UItextView 高亮关键字，点击高亮字体响应点击事件

参考:

Swift - 给UITextView添加自定义链接，以及链接的点击响应

import Foundation
import UIKit

extension UITextView {

    /// 添加链接文本（链接为空时则表示普通文本），且可加大指导字符串（默认font = 13）
    ///
    /// - Parameters:
    ///   - string: 文本
    ///   - increaseStr: 需加大的字符串
    ///   - withURLString: 链接
    ///   - lineSpacing: 行间距
    func appendLinkString(string:String,
                          increaseStr:String?,
                          withURLString:String?,
                          lineSpacing:CGFloat) {
        // 原来的文本内容
        let attrString:NSMutableAttributedString = NSMutableAttributedString()
        attrString.append(self.attributedText)

        // 新增的文本内容（使用默认设置的字体样式）
        let attrs = [NSFontAttributeName : self.font!,
                     NSForegroundColorAttributeName : self.textColor ?? UIColor.black] as [String : Any]
        let appendString = NSMutableAttributedString(string: string, attributes:attrs)
        let range:NSRange = NSMakeRange(0, appendString.length)

        // 判断是否是链接文字
        if let urlStr = withURLString {
            appendString.beginEditing()
            appendString.addAttribute(NSLinkAttributeName, value:urlStr, range:range)
            appendString.endEditing()
            appendString.addAttribute(NSUnderlineStyleAttributeName, value: NSNumber.init(integerLiteral: NSUnderlineStyle.styleSingle.rawValue), range: range)
        }

        // 字体加大
        if let increase: String = increaseStr {
            let tipRange: NSRange = NSString.init(string: string).range(of:increase)
            appendString.addAttribute(NSFontAttributeName, value: UIFont.systemFont(ofSize: 13), range: tipRange)
        }

        // 调整行间距
        let paragraphStyle = NSMutableParagraphStyle()
        paragraphStyle.lineSpacing = lineSpacing
        appendString.addAttribute(NSParagraphStyleAttributeName,
                                  value: paragraphStyle,
                                  range: range)


        // 合并新的文本
        attrString.append(appendString)

        // 设置合并后的文本
        self.attributedText = attrString
    }
}

控制器中配置TextView调用appendLinkString函数

- (void)configTextView{
    self.textView.delegate = self;

    NSString *str0 = @"温馨提示:\n\n1.用户使用快捷充值不收取任何手续费。单笔充值限额根据各个银行上的充值限额为准，";
    NSString *str1 = @"点击查看银行限额说明";
    NSString *str2 = @"。\n";
    NSString *str3 = @"2.因为银行会在23:30到次日凌晨3:00进行系统数据处理，请尽量避免在此时间段充值。\n3.如果充值失败，请拨打客服咨询电话400-009-9595。";
    [self.textView appendLinkStringWithString:str0
                                  increaseStr:@"温馨提示"
                                withURLString:nil
                                  lineSpacing:5];

    [self.textView appendLinkStringWithString:str1
                                  increaseStr:nil
                                withURLString:@"look:bankCardLimits"
                                  lineSpacing:5];

    [self.textView appendLinkStringWithString:str2
                                  increaseStr:nil
                                withURLString:nil
                                  lineSpacing:5];

    [self.textView appendLinkStringWithString:str3
                                  increaseStr:nil
                                withURLString:nil
                                  lineSpacing:5];
}

UITextViewDelegate获取自定义链接Url,进行事件处理

#pragma mark - UITextViewDelegate
- (BOOL)textView:(UITextView *)textView shouldInteractWithURL:(NSURL *)URL inRange:(NSRange)characterRange{
    // 查看银行卡限额
    if ([URL.scheme isEqualToString:@"look"]) {

    }
    return YES;
}