iOS - label识别text中的网址链接并做链接效果的展示

识别URL的正则表达式:

方案一：

((http[s]{0,1}|ftp)://[a-zA-Z0-9\\.\\-]+\\.([a-zA-Z]{2,4})(:\\d+)?(/[a-zA-Z0-9\\.\\-~!@#$%^&*+?:_/=<>]*)?)|(www.[a-zA-Z0-9\\.\\-]+\\.([a-zA-Z]{2,4})(:\\d+)?(/[a-zA-Z0-9\\.\\-~!@#$%^&*+?:_/=<>]*)?)

方案二：

    NSString *regulaStr = @"((http[s]{0,1}|ftp)://[a-zA-Z0-9\\.\\-]+\\.([a-zA-Z]{2,4})(:\\d+)?(/[a-zA-Z0-9\\.\\-~!@#$%^&*+?:_/=<>]*)?)|(www.[a-zA-Z0-9\\.\\-]+\\.([a-zA-Z]{2,4})(:\\d+)?(/[a-zA-Z0-9\\.\\-~!@#$%^&*+?:_/=<>]*)?)";

可以通过分类的方式给label添加个分类, 为label新增个分类方法:
.h文件

#import <UIKit/UIKit.h>
@interface UILabel (LinkUrl)

- (void)setTextWithLinkAttribute:(NSString *)text;

@end

.m文件

#import "UILabel+LinkUrl.h"



@implementation UILabel (LinkUrl)

- (void)setTextWithLinkAttribute:(NSString *)text {

    self.attributedText = [self subStr:text];

}


-(NSMutableAttributedString*)subStr:(NSString *)string

{

    NSError *error;

    //可以识别url的正则表达式

    NSString *regulaStr = @"((http[s]{0,1}|ftp)://[a-zA-Z0-9\\.\\-]+\\.([a-zA-Z]{2,4})(:\\d+)?(/[a-zA-Z0-9\\.\\-~!@#$%^&*+?:_/=<>]*)?)|(www.[a-zA-Z0-9\\.\\-]+\\.([a-zA-Z]{2,4})(:\\d+)?(/[a-zA-Z0-9\\.\\-~!@#$%^&*+?:_/=<>]*)?)";

    NSRegularExpression *regex = [NSRegularExpression regularExpressionWithPattern:regulaStr

                                                                           options:NSRegularExpressionCaseInsensitive

                                                                             error:&error];

    NSArray *arrayOfAllMatches = [regex matchesInString:string options:0 range:NSMakeRange(0, [string length])];

    NSMutableArray *arr=[[NSMutableArray alloc]init];

    NSMutableArray *rangeArr=[[NSMutableArray alloc]init];



    for (NSTextCheckingResult *match in arrayOfAllMatches)

    {

        NSString* substringForMatch;

        substringForMatch = [string substringWithRange:match.range];

        [arr addObject:substringForMatch];



    }

    NSString *subStr=string;

    for (NSString *str in arr) {

        [rangeArr addObject:[self rangesOfString:str inString:subStr]];

    }

    UIFont *font = [UIFont systemFontOfSize:20];

    NSMutableAttributedString *attributedText;

    attributedText=[[NSMutableAttributedString alloc]initWithString:subStr attributes:@{NSFontAttributeName :font}];



    for(NSValue *value in rangeArr)

    {

        NSInteger index=[rangeArr indexOfObject:value];

        NSRange range=[value rangeValue];

        [attributedText addAttribute:NSLinkAttributeName value:[NSURL URLWithString:[arr objectAtIndex:index]] range:range];

        [attributedText addAttribute:NSForegroundColorAttributeName value:[UIColor blueColor] range:range];



    }

    return attributedText;





}

//获取查找字符串在母串中的NSRange

- (NSValue *)rangesOfString:(NSString *)searchString inString:(NSString *)str {



    NSRange searchRange = NSMakeRange(0, [str length]);



    NSRange range;



    if ((range = [str rangeOfString:searchString options:0 range:searchRange]).location != NSNotFound) {

        searchRange = NSMakeRange(NSMaxRange(range), [str length] - NSMaxRange(range));

    }

    return [NSValue valueWithRange:range];

}

@end

在你创建label的地方调用这个新增方法:

UILabel *label=[[UILabel alloc]initWithFrame:CGRectMake(18, 100, CGRectGetWidth(self.view.frame) - 36, 100)];

label.numberOfLines = 0;

[label setTextWithLinkAttribute:@"谷歌搜索好用http://www.google.com搜索用什么https://www.baidu.com百度一下你知道"];

[self.view addSubview:label];

摘自：https://blog.csdn.net/bright_ty/article/details/53671173