iOS-判断URL是否可用,判断网址是否正确

来源：互联网发布：淘宝9.9包邮网编辑：程序博客网时间：2024/05/20 18:45

思路:传入一个请求的URL,进行网络请求,如果返回失败信息则说明此URL不可用
1.首先进行第一步判断传入的字符串是否符合HTTP路径的语法规则,即”HTTPS://” 或 “HTTP://” ,从封装的一个函数,传入即可判断

- (NSURL *)smartURLForString:(NSString *)str{    NSURL *     result;    NSString *  trimmedStr;    NSRange     schemeMarkerRange;    NSString *  scheme;    assert(str != nil);    result = nil;    trimmedStr = [str stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceCharacterSet]];    if ( (trimmedStr != nil) && (trimmedStr.length != 0) ) {        schemeMarkerRange = [trimmedStr rangeOfString:@"://"];        if (schemeMarkerRange.location == NSNotFound) {            result = [NSURL URLWithString:[NSString stringWithFormat:@"http://%@", trimmedStr]];        } else {            scheme = [trimmedStr substringWithRange:NSMakeRange(0, schemeMarkerRange.location)];            assert(scheme != nil);            if ( ([scheme compare:@"http"  options:NSCaseInsensitiveSearch] == NSOrderedSame)                || ([scheme compare:@"https" options:NSCaseInsensitiveSearch] == NSOrderedSame) ) {                result = [NSURL URLWithString:trimmedStr];            } else {                // It looks like this is some unsupported URL scheme.            }        }    }    return result;}

第二步,判断此路径是否能够请求成功,直接进行HTTP请求,观察返回结果->

//判断-(void) validateUrl: (NSURL *) candidate {    NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:candidate];    [request setHTTPMethod:@"HEAD"];    NSURLSession *session = [NSURLSession sessionWithConfiguration:[NSURLSessionConfiguration defaultSessionConfiguration]];    NSURLSessionDataTask *task = [session dataTaskWithRequest:request completionHandler:^(NSData * _Nullable data, NSURLResponse * _Nullable response, NSError * _Nullable error) {        NSLog(@"error %@",error);        if (error) {            NSLog(@"不可用");        }else{            NSLog(@"可用");        }    }];    [task resume];}

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