ios - 如何进行高亮匹配(NSRegularExpression)？

Question

我想让 TextView 中的匹配项为蓝色。

NSString *text = @"Except as contained in #wep this notice, the name of a copyright #ololo holder shall not be used in  #pewpewpew advertising or otherwise to #promote";

NSRegularExpression *regex = [NSRegularExpression regularExpressionWithPattern:@"#\\w*" options:0 error:NULL];
NSArray *matches = [regex matchesInString:text options:0 range:NSMakeRange(0, [text length])];
NSLog(@"count %d", matches.count);

for (NSTextCheckingResult *match in matches) {
    NSRange matchRange = [match range];
    NSString *match = [text substringWithRange:matchRange];
    NSLog(@"Matched string: %@", match);
}
self.myTextView.text = text;

Answer 1

您必须创建 NSAttributedString，然后根据范围应用字体并将 attributedText 设置为您的 UITextView 而不是简单的文本。

您的代码应如下所示。

NSMutableAttributedString *attrib = [[NSMutableAttributedString alloc]initWithString:text];

for (NSTextCheckingResult *match in matches) {
    NSRange matchRange = [match range];
    NSString *match = [text substringWithRange:matchRange];
    NSLog(@"Matched string: %@", match);
    // set your rgb color here which you want i added blue color.
    [attrib addAttribute:NSForegroundColorAttributeName
                   value:[UIColor blueColor]
                   range:matchRange];
}
// set attributed text not a normal text.
self.myTextView.attributedText = attrib;

也许这对你有帮助。