objective-c - 使用 nsscanner 类扫描字符串

Question

我要扫描这个字符串

"hello I am emp 1313 object of string class 123"

所以在这里我想知道它们是否存在任何整数值，如果存在我想为此显示它们我正在使用 NSScanner 类，这是我的代码 View

NSString *str = @" hello I am emp 1313 object of string class 123";

NSString *limit = @" object";
NSScanner *scanner = [NSScanner scannerWithString:str];

int i;
[scanner scanInt:&i];
NSString *output;
[scanner scanUpToString:limit intoString:&output];
NSLog(@"%d",i);

但问题是我做不到，我只想使用 NSScanner 类，所以各位专家能否就此给我一些建议......

Answer 1

试一试:

NSString *str = @" hello i am emp 1313 object of string class 123";
NSScanner *scanner = [NSScanner scannerWithString:str];

// set it to skip non-numeric characters
[scanner setCharactersToBeSkipped:[[NSCharacterSet decimalDigitCharacterSet] invertedSet]];

int i;
while ([scanner scanInt:&i])
{
    NSLog(@"Found int: %d",i);
}

// reset the scanner to skip numeric characters
[scanner setScanLocation:0];
[scanner setCharactersToBeSkipped:[NSCharacterSet decimalDigitCharacterSet]];

NSString *resultString;
while ([scanner scanUpToCharactersFromSet:[NSCharacterSet decimalDigitCharacterSet] intoString:&resultString]) {
    NSLog(@"Found string: %@",resultString);
}

输出:

2010-10-27 14:40:39.137 so[2482:a0f] Found int: 1313
2010-10-27 14:40:39.140 so[2482:a0f] Found int: 123
2010-10-27 14:40:39.141 so[2482:a0f] Found string:  hello i am emp 
2010-10-27 14:40:39.141 so[2482:a0f] Found string:  object of string class