是否可以仅从 NSURL 获取域和 TLD?没有www或其他什么? [英] Is it possible to just get the domain and TLD from an NSURL? No www or anything else?

问题描述

假设我有 http://www.youtube.com、http://youtube.com 和 https://www1.youtube.com/moretext.我将如何编写检查以查看所有这些网址是否都来自 youtube.com?

Say I have http://www.youtube.com, http://youtube.com, and https://www1.youtube.com/moretext. How would I write a check to see if all of those URLs are from youtube.com?

我尝试了 url.host 并且它似乎保留了 www. 和诸如此类的东西，这不是我想要的.

I tried url.host and it seems to keep the www. and whatnot, which is not what I want.

我基本上只想说:

if ([url isFromWebsite:@"youtube.com"]) {
    // Do things.
}

这可能吗?

推荐答案

这是 NSURL 上未经测试的类别，它将提供您想要的方法.

Here’s an untested category on NSURL that will provide the method you want.

@implementation NSURL (IsFromWebsite)

- (BOOL) isFromWebsite:(NSString *)domain
{
    NSArray *selfHostComponents = [[self host] componentsSeparatedByString:@"."];
    NSArray *targetHostComponents = [domain componentsSeparatedByString:@"."];

    NSInteger selfComponentsCount = [selfHostComponents count];
    NSInteger targetComponentsCount = [targetHostComponents count];
    NSInteger offset = selfComponentsCount - targetComponentsCount;

    if (offset < 0)
        return NO;

    for (NSUInteger i = offset; i < selfComponentsCount; i++) {
        if (![selfHostComponents[i] isEqualToString:targetHostComponents[i - offset]])
            return NO;
    }

    return YES;
}

@end

另一种(同样未经测试的)方法来做同样的事情，正如 Jesse Rusak 所建议的:

Another (also untested) way to do the same thing, as suggested by Jesse Rusak:

@implementation NSURL (IsFromWebsite)

- (BOOL) isFromWebsite:(NSString *)domain
{
    NSArray *selfComponents = [[self host] componentsSeparatedByString:@"."];
    NSArray *targetComponents = [domain componentsSeparatedByString:@"."];
    NSInteger sizeDifference = [selfComponents count] - [targetComponents count];

    if (sizeDifference < 0)
        return NO;

    return [[selfComponents subarrayWithRange:NSMakeRange(sizeDifference, [targetComponents count])]
            isEqualToArray:targetComponents];
}

@end

这篇关于是否可以仅从 NSURL 获取域和 TLD?没有www或其他什么?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！