将UILabel或UITextView中的文字设置为超链接

将UILabel或UITextView中的文字设置为超链接

判断是否符合超链接格式

-(BOOL)isUrlValid:(NSString*)urlStr{
	NSLog(@" 判断url是否合法 ");
	NSError *error;
	NSString *regulaStr = @"((http{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* matchedArr = [regex matchesInString:urlStr options:NSMatchingReportProgress range:NSMakeRange(0, urlStr.length)];
	if ([matchedArr count] != 0) {
    	NSLog(@" 符合超链接模式 ");
    	return true;
	}
	else{
    	NSLog(@" 不符合超链接模式 ");
	}
	return false;
}

使用 Reachability判断url是否可以访问（排除符合超链接格式，但是并不存在的网址）

+(BOOL)isUrlReachable:(NSString*)url{
	NSLog(@" 判断url是否可以被访问 ");

	NSArray* arr = [url componentsSeparatedByString:@"://"];
	if ([arr count] <= 1) return false;
	NSString* urlSepStr = [arr objectAtIndex:1];
	if(!urlSepStr) return false;

	NSLog(@" urlSepStr is %@ ",urlSepStr);
	NSArray* arr2 = [urlSepStr componentsSeparatedByString:@"/"];
	NSString* urlSepStr2 = [arr2 objectAtIndex:0];
	if (!urlSepStr2) return false;

	Reachability* reach = [Reachability reachabilityWithHostName:urlSepStr2];
	NSInteger status = [ reach currentReachabilityStatus];
	NSLog(@" status is %ld ",(long)status);
	if (status == NotReachable) return false;

	return true;
}

判断是否为超链接并且可以访问

-(BOOL)isUrl:(NSString*)urlStr{
	if (![ self isUrlValid:urlStr]) return false;
	return [self isUrlReachable:urlStr];
}

将UILabel设置下划线 设置点击事件 = 设置为超链接

-(void)setTitleLabel:(NSString*)urlStr{

if ([self isUrl:urlStr]) {
    //变蓝 显示下划线
    self.label.textColor = [UIColor blueColor];
    NSMutableAttributedString *content = [[NSMutableAttributedString alloc] initWithString:self.label.text];
    NSRange contentRange = {0, [content length]};
    [content addAttribute:NSUnderlineStyleAttributeName value:[NSNumber numberWithInteger:NSUnderlineStyleSingle] range:contentRange];
    self.label.attributedText = content;
    //添加点击事件
    self.label.userInteractionEnabled = true;
    UITapGestureRecognizer* tapGes = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(showWebView:)];
    [self.label addGestureRecognizer:tapGes];
}
}