从字符串中提取数字:
-(void)findNumFromStr
{
NSString *originalString = @"a1b2c3d4e5f6g7h8i9j0";
NSMutableString *numberString = [[NSMutableString alloc] init];
NSString *tempStr;
NSScanner *scanner = [NSString scannerWithString:originalString];
NSCharacterSet *numbers = [NSCharacterSet characterSetWithCharactersInString:@"0123456789"];
while(![scanner isAtEnd]){
[scanner scanUpToCharactersFromSet:numbers intoString:NULL];
[scanner scanCharactersFromSet:numbers intoString:&tempStr];
[numberString appendString:tempStr];
tempStr = @"";
}
int number = [numberString integerValue];
return number;
}
