h5中的图片点击放大
//MARK: -- 加载完成
- (void)webView:(WKWebView *)webView didFinishNavigation:(WKNavigation *)navigation 中加入js代码
//js方法遍历图片添加点击事件 返回图片个数
逻辑:
1.遍历获取全部的图片;（只获取detail-main div下的图片，需要哪个下的图片就取哪个上的所有图片）
2.生成一个Srting为所有图片的拼接,拼接时拿到所处数组下标;
3.为图片添加点击事件,并添加数组所处下标
注意点:
1.如果仅仅拿到url而无下标的话,网页中如果有多张相同地址的图片 则会发生位置错乱
2.声明时不要用 var yong let 不然方法添加的i 永远是length的值
*/
static NSString * const jsGetImages =
@"function getImages(){\
var objs = document.querySelectorAll(\".detail-main img\");\
var imgScr = '';\
for(let i=0;i imgScr = imgScr + objs[i].src +'LQXindex'+ i +'L+Q+X';\ objs[i].οnclick=function(){\ document.location=\"myweb:imageClick:\"+this.src + 'LQXindex' + i;\ };\ };\ return imgScr;\ };"; [webView evaluateJavaScript:jsGetImages completionHandler:^(id _Nullable result, NSError * _Nullable error) { }]; //注入自定义的js方法后别忘了调用 否则不会生效 [webView evaluateJavaScript:@"getImages()" completionHandler:^(id _Nullable result, NSError * _Nullable error) { NSString *urlResurlt = result; allUrlArray = [NSMutableArray arrayWithArray:[urlResurlt componentsSeparatedByString:@"L+Q+X"]]; if (allUrlArray.count >= 2) { [allUrlArray removeLastObject];// 此时数组为每一个图片的url } }]; 然后在wkwebview的代理方法 - (void)webView:(WKWebView *)webView decidePolicyForNavigationAction:(WKNavigationAction *)navigationAction decisionHandler:(void (^)(WKNavigationActionPolicy))decisionHandler中处理 //hasPrefix 判断创建的字符串内容是否以pic:字符开始 if ([requestString hasPrefix:@"myweb:imageClick:"]) { NSString *imageUrl = [requestString substringFromIndex:@"myweb:imageClick:".length]; if (self.photoView) { //设置不隐藏，还原放大缩小，显示图片 self.photoView.hidden = NO; self.photoView.alpha = 1.0; NSArray *imageIndex = [NSMutableArray arrayWithArray:[imageUrl componentsSeparatedByString:@"LQXindex"]]; int i = [imageIndex.lastObject intValue]; self.photoView.currentIndex = i; }else{ [self showBigImage:imageUrl];//创建视图并显示图片 } #pragma mark 显示大图片 -(void)showBigImage:(NSString *)imageUrl{ //创建灰色透明背景，使其背后内容不可操作 NSArray *imageIndex = [NSMutableArray arrayWithArray:[imageUrl componentsSeparatedByString:@"LQXindex"]]; int i = [imageIndex.lastObject intValue]; self.photoView = [[CCBigImageView alloc] initWithFrame:CGRectMake(0, 0, SCREEN_WIDTH, SCREEN_HEIGHT) images:allUrlArray imageIndex:i]; self.photoView.backgroundColor = [UIColor blackColor]; [self.view addSubview:self.photoView]; } 图片放大 .h
@interface CCBigImageView : CCBaseView @property (nonatomic, assign) NSInteger currentIndex; /** 初始化 @param frame frame @param imageArr 所有图片数组 @param index 点击的图片的index @return CCBigImageView */ - (id)initWithFrame:(CGRect)frame images:(NSMutableArray *)imageArr imageIndex:(NSInteger)index; -(void)hideView; .m
@interface CCBigImageView()<UIScrollViewDelegate,UIGestureRecognizerDelegate> { NSMutableArray *_imageArr; NSUInteger _count; } @property (nonatomic, strong) UIScrollView *imageScrollView; @property (nonatomic, strong) UILabel *imageCountLab; @end @implementation CCBigImageView - (id)initWithFrame:(CGRect)frame { self = [super initWithFrame:frame]; if (self) { // Initialization code [self setupScrollView]; } return self; } - (id)initWithFrame:(CGRect)frame images:(NSMutableArray *)imageArr imageIndex:(NSInteger)index { _imageArr = imageArr; _count = _imageArr.count; self = [super initWithFrame:frame]; if (self) { [self setupScrollView]; self.currentIndex = index; } return self; } -(void)hideView{ [UIView animateWithDuration:0.2 animations:^{ self.alpha = 0; } completion:^(BOOL finished) { for (UIScrollView *s in self.imageScrollView.subviews){ if ([s isKindOfClass:[UIScrollView class]]){ [s setZoomScale:1.0]; } } self.hidden = YES; }]; } -(void)setCurrentIndex:(NSInteger)currentIndex{ _currentIndex = currentIndex; self.imageCountLab.text= [NSString stringWithFormat:@"%ld/%ld",_currentIndex+1,_count]; self.imageScrollView.contentOffset = CGPointMake(currentIndex*SCREEN_WIDTH, 0); self.imageCountLab.text = [NSString stringWithFormat:@"%ld/%ld",currentIndex+1,_count]; } - (void)setupScrollView { self.imageScrollView = [[UIScrollView alloc]initWithFrame:CGRectMake(0,0,self.frame.size.width,self.frame.size.height-40)]; self.imageScrollView.backgroundColor = [UIColor clearColor]; self.imageScrollView.scrollEnabled =YES; self.imageScrollView.pagingEnabled =YES; self.imageScrollView.delegate =self; self.imageScrollView.contentSize =CGSizeMake(_count*SCREEN_WIDTH,self.frame.size.height-40); UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(hideView)]; tap.delegate = self; [self.imageScrollView addGestureRecognizer:tap]; for (int i =0; i <_count; i++){ UITapGestureRecognizer *doubleTap =[[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(handleDoubleTap:)]; doubleTap.delegate = self; [doubleTap setNumberOfTapsRequired:2]; UIScrollView *s = [[UIScrollView alloc]initWithFrame:CGRectMake(self.frame.size.width*i,0,self.frame.size.width, self.frame.size.height-40)]; s.contentSize = CGSizeMake(self.frame.size.width, self.frame.size.height-40); s.backgroundColor = [UIColor clearColor]; s.delegate =self; s.bouncesZoom = YES; s.minimumZoomScale = 1.0; s.maximumZoomScale = [self getTheScale]; s.showsVerticalScrollIndicator = NO; s.showsHorizontalScrollIndicator = NO; s.tag = i+1; [s setZoomScale:1.0]; UIImageView *imageview = [[UIImageView alloc]initWithFrame:CGRectMake(0,0,SCREEN_WIDTH, 400)]; imageview.backgroundColor = [UIColor clearColor]; imageview.centerY = self.centerY; NSString *imageStr = [_imageArr objectAtIndex:i]; NSString *imageURL = [[imageStr componentsSeparatedByString:@"LQXindex"] firstObject]; [imageview sd_setImageWithURL:[NSURL URLWithString:imageURL] placeholderImage:[UIImage imageNamed:@""]]; imageview.contentMode = UIViewContentModeScaleAspectFit; imageview.userInteractionEnabled =YES; imageview.tag = i+1; [imageview addGestureRecognizer:doubleTap]; [s addSubview:imageview]; [self.imageScrollView addSubview:s]; [tap requireGestureRecognizerToFail:doubleTap]; } self.imageCountLab = [[UILabel alloc] initWithFrame:CGRectMake(0,self.frame.size.height-40 , self.frame.size.width, 30)]; self.imageCountLab.textAlignment = NSTextAlignmentCenter; self.imageCountLab.font = [UIFont systemFontOfSize:15]; self.imageCountLab.textColor = [UIColor whiteColor]; [self addSubview:self.imageCountLab]; [self addSubview:self.imageScrollView]; } #pragma mark - ScrollView delegate -(UIView *)viewForZoomingInScrollView:(UIScrollView *)scrollView{ if (scrollView.tag >= 1) { for (UIView *v in scrollView.subviews){ return v; } } return nil; } - (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation { if(interfaceOrientation == UIInterfaceOrientationPortrait||interfaceOrientation == UIInterfaceOrientationPortraitUpsideDown) { return YES; } return NO; } -(void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView{ if (scrollView == self.imageScrollView){ CGFloat x = scrollView.contentOffset.x; if (x==-333){ } else { for (UIScrollView *s in scrollView.subviews){ if ([s isKindOfClass:[UIScrollView class]]){ [s setZoomScale:1.0]; //scrollView每滑动一次将要出现的图片较正常时候图片的倍数（将要出现的图片显示的倍数） } } } } } -(void)scrollViewDidScroll:(UIScrollView *)scrollView{ if (scrollView == self.imageScrollView){ CGFloat x = scrollView.contentOffset.x; if (x==-333){ } else { NSInteger index = x/self.frame.size.width; self.imageCountLab.text= [NSString stringWithFormat:@"%ld/%ld",index+1,_count]; } } } - (void)scrollViewDidZoom:(UIScrollView *)scrollView { if (scrollView.tag >= 1) { for (UIView *enlargeImage in scrollView.subviews){ CGSize boundsSize = scrollView.bounds.size; CGSize contentSize = scrollView.contentSize; CGPoint imgCenter = CGPointMake(contentSize.width / 2.0, contentSize.height / 2.0+CCNavBarHeight); if (contentSize.width < boundsSize.width) { imgCenter.x = boundsSize.width / 2.0; } if (contentSize.height < boundsSize.height) { imgCenter.y = boundsSize.height / 2.0; } enlargeImage.center = imgCenter; enlargeImage.contentMode = UIViewContentModeScaleAspectFit; } } } #pragma mark - -(void)handleDoubleTap:(UIGestureRecognizer *)gesture{ float scale = [self getTheScale]; float newScale = [(UIScrollView*)gesture.view.superview zoomScale] * scale;//每次双击放大倍数 if (newScale <= scale) { gesture.view.contentMode = UIViewContentModeScaleToFill; CGRect zoomRect = [self zoomRectForScale:newScale withCenter:[gesture locationInView:gesture.view]]; [(UIScrollView*)gesture.view.superview zoomToRect:zoomRect animated:YES]; } else{ newScale = 1; gesture.view.contentMode = UIViewContentModeScaleAspectFit; [(UIScrollView*)gesture.view.superview setZoomScale:newScale animated:YES]; } } - (CGRect)zoomRectForScale:(float)scale withCenter:(CGPoint)center { CGRect zoomRect; zoomRect.size.height = self.frame.size.height / scale; zoomRect.size.width = self.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; } - (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer{ return YES; } -(float)getTheScale{ float height = self.frame.size.height-40; return height/400.0; }