- - (void)webViewDidFinishLoad:(UIWebView *)aWebView {
- //调整字号
- NSString *str = @"document.getElementsByTagName('body')[0].style.webkitTextSizeAdjust= '95%'";
- [webView stringByEvaluatingJavaScriptFromString:str];
- //js方法遍历图片添加点击事件 返回图片个数
- static NSString * const jsGetImages =
- @"function getImages(){\
- var objs = document.getElementsByTagName(\"img\");\
- for(var i=0;i<objs.length;i++){\
- objs[i].onclick=function(){\
- document.location=\"myweb:imageClick:\"+this.src;\
- };\
- };\
- return objs.length;\
- };";
- [webView stringByEvaluatingJavaScriptFromString:jsGetImages];//注入js方法
- //注入自定义的js方法后别忘了调用 否则不会生效(不调用也一样生效了,,,不明白)
- NSString *resurlt = [webView stringByEvaluatingJavaScriptFromString:@"getImages()"];
- //调用js方法
- // NSLog(@"---调用js方法--%@ %s jsMehtods_result = %@",self.class,__func__,resurlt);
- }
- - (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType{
- //将url转换为string
- NSString *requestString = [[request URL] absoluteString];
- // NSLog(@"requestString is %@",requestString);
- //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];
- // NSLog(@"image url------%@", imageUrl);
- if (bgView) {
- //设置不隐藏,还原放大缩小,显示图片
- bgView.hidden = NO;
- imgView.frame = CGRectMake(10, 10, SCREEN_WIDTH-40, 220);
- [imgView setImageWithURL:[NSURL URLWithString:imageUrl] placeholderImage:LOAD_IMAGE(@"house_moren")];
- }
- else
- [self showBigImage:imageUrl];//创建视图并显示图片
- return NO;
- }
- return YES;
- }
- #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
- bgView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, SCREEN_WIDTH, SCREEN_HEIGHT)];
- [bgView setBackgroundColor:[UIColor colorWithRed:0.3
- green:0.3
- blue:0.3
- alpha:0.7]];
- [self.view addSubview:bgView];
- //创建边框视图
- UIView *borderView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, SCREEN_WIDTH-20, 240)];
- //将图层的边框设置为圆脚
- borderView.layer.cornerRadius = 8;
- borderView.layer.masksToBounds = YES;
- //给图层添加一个有色边框
- borderView.layer.borderWidth = 8;
- borderView.layer.borderColor = [[UIColor colorWithRed:0.9
- green:0.9
- blue:0.9
- alpha:0.7] CGColor];
- [borderView setCenter:bgView.center];
- [bgView addSubview:borderView];
- //创建关闭按钮
- UIButton *closeBtn = [UIButton buttonWithType:UIButtonTypeCustom];
- // [closeBtn setImage:[UIImage imageNamed:@"close.png"] forState:UIControlStateNormal];
- closeBtn.backgroundColor = [UIColor redColor];
- [closeBtn addTarget:self action:@selector(removeBigImage) forControlEvents:UIControlEventTouchUpInside];
- [closeBtn setFrame:CGRectMake(borderView.frame.origin.x+borderView.frame.size.width-20, borderView.frame.origin.y-6, 26, 27)];
- [bgView addSubview:closeBtn];
- //创建显示图像视图
- imgView = [[UIImageView alloc] initWithFrame:CGRectMake(10, 10, CGRectGetWidth(borderView.frame)-20, CGRectGetHeight(borderView.frame)-20)];
- imgView.userInteractionEnabled = YES;
- [imgView setImageWithURL:[NSURL URLWithString:imageUrl] placeholderImage:LOAD_IMAGE(@"house_moren")];
- [borderView addSubview:imgView];
- //添加捏合手势
- [imgView addGestureRecognizer:[[UIPinchGestureRecognizer alloc]initWithTarget:self action:@selector(handlePinch:)]];
- }
- //关闭按钮
- -(void)removeBigImage
- {
- bgView.hidden = YES;
- }
- - (void) handlePinch:(UIPinchGestureRecognizer*) recognizer
- {
- //缩放:设置缩放比例
- recognizer.view.transform = CGAffineTransformScale(recognizer.view.transform, recognizer.scale, recognizer.scale);
- recognizer.scale = 1;
- }
效果图如下
来源: http://www.phpxs.com/code/1005564/