UITextView加载HTML取出其中显示的图片
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今天改了下之前做的功能,需要拿到试题标题里面的公式图片，这个图片比较特别，因为他在标签中经过了base64。其他的图片都是用的正则在html中匹配拿到图片地址。当时蛋疼坏了... 以下是匹配的代码
- (NSString *)getImagePathInHTML:(NSString *)html withPreferFileName:(NSString *)fileName {
NSError *error = nil;
NSRegularExpression *expression = [[NSRegularExpression alloc] initWithPattern:@"(]*?>)" options:NSRegularExpressionCaseInsensitive error:&error];
NSArray *array = [expression matchesInString:html options:0 range:NSMakeRange(0, html.length)];
__block NSString *result = nil;
[array enumerateObjectsUsingBlock:^(NSTextCheckingResult *obj, NSUInteger idx, BOOL * _Nonnull stop) {
NSString *content = [html substringWithRange:obj.range];
NSRange range = [content rangeOfString:fileName];
if (range.location < html.length) {
result = content;
*stop = YES;
}
}];
NSRegularExpression *pathExpression = [NSRegularExpression regularExpressionWithPattern:@"(src/s*=/s*"?(.*?)("|>|/s+))" options:NSRegularExpressionCaseInsensitive error:0];
NSArray *pathArray = nil;
if (result) {
pathArray = [pathExpression matchesInString:result options:0 range:NSMakeRange(0, result.length)];
}
if (pathArray.count > 0) {
NSTextCheckingResult *checking = pathArray[0];
result = [result substringWithRange:checking.range];
NSRegularExpression *httpExpression = [NSRegularExpression regularExpressionWithPattern:@"((http|file).*)" options:0 error:0];
NSArray *httpChecking = [httpExpression matchesInString:result options:0 range:NSMakeRange(0, result.length)];
if (httpChecking.count > 0) {
checking = httpChecking[0];
result = [result substringWithRange:checking.range];
result = [result stringByReplacingOccurrencesOfString:@""" withString:@""];
return result;
}
}
return nil;
}这一次用这个方法可就麻烦了， 之前我也试过看看textView的代理方法里面能不能拿到点击的附件。当时我没有找到，只是找到了文件的名称，所以我就用了上面的方法去匹配。今天我终于找到了返回的data。可以直接转换成图片。代码如下：
- (BOOL)textView:(UITextView *)textView shouldInteractWithTextAttachment:(NSTextAttachment *)textAttachment inRange:(NSRange)characterRange interaction:(UITextItemInteraction)interaction NS_AVAILABLE_IOS(10_0) {
//NSFileWrapper
UIImage *image = [UIImage imageWithData:textAttachment.fileWrapper.regularFileContents];
if (image && image.classForCoder == [UIImage class]) {
if ([self.delegate respondsToSelector:@selector(topicTabViewCell:selectImage:)]) {
[self.delegate topicTabViewCell:self selectImage:image];
}
}
// NSString *preferFileName = textAttachment.fileWrapper.preferredFilename;
// if(preferFileName.length > 0) {
// NSString *imagePath = [self getImagePathInHTML:self.html withPreferFileName:preferFileName];
// if (imagePath.length > 0 && [self.delegate respondsToSelector:@selector(topicTabViewCell:selectImage:)]) {
// [self.delegate topicTabViewCell:self selectImage:imagePath];
// }
// }
return YES;
}这是我第一次发稿，写的不好，望多提意见，在此谢过！
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