查找字符串的子字符串范围

Question

我试图弄清楚如何在字符串中获取一系列子字符串.按范围我的意思是子串开始的位置和结束的位置.所以,如果我有以下字符串示例:

NSString *testString=@"hello everyone how are you doing today?Thank you!";

如果我要查找的子字符串(在这个例子中)是"你好吗",那么起始范围应为15,结束范围应为31.

  (15, 31)

任何人都可以告诉我如何以编程方式执行此操作？谢谢!

Answer 1

您可以使用该方法-rangeOfString查找字符串中子字符串的位置.然后,您可以将范围的位置与NSNotFound进行比较,以查看字符串是否确实包含子字符串.

NSRange range = [testString rangeOfString:@"how are you doing"];

if (range.location == NSNotFound) {
    NSLog(@"The string (testString) does not contain 'how are you doing' as a substring");
}
else {
    NSLog(@"Found the range of the substring at (%d, %d)", range.location, range.location + range.length);        
}

Answer 2

这很直截了当.你说你想搜索字符串"大家好,你今天好吗？谢谢!" 因为"你好吗".

你说你需要第一个角色和最后一个角色的位置.

NSString *testString=@"hello everyone how are you doing today?Thank you!";

NSRange range = [testString rangeOfString:@"how are you doing"];

NSUInteger firstCharacterPosition = range.location;
NSUInteger lastCharacterPosition = range.location + range.length;

所以现在你有了最后两个变量.