將UILabel或UITextView中的文字設置爲超連接

將UILabel或UITextView中的文字設置爲超連接

判斷是否符合超連接格式

-(BOOL)isUrlValid:(NSString*)urlStr{
    NSLog(@" 判斷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(@" 符合超連接模式 ");
        return true;
    }
    else{
        NSLog(@" 不符合超連接模式 ");
    }
    return false;
}

使用 Reachability判斷url是否能夠訪問（排除符合超連接格式，可是並不存在的網址）

+(BOOL)isUrlReachable:(NSString*)url{
    NSLog(@" 判斷url是否能夠被訪問 ");

    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;
}

判斷是否爲超連接而且能夠訪問

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

將UILabel設置下劃線 設置點擊事件 = 設置爲超連接

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

if ([self isUrl:urlStr]) {
    //變藍 顯示下劃線
    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;
    //添加點擊事件
    self.label.userInteractionEnabled = true;
    UITapGestureRecognizer* tapGes = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(showWebView:)];
    [self.label addGestureRecognizer:tapGes];
}
}