在iOS上，UITextChecker的执行速度非常慢

Question

在iOS UITextChecker’s执行速度非常慢，我想在我的项目中添加和删除（learnWord:/unlearnWord:）大约50,000。通过这个过程，将花费超过5至6小时。有没有办法优化它？或者任何简单的替代解决方案？

我尝试了以下演示：

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    NSString *word = @"test";

    CFTimeInterval startTime1 = CACurrentMediaTime();
    BOOL hasLearnWord = [UITextChecker hasLearnedWord:word];
    CFTimeInterval endTime1 = CACurrentMediaTime();
    NSLog(@"Execution Time 1: %f, hasLearnWord: %@", endTime1 - startTime1, hasLearnWord ? @"Yes" : @"No");

    CFTimeInterval startTime2 = CACurrentMediaTime();
    [UITextChecker unlearnWord:word];
    CFTimeInterval endTime2 = CACurrentMediaTime();
    NSLog(@"Execution Time 2: %f", endTime2 - startTime2);

    CFTimeInterval startTime3 = CACurrentMediaTime();
    [UITextChecker learnWord:word];
    CFTimeInterval endTime3 = CACurrentMediaTime();
    NSLog(@"Execution Time 3: %f", endTime3 - startTime3);

    return YES;
}

结果：

2014-03-05 05:48:20.064 demo[316:60b] Execution Time 1: 0.593178, hasLearnWord: Yes
2014-03-05 05:48:20.643 demo[316:60b] Execution Time 2: 0.576586
2014-03-05 05:48:21.219 demo[316:60b] Execution Time 3: 0.575505