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我正在准备我的应用程序与 iOS 4 兼容并遇到问题，由于某种奇怪的原因，启用我的 segmentedControl 的 0 索引会导致代码调用 openDatabase 方法和 closeDatabase 方法。我一直在调试整个代码，发现只要启用了segmentedControl，就会调用这两个方法。

这里是日志的摘录：

> 2012-04-17 17:20:59.294 Abiliator[27897:11003] viewWillAppear - before database open
2012-04-17 17:20:59.296 Abiliator[27897:11003] OpenDatabase
2012-04-17 17:20:59.297 Abiliator[27897:11003] viewWillAppear - loadAppSettings
2012-04-17 17:20:59.311 Abiliator[27897:11003] viewWillAppear - getCurrentLearningSubject
2012-04-17 17:20:59.340 Abiliator[27897:11003] viewWillAppear - switchLearningBoxControl
2012-04-17 17:20:59.341 Abiliator[27897:11003] Inside switchLearningBoxControl
**2012-04-17 17:20:59.394 Abiliator[27897:11003] OpenDatabase
2012-04-17 17:21:00.566 Abiliator[27897:11003] CloseDatabase**
2012-04-17 17:21:00.567 Abiliator[27897:11003] Method abiliatorViewController - Function switchLearningBoxControl: Error preparing the statement 'library routine called out of sequence'.
2012-04-17 17:21:00.568 Abiliator[27897:11003] Method abiliatorViewController - Function switchLearningBoxControl: Error preparing the statement 'library routine called out of sequence'.
2012-04-17 17:21:00.569 Abiliator[27897:11003] Method abiliatorViewController - Function switchLearningBoxControl: Error preparing the statement 'library routine called out of sequence'.
2012-04-17 17:21:00.570 Abiliator[27897:11003] Method abiliatorViewController - Function switchLearningBoxControl: Error preparing the statement 'library routine called out of sequence'.
2012-04-17 17:21:00.570 Abiliator[27897:11003] Finished switchLearningBoxControl
2012-04-17 17:21:00.571 Abiliator[27897:11003] viewWillAppear - getQuestionFromDB
2012-04-17 17:21:00.572 Abiliator[27897:11003] CloseDatabase
2012-04-17 17:21:00.572 Abiliator[27897:11003] Failed to close the database with message 'library routine called out of sequence'.

您会看到两个后续的打开和关闭数据库方法调用。然而，我的代码没有明确调用这些，但是一些“幽灵”进程正在执行那部分代码。

相同的代码在 iOS 5 上运行得很好，完全没有问题，无论是在模拟器中还是在设备上。

任何想法，可能是什么问题？谢谢。

- (void) switchLearningBoxControl:(NSString *) mySubjectID {
const char *sql = "select count (*) from ABILIATOR_CARD where learningbox = ? and subject_id = ?";
for (NSInteger mySegment=0;mySegment < 5;mySegment++) {
    sqlite3_stmt *selectstmt;

    if(sqlite3_prepare_v2(database, sql, -1, &selectstmt, NULL) == SQLITE_OK) {
        sqlite3_bind_int(selectstmt, 1, mySegment+1);
        sqlite3_bind_text(selectstmt, 2, [mySubjectID UTF8String], -1, SQLITE_TRANSIENT);
        if (sqlite3_step(selectstmt) == SQLITE_ROW) {
            int count = sqlite3_column_int(selectstmt, 0);
            if (count < 1) {
                [self.learningBoxControl setEnabled:NO forSegmentAtIndex:mySegment];
            }
            else {
                [self.learningBoxControl setEnabled:YES forSegmentAtIndex:mySegment];
            }
        }
        else {
            [self.learningBoxControl setEnabled:NO forSegmentAtIndex:mySegment];
        }

    }
    else {
        NSLog(@"Method abiliatorViewController - Function switchLearningBoxControl: Error preparing the statement '%s'.", sqlite3_errmsg(database));
    }
    sqlite3_finalize(selectstmt);   
}
}
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1 回答 1

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在 iOS 4 setEnabled 调用 IBAction，iOS 5 没有。我在那个 IBAction 中有另一个打开，这当然会使应用程序感到困惑 :-) 不知道这种变化，因为我已经阅读了文档并且没有看到 4 到 5 之间的任何此类变化。

于 2012-06-01T10:01:57.127 回答