字符串截取

本小节知识点:

  1. 【理解】字符串的截取

1.字符串的截取

  • - (NSString *)substringFromIndex:(NSUInteger)from;
    • 从指定位置from开始(包括指定位置的字符)到尾部
    NSString *str = @"<head>小码哥</head>";
    str = [str substringFromIndex:7];
    NSLog(@"str = %@", str);

输出结果: 小码哥</head>
  • - (NSString *)substringToIndex:(NSUInteger)to;
    • 从字符串的开头一直截取到指定的位置to，但不包括该位置的字符
    NSString *str = @"<head>小码哥</head>";
    str = [str substringToIndex:10];
    NSLog(@"str = %@", str);

输出结果: <head>小码哥
  • - (NSString *)substringWithRange:(NSRange)range;
    • 按照所给出的NSRange从字符串中截取子串
    NSString *str = @"<head>小码哥</head>";
    NSRange range;
    /*
    range.location = 6;
    range.length = 3;
    */
    range.location = [str rangeOfString:@">"].location + 1;
    range.length = [str rangeOfString:@"</"].location - range.location;
    NSString *res = [str substringWithRange:range];
    NSLog(@"res = %@", res);
输出结果: 小码哥

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