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<objs.length;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;
}