ios开发获取网页上得全部图片

为了实现 使用WebView展示的网页的时候 可以把网页上的所有的图片给提取出来 并且可以给WebView添加点击时间 当点击到图片的时候 可以获取出改图片的Url，下面是方法的介绍

1、首先到如第三方库 TFHpple

2、
//获取网页上全部的图片-(void)dowmLoadPhoto{
NSURLRequest *request = [NSURLRequest requestWithURL:[NSURL URLWithString:path]]; NSData *response = [NSURLConnection sendSynchronousRequest:request returningResponse:nil error:nil]; if (response == nil){ UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:@"警告！" message:@"无法连接到该网站！" delegate:nil cancelButtonTitle:@"确定" otherButtonTitles:@"取消", nil]; [alertView show]; return; } NSArray *imagesData = [self parseData:response]; NSMutableArray *images = [self downLoadPicture:imagesData];}
//解析html数据- (NSArray*)parseData:(NSData*) data{ TFHpple *doc = [[TFHpple alloc] initWithHTMLData:data]; //在页面中查找img标签 NSArray *images = [doc searchWithXPathQuery:@"//img"]; return images;}

//下载图片的方法- (NSMutableArray*)downLoadPicture:(NSArray *)images{ //创建存放UIImage的数组
_downloadImages = [[NSMutableArray alloc] init]; _imageViewArr =[[NSMutableArray alloc]init];
for (int i = 0; i < [images count]; i++) {

// 查看网页里面的img标签里面的关于图片url那个标签 可能是一般是src 所以下面就是[[[images objectAtIndex:i] objectForKey:@"src"] 如果是其他的就替换下就可以了

NSString *prefix = [[[images objectAtIndex:i] objectForKey:@"src"] substringToIndex:4]; NSString *url = [[images objectAtIndex:i] objectForKey:@"src"]; //判断图片的下载地址是相对路径还是绝对路径，如果是以http开头，则是绝对地址，否则是相对地址 if ([prefix isEqualToString:@"http"] == NO){ url = [path stringByAppendingPathComponent:url]; } if(url != nil){ [_downloadImages addObject:url]; } }
}
return _downloadImages;}

//给webVeiw添加点击时间 回去点击位置的图片的Url

-(void)addTapOnWebView{ UITapGestureRecognizer* singleTap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(handleSingleTap:)]; [_wv addGestureRecognizer:singleTap]; singleTap.delegate = self; singleTap.cancelsTouchesInView = NO;}
- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer{ return YES;}

//获取点击的图片-(void)handleSingleTap:(UITapGestureRecognizer *)sender{ CGPoint pt = [sender locationInView:_wv]; NSString *imgURL = [NSString stringWithFormat:@"document.elementFromPoint(%f, %f).src", pt.x, pt.y];
NSString *urlToSave = [_wv stringByEvaluatingJavaScriptFromString:imgURL]; if([urlToSave hasPrefix:@"http"]) { int index = [_downloadImages indexOfObject:urlToSave]; int count = _downloadImages.count; // 1.封装图片数据 NSMutableArray *photos = [[NSMutableArray alloc]init]; NSMutableArray *_viewArr =[[NSMutableArray alloc]init]; for (int i = 0; i<count-1; i++) { MJPhoto *photo = [[MJPhoto alloc] init]; photo.url = [NSURL URLWithString:[_downloadImages objectAtIndex:i]] ; // 图片路径 [photos addObject:photo]; }
}