iOS获取网络数据/路径中的文件名

 NSString * urlString = @"http://www.baidu.com/img/baidu_logo_fqj_10.gif";
     //方法一：最直接
     NSString * fileName = [urlString lastPathComponent];
     NSLog(@"fileName==%@",fileName);
     //方法二：根据字符或者字符串分割
     NSString * fileName2 = [[NSString alloc] init];
     NSArray * separatedArray = [[NSArray alloc] init];
     separatedArray = [urlString componentsSeparatedByString:@"/"];
     fileName2 = [separatedArray lastObject];
     NSLog(@"separatedArray==%@",separatedArray);
     NSLog(@"fileName2==%@",fileName2);
     //方法三:将链接看成是路劲
     NSArray * urlCom = [[NSArray alloc] initWithArray:[urlString pathComponents]];
     NSLog(@"[urlCom lastObject]===%@",[urlCom lastObject]);
     //方法四：NSRange.它在截取二进制文件的时候十分方便
     NSString * fileName3;
     NSRange range = [urlString rangeOfString:@"/" options:NSBackwardsSearch];//NSBackwardsSearch从字符串末尾开始检索
     if (range.location != NSNotFound) {
         fileName3 = [urlString substringFromIndex:range.location+];
         if ([[fileName3 lowercaseString] hasSuffix:@".gif"]) {//lowercaseString 改变字母为小写 uppercaseString改变字母切大写  capitalizedString 首字母大些转换   ·
             NSLog(@"fileName3====%@",fileName3);
         }else{

         }
     }else{

     }