Created
November 8, 2019 08:47
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/// 获取 url 的顶级域名. 比如, a.example.com 的顶级域名是 example.com | |
- (NSString *)topLevelDomainNameFromUrl:(NSURL *)url { | |
if (url.absoluteString.length == 0) { | |
return nil; | |
} | |
NSString *topLevelDomainName = @""; | |
NSString *host = url.host; | |
NSArray *subStrings = [host componentsSeparatedByString:@"."]; | |
NSUInteger count = subStrings.count; | |
if (count == 2) { | |
topLevelDomainName = host; | |
} else if (count > 2) { | |
topLevelDomainName = [NSString stringWithFormat:@"%@.%@", subStrings[count - 2], subStrings[count - 1]]; | |
} else { | |
return nil; | |
} | |
return topLevelDomainName; | |
} |
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