iOS-判断输入的网址是http还是https，判断网址是否可用_ios判断域名是否可用

前言

最近做了一个项目，app内部打开连接，很多小伙伴都用得到，但是有运营小伙伴，直接输入www.XXX.com，前面没有加上http://或者https://，这样会导致请求不成功，后来查到了，话不多说上代码！

拼接http://或者https://

- (NSString *)getCompleteWebsite:(NSString *)urlStr{
    NSString *returnUrlStr = nil;
    NSString *scheme = nil;
    
    assert(urlStr != nil);
    
    urlStr = [urlStr stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceCharacterSet]];
    if ( (urlStr != nil) && (urlStr.length != 0) ) {
        NSRange  urlRange = [urlStr rangeOfString:@"://"];
        if (urlRange.location == NSNotFound) {
            returnUrlStr = [NSString stringWithFormat:@"http://%@", urlStr];
        } else {
            scheme = [urlStr substringWithRange:NSMakeRange(0, urlRange.location)];
            assert(scheme != nil);
            
            if ( ([scheme compare:@"http"  options:NSCaseInsensitiveSearch] == NSOrderedSame)
                || ([scheme compare:@"https" options:NSCaseInsensitiveSearch] == NSOrderedSame) ) {
                returnUrlStr = urlStr;
            } else {
                //不支持的URL方案
            }
        }
    }
    return returnUrlStr;
}

NSString *str = @"www.baidu.com";
    NSLog(@"%@",[self getCompleteWebsite:str]);

2016-04-08 15:40:26.818 ZFJAnimation[6100:155911] http://www.baidu.com

判断网址是否有效

判断此路径是否能够请求成功,直接进行HTTP请求

//判断此路径是否能够请求成功,直接进行HTTP请求
- (void)urliSAvailable:(NSString *)urlStr{
    NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:urlStr]];
    [request setHTTPMethod:@"HEAD"];
    NSURLSession *session = [NSURLSession sessionWithConfiguration:[NSURLSessionConfiguration defaultSessionConfiguration]];
    NSURLSessionDataTask *task = [session dataTaskWithRequest:request completionHandler:^(NSData * _Nullable data, NSURLResponse * _Nullable response, NSError * _Nullable error) {
        if (error) {
            NSLog(@"不可用");
        }else{
            NSLog(@"可用");
        }
    }];
    [task resume];
}

希望对你有所帮助！