iOS 获取 2 个字符串之间的字符串 [英] iOS Get String between 2 Strings

问题描述

如何在两个已知字符串之间获取字符串?例如:

How can I get a string between 2 known strings? For example:

<id> 100 </id>

我想从这个字符串中得到 100.

I want to get the 100 from this string.

我已经尝试过此代码，但它不起作用.NSLog 是:

I have try this code but it doesn´t work. The NSLog is:

<id>100

代码:

NSString *serverOutput = @"<id>100</id>";
NSRange start = [serverOutput rangeOfString:@"<id>"];
NSRange end = [serverOutput rangeOfString:@"</id>"];
NSLog(@"%@",[serverOutput substringWithRange:NSMakeRange(start.location, end.location)]);

推荐答案

你就在那里，但范围位置是开始而不是结束.所以你必须添加范围的长度.

You where nearly there, but the range location is the start of the not the end. So you have to add the length of the range.

由于您移动了字符串的开头，因此需要使用偏移量缩短长度:

Since the you moved the start of you string, you need to short the length with the offset:

NSString *serverOutput = @"<id>100</id>";
NSRange startRange = [serverOutput rangeOfString:@"<id>"];
NSRange endRange = [serverOutput rangeOfString:@"</id>"];

NSInteger start = NSMaxRange (startRange);
NSInteger length = endRange.location - startRange.length;

NSLog(@"%@", [serverOutput substringWithRange:NSMakeRange(start, length)]);

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