UILabel中生成链接并且打开链接地址

前段时间遇到一个问题需要把UILabel显示时遇到网址便自动转化成网络链接，最终效果如下


实现步骤如下：首先在https://github.com/petrpavlik/PPLabel下载PPLabel并导入到自己的工程文件，然后在需要使用的

#import "PPLabel.h"

添加这个协议：PPLabelDelegate

self.label=[[PPLabel
alloc]initWithFrame:CGRectMake(20,
40,
SCREEN_WIDTH-40, rect.size.height
+5)];

    self.label.delegate=self;

    self.label.text=[_FAG
integerValue]==1?_taskmodel.des:_taskupmodel.des;

    

    self.label.font
= [UIFont
systemFontOfSize:15];

    self.label.textColor =
HEXCOLOR(0X888888);

    self.label.numberOfLines=0;

    [view addSubview:self.label];

    

    //self.label=desLabel;

    // self.label.delegate=self;

    

    NSError *error =
NULL;

    NSDataDetector *detector = [NSDataDetector
dataDetectorWithTypes:NSTextCheckingTypeLink
error:&error];

    

    self.matches = [detector
matchesInString:self.label.text
options:0
range:NSMakeRange(0,
self.label.text.length)];

    

    [self
highlightLinksWithIndex:NSNotFound];

- (void)label:(PPLabel *)label didBeginTouch:(UITouch *)touch onCharacterAtIndex:(CFIndex)charIndex
{

    

    [self
highlightLinksWithIndex:charIndex];

}

- (void)label:(PPLabel *)label didMoveTouch:(UITouch *)touch onCharacterAtIndex:(CFIndex)charIndex
{

    

    [self
highlightLinksWithIndex:charIndex];

}

- (void)label:(PPLabel *)label didEndTouch:(UITouch *)touch onCharacterAtIndex:(CFIndex)charIndex
{

    

    [self
highlightLinksWithIndex:NSNotFound];

    

    for (NSTextCheckingResult *match
in self.matches) {

        

        if ([match
resultType] == NSTextCheckingTypeLink) {

            

            NSRange matchRange = [match
range];

            

            if ([self
isIndex:charIndex
inRange:matchRange]) {

                

                [[UIApplication
sharedApplication]
openURL:match.URL];

                break;

            }

        }

    }

    

}

- (void)label:(PPLabel *)label didCancelTouch:(UITouch *)touch {

    

    [self
highlightLinksWithIndex:NSNotFound];

}

#pragma mark -

- (BOOL)isIndex:(CFIndex)index inRange:(NSRange)range {

    return index > range.location && index < range.location+range.length;

}

- (void)highlightLinksWithIndex:(CFIndex)index {

    

    NSMutableAttributedString* attributedString = [self.label.attributedText
mutableCopy];

    

    for (NSTextCheckingResult *match
in self.matches) {

        

        if ([match
resultType] == NSTextCheckingTypeLink) {

            

            NSRange matchRange = [match
range];

            

            if ([self
isIndex:index inRange:matchRange]) {

                [attributedString addAttribute:NSForegroundColorAttributeName
value:[UIColor
grayColor] range:matchRange];

            }

            else {

                [attributedString addAttribute:NSForegroundColorAttributeName
value:[UIColor
blueColor] range:matchRange];

            }

            

            [attributedString addAttribute:NSUnderlineStyleAttributeName
value:[NSNumber
numberWithInteger:NSUnderlineStyleSingle]
range:matchRange];

        }

    }

    

    self.label.attributedText = attributedString;

}