iPhone SDK:使用 NSURL 检查 URL 的有效性不起作用? [英] iPhone SDK: Check validity of URLs with NSURL not working?

问题描述

我正在尝试检查给定的 URL 是否有效，我正在这样做:

I'm trying to check if a given URL is valid and i'm doing it like this:

- (BOOL)urlIsValid:(NSString *)address {
    NSURL *testURL = [NSURL URLWithString:address];
    if (testURL == nil) {
        return NO;
    }
    else {
        return YES;
    }
}

由于如果 URL 格式错误，URLWithString"应该返回nil"，我认为这会起作用，但由于某种原因它不起作用.有人可以告诉我为什么吗?提前致谢！

Since "URLWithString" is supposed to return "nil" if the URL is malformed I thought this would work but it doesn't for some reason. Could someone please tell me why? Thanks in advance!

推荐答案

NSURLRequest *req = [NSURLRequest requestWithURL:[NSURL URLWithString:@"yourstring"]];
bool valid = [NSURLConnection canHandleRequest:req];

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