-(void)create{
_scrollerView = [[UIScrollView alloc]initWithFrame:CGRectMake(0, 0, YHScreemW, YHScreemH)];
_scrollerView.showsVerticalScrollIndicator = NO;
_scrollerView.showsHorizontalScrollIndicator = NO;
_scrollerView.minimumZoomScale = 1.0;
_scrollerView.maximumZoomScale = 2.0;
_scrollerView.delegate = self;
[self.view addSubview:_scrollerView];
//粘贴一张图片
_imageView = [[UIImageView alloc] init];
_imageView.frame = CGRectMake(0, 0, _scrollerView.frame.size.width, _scrollerView.frame.size.height);
_imageView.center = CGPointMake(_scrollerView.frame.size.width/2, _scrollerView.frame.size.height/2);
_imageView.contentMode = UIViewContentModeScaleAspectFit;
[_imageView setImage:[UIImage imageWithData:_picData]];
[_imageView setUserInteractionEnabled:YES];
[_scrollerView addSubview:_imageView];
//添加双击事件
UITapGestureRecognizer *doubleTapGesture = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(handleDoubleTap:)];
[doubleTapGesture setNumberOfTapsRequired:2];
[_imageView addGestureRecognizer:doubleTapGesture];
//添加双击事件
UITapGestureRecognizer *singleTapGesture = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(singleTapGesture)];
[singleTapGesture requireGestureRecognizerToFail:doubleTapGesture];//没有这个单击会阻挡双击
[_imageView addGestureRecognizer:singleTapGesture];
}
- (UIView *)viewForZoomingInScrollView:(UIScrollView *)scrollView
{
return _imageView;
}
- (void)handleDoubleTap:(UIGestureRecognizer *)gesture
{
CGFloat zoomScale = _scrollerView.zoomScale;
zoomScale = (zoomScale == 1.0) ? 2.0 : 1.0;
CGRect zoomRect = [self zoomRectForScale:zoomScale withCenter:[gesture locationInView:gesture.view]];
[_scrollerView zoomToRect:zoomRect animated:YES];
}
- (CGRect)zoomRectForScale:(float)scale withCenter:(CGPoint)center
{
CGRect zoomRect;
zoomRect.size.height =_scrollerView.frame.size.height / scale;
zoomRect.size.width =_scrollerView.frame.size.width / scale;
zoomRect.origin.x = center.x - (zoomRect.size.width /2.0);
zoomRect.origin.y = center.y - (zoomRect.size.height /2.0);
return zoomRect;
}
-(void)singleTapGesture{
[self dismissViewControllerAnimated:YES completion:nil];
}