NSScanner扫描字符串中()的内容

//本事例去除小括号及其内部的内容

+ (NSString *)changeStringWithString:(NSString *)string

{

 NSScanner*scanner = [NSScanner scannerWithString:string];

 NSString*str =nil;

 while([scanner isAtEnd]==NO)

 {

 //找到"("的起始位置

 [scanner scanUpToString:@"("intoString:nil];

 //找到")"的结束位置

 [scanner scanUpToString:@")"intoString:&str];

 }

 NSString *lastString = [str stringByAppendingString:@")"];

 return lastString;

}