objective-c - 如何使用 NSScanner 扫描字符串

Question

我有一个看起来像这样的字符串:

#chat :hi there

我想将 : 中的所有文本扫描为字符串，因此它的结尾类似于 hi there

我已经尝试过

[[NSScanner scannerWithString:argument] scanUpToString:@":" intoString:&newarg];

但是newarg仅包含#chat。如何实现这一目标？

Answer 1

示例字符串:

#chat :Hello World,
#chat :How are you doing?

代码:

NSString *theString =   @"#chat :Hello World,\n"
                         "#chat :How are you doing?";

NSScanner *theScanner = [NSScanner scannerWithString:theString];
NSCharacterSet *seperator = [NSCharacterSet characterSetWithCharactersInString:@":"];
NSCharacterSet *newLine = [NSCharacterSet newlineCharacterSet];
NSString *theText;

while ([theScanner isAtEnd] == NO) {

    [theScanner scanUpToCharactersFromSet:seperator intoString:NULL];
    [theScanner setScanLocation: [theScanner scanLocation]+1];
    [theScanner scanUpToCharactersFromSet:newLine intoString:&theText];

    NSLog(@"%@",theText);

}

输出:

Hello World,
How are you doing?