要保存网页中的图片,关键是要获取手指点击位置的图片的url地址,这就需要从js调用oc的方法。下面介绍两种方法来实现图片保存功能,但是这两种方法都只适用于图片地址用如下形式表示才可以获取:
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如果图片是通过js动态生成的,就无法使用下面的方法获取
方法1、获取点击位置的图片的src属性
实现原理:
该方法主要是获取手指点击的位置,然后获取该位置的标签的src属性,如果是img标签,那么就可以获取到url。如果是其他标签,就无法获取到url属性。
//在分线程中下载、缓存、读取 在主线程中显示图片
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
NSData* data = [self saveServiceImage:[NSURL URLWithString:[NSString stringWithFormat:@"%@%@", kImageServerRootURL, [dic valueForKey:@"serviceIconUrl2"]]]];
dispatch_async(dispatch_get_main_queue(), ^{
if (data) {
cell.titleImage.image = [UIImage imageWithData:data];
}
else {
cell.titleImage.image = [UIImage imageNamed:@"erweima"];
}
- (BOOL)webView:(UIWebView*)webView shouldStartLoadWithRequest:(NSURLRequest*)request navigationType:(UIWebViewNavigationType)navigationType
{
NSString* requestString = [[request URL] absoluteString];
NSArray* components = [requestString componentsSeparatedByString:@":"];
if ([components count] > 1 && [(NSString*)[components objectAtIndex:0] isEqualToString:@"lfyprotocol"]) {
if ([(NSString*)[components objectAtIndex:1] isEqualToString:@"http"] || [(NSString*)[components objectAtIndex:1] isEqualToString:@"https"]) {
// NSString *path = [NSString stringWithFormat:@"%@:%@:%@",[components objectAtIndex:1],[components objectAtIndex:2],[components objectAtIndex:3]];
NSString* path = [requestString substringWithRange:NSMakeRange(12, requestString.length - 12)];
NSMutableDictionary* dic = [[[NSMutableDictionary alloc] init] autorelease];
[dic setObject:path forKey:@"imageURL"];
[[NSNotificationCenter defaultCenter] postNotificationName:@"browsePhoto" object:nil userInfo:dic];
}
return NO;
}
if ([self.titleName isEqualToString:NoPaperTitle]) {
if ([[requestString componentsSeparatedByString:@"userInfo"] count] >= 2) {
NSArray* array = [requestString componentsSeparatedByString:@"="];
//获取并转换所需参数
NSString* str = [array[1] stringByReplacingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
NSDictionary* jsonDict = [SystemUtils jumpTowebView:str];
// 获取fn 字符串转字典
NSDictionary* fnDic = [imageEnarge JsonStringToDict:array[1]];
//字典转json
NSString* jsonStr = [imageEnarge dictionaryToJson:jsonDict];
//拼接注册函数
NSString* stri2 = [NSString stringWithFormat:@"%@(%@);", [fnDic objectForKey:@"fn"], jsonStr];
[webView stringByEvaluatingJavaScriptFromString:stri2];
return NO;
}
}
return YES;
}
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