objective-c - UIApplication openURL : doesn't work with relative URLs

Question

代码如下:

NSURL *newsUrl = [NSURL URLWithString:@"/Document/News/1593" relativeToURL:[NSURL URLWithString:@"http://exist.ru"]];

// Outputs "http://exist.ru/Document/News/1593"
NSLog(@"%@", [newsUrl absoluteString]);

// works
[[UIApplication sharedApplication] openURL:[NSURL URLWithString:[newsUrl absoluteString]]];

// doesn't work
//[[UIApplication sharedApplication] openURL:newsUrl];

是苹果的bug吗？

Answer 1

在我的 NSLog(@"NEW %@", newUrl) 的 Xcode 输出中，我将 newUrl 声明为

NSURL *newsUrl = [NSURL URLWithString:@"/Document/News/1593" relativeToURL:[NSURL URLWithString:@"http://exist.ru"]]:

NSLog 输出为

/Document/News/1593 -- http://exist.ru

但对于 [newsUrl absoluteString]

NSLog 输出为

http://exist.ru/Document/News/1593

所以我猜想 [URLWithString: relativeToURL:] 会以不同的格式为您提供 URL。这就是您的结果无效的原因。