查找URL是否有效并且是否存在？ [英] Finding whether a URL is valid and does it exists?

问题描述

我想知道网址即时提供是否有效，以及网上是否存在..

I want to find that whether the URL im giving is valid or not, and whether it exists in internet or not..

有没有办法做到这一点使用objective-C？

Is there any way to do that using objective-C?

推荐答案

通过执行以下操作，您可以查看URL是否有效：

You can see if a URL is valid or not by doing the following:

NSString *urlString = ... // some URL to check
NSURL *url = [NSURL URLWithString:urlString];
if (url) {
    // valid URL (meaning it is the proper format)
}

要查看Internet中是否存在URL，您需要执行HEAD请求并检查结果。这比加载URL的所有数据更有效。

To see if the URL exists in the Internet, you need to perform a HEAD request and check the result. This is more efficient than loading all of the data for the URL.

NSMutableURLRequest request = [NSMutableURLRequest requestWithURL:inURL];
[request setHTTPMethod:@"HEAD"];

NSURLConnection connection = [NSURLConnection connectionWithRequest:request delegate:self];


- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response {
    if ([(NSHTTPURLResponse *)response statusCode] == 200) {
        // url exists
    }
}

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