Objective-C:子串和替换 [英] Objective-C: Substring and replace

问题描述

我有一个 NSString，它是一个 URL.这个网址需要剪掉:

I have a NSString which is a URL. This URL need to be cut:

NSString *myURL = @"http://www.test.com/folder/testfolder";
NSString *test = [myURL stringByReplacingCharactersInRange:[myURL rangeOfString:@"/" options:NSBackwardsSearch] withString:@""];

我有这个 URL http://www.test.com/folder/testfolder 并且我希望 test 变量应该具有值 http://www.test.com/folder/，所以testfolder应该被剪掉.所以我试图找到 NSRange testfolder 用空字符串替换它.

I have this URL http://www.test.com/folder/testfolder and I want that the test variable should have the value http://www.test.com/folder/, so the testfolder should be cut. So I tried to find the NSRange testfolder to replace it with an empty string.

但它不起作用.我做错了什么?

But it does not work. What I am doing wrong?

推荐答案

你可以把它变成一个 URL 并使用 -[NSURL URLByDeletingLastPathComponent]:

You can turn it into a URL and use -[NSURL URLByDeletingLastPathComponent]:

NSString *myURLString = @"http://www.test.com/folder/testfolder";
NSURL *myURL = [NSURL URLWithString:myURLString];
myURL = [myURL URLByDeletingLastPathComponent];
myURLString = [myURL absoluteString];

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