iOS获取/删除url中的参数

1.获取URL中的某个参数：

- (NSString *)getParameter:(NSString *)parameter urlStr:(NSString *)url {
 
    NSError *error;
 
    if (!url) {
 
        return@"";
 
    }
 
    NSString *regTags = [[NSString alloc] initWithFormat:@"(^|&|\\?)+%@=+([^&]*)(&|$)",parameter];
 
    NSRegularExpression *regex = [NSRegularExpression regularExpressionWithPattern:regTags options:NSRegularExpressionCaseInsensitive error:&error];
 
    NSArray *matches = [regex matchesInString:url options: range:NSMakeRange(, [url length])];
 
    for (NSTextCheckingResult *match in matches) {
 
        NSString *tagValue = [url substringWithRange:[match rangeAtIndex:]]; //分组2所对应的串
 
        return tagValue;
 
    }
 
    return@"";
 
}

2.删除URL中的某个参数：

- (NSString *)deleteParameter:(NSString *)parameter WithOriginUrl:(NSString *)originUrl {
 
    NSString *finalStr = [NSString string];
 
    NSMutableString * mutStr = [NSMutableString stringWithString:originUrl];
 
    NSArray *strArray = [mutStr componentsSeparatedByString:parameter];
 
    NSMutableString *firstStr = [strArray objectAtIndex:];
 
    NSMutableString *lastStr = [strArray lastObject];
 
    NSRange characterRange = [lastStr rangeOfString:@"&"];
 
    if (characterRange.location !=NSNotFound) {
 
        NSArray *lastArray = [lastStr componentsSeparatedByString:@"&"];
 
        NSMutableArray *mutArray = [NSMutableArray arrayWithArray:lastArray];
 
        [mutArray removeObjectAtIndex:];
 
        NSString *modifiedStr = [mutArray componentsJoinedByString:@"&"];
 
        finalStr = [[strArray objectAtIndex:]stringByAppendingString:modifiedStr];
 
    } else {
 
        //以'?'、'&'结尾
        finalStr = [firstStr substringToIndex:[firstStr length] -];
 
    }
 
    return finalStr;
 
}