / <强> 的 ** * ** * ** * ** * ** * ** * ** * ** * ** * ** * ** * ** * ** * ** * ** * ** / - （void）scrollViewDidEndZooming：（UIScrollView *）scrollView withView：（UIView *）view atScale：（float）scale { [scrollView setZoomScale：scale + 0.01 animated：NO]; [scrollView setZoomScale：scale animated：NO]; }
（void）handleSingleTap：（UIGestureRecognizer *）gestureRecognizer { //单击现在什么都不做 }
（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 animated：YES]; }
（void）handleTwoFingerTap：（UIGestureRecognizer *）gestureRecognizer { //双指轻敲缩小 float newScale = [imageScrollView zoomScale] / ZOOM_STEP; CGRect zoomRect = [self zoomRectForScale：newScale withCenter：[gestureRecognizer locationInView：gestureRecognizer.view]]; [imageScrollView zoomToRect：zoomRect animated：YES]; }
（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，它将是imageScrollView边界的大小。 //随着缩放比例的减小，可见的内容越多，矩形的大小就越大。 zoomRect.size.height = [imageScrollView frame] .size.height / scale; zoomRect.size.width = [imageScrollView frame] .size.width / scale;
//选择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）;
return zoomRect; }
@end