加速数据检测器

Question

我正在使用NSDataDetector从字符串中获取地址。我打算用这种方法做大约500次，这会产生明显的延迟（iPhone 4上大约3秒）。有没有办法加快速度？我尝试将数据检测器移动到静态变量，认为设置需要时间，但没有任何区别。这是代码：

- (NSDictionary *)addressDetectorForString:(NSString *)address
{
    if (!address) return nil;

    static NSDataDetector *addressDetector = nil;
    if (!addressDetector) {
        addressDetector = [NSDataDetector dataDetectorWithTypes:NSTextCheckingTypeAddress error:nil];
    }

    NSDictionary *dictionary = nil;

    NSArray* matches = [addressDetector matchesInString:address options:0 range:NSMakeRange(0, [address length])];
    if ([matches count] > 0) {
        for (NSTextCheckingResult *match in matches) { // Only ever one result.
            if ([match resultType] == NSTextCheckingTypeAddress) {
                dictionary = [match addressComponents];
            }
        }
    }
    return dictionary;
}