要找到一段字符串中的网址位置，可以用正则表达式，正则表达式比较麻烦，苹果有自带的API：NSDataDetector用方法+ (nullable NSDataDetector *)dataDetectorWithTypes:(NSTextCheckingTypes)checkingTypes error:(NSError **)error;可以看到在类NSTextCheckingTypes中的NSTextCheckingTypeLink既是检测URL的，当然里面还有很多类型
NSTextCheckingTypeOrthography // language identification
NSTextCheckingTypeSpelling // spell checking
NSTextCheckingTypeGrammar // grammar checking
NSTextCheckingTypeDate // date/time detection
NSTextCheckingTypeAddress // address detection
NSTextCheckingTypeLink // link detection
NSTextCheckingTypeQuote // smart quotes
NSTextCheckingTypeDash // smart dashes
NSTextCheckingTypeReplacement // fixed replacements, such as copyright symbol for (c)
NSTextCheckingTypeCorrection // autocorrection
NSTextCheckingTypeRegularExpression // regular expression matches
NSTextCheckingTypePhoneNumber // phone number detection
NSTextCheckingTypeTransitInformation // transit (e.g. flight) info detection
我只介绍URL的识别，其他的原理都一样的,随便找一个字符串
NSString *webString = @"这不是网址\" http://www.baidu.com\"这是我大百度帝国"; [self needHightText:webString];
- (void)needHightText:(NSString *)wholeText {
// 点击事件用的YYLabel框架，
YYLabel *mainLabel = [[YYLabel alloc]initWithFrame:CGRectMake(0, 100, 400, 100)];
[self.view addSubview:mainLabel];
mainLabel.numberOfLines = 0;
mainLabel.textColor = [UIColor purpleColor];
NSMutableAttributedString *text = [[NSMutableAttributedString alloc]initWithString:wholeText];
text.yy_font = [UIFont systemFontOfSize:17];
NSError *error;
NSDataDetector *dataDetector=[NSDataDetector dataDetectorWithTypes:NSTextCheckingTypeLink error:&error];
NSArray *arrayOfAllMatches=[dataDetector matchesInString:wholeText options:NSMatchingReportProgress range:NSMakeRange(0, wholeText.length)];
//NSMatchingOptions匹配方式也有好多种，我选择NSMatchingReportProgress，一直匹配
//我们得到一个数组，这个数组中NSTextCheckingResult元素中包含我们要找的URL的range，当然可能找到多个URL，找到相应的URL的位置，用YYlabel的高亮点击事件处理跳转网页
for (NSTextCheckingResult *match in arrayOfAllMatches)
{
// NSLog(@"%@",NSStringFromRange(match.range));
[text yy_setTextHighlightRange:match.range//设置点击的位置
color:[UIColor orangeColor]
backgroundColor:[UIColor whiteColor]
tapAction:^(UIView *containerView, NSAttributedString *text, NSRange range, CGRect rect){
NSLog(@"这里是点击事件");
//跳转用的WKWebView
WKWebView *webView = [[WKWebView alloc] initWithFrame:self.view.bounds];
[self.view addSubview:webView];
[webView loadRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:[wholeText substringWithRange:match.range]]]];
}];
}
mainLabel.attributedText = text;
}
过程解释看代码中的注释，此方法用到了YYText框架，记得导入，还有系统自带的WebKit也需要导入