我是 xcode 的新手。这是我的调试说:
2012-07-22 18:40:51.787 TestSaveData[2329:fb03] Saved for number one
2012-07-22 18:40:55.159 TestSaveData[2329:fb03] Successfully load for test nombre one
2012-07-22 18:40:55.160 TestSaveData[2329:fb03] Successfully load for test number 2
2012-07-22 18:40:55.161 TestSaveData[2329:fb03] Successfully load for test number two
2012-07-22 18:40:55.161 TestSaveData[2329:fb03] Successfully load for test one
2012-07-22 18:40:55.162 TestSaveData[2329:fb03] Successfully load for test again
2012-07-22 18:40:55.163 TestSaveData[2329:fb03] Successfully load for
2012-07-22 18:40:55.164 TestSaveData[2329:fb03] Successfully load for test one
2012-07-22 18:40:55.165 TestSaveData[2329:fb03] Successfully load for test one again
2012-07-22 18:40:55.166 TestSaveData[2329:fb03] Successfully load for test one again
2012-07-22 18:40:55.166 TestSaveData[2329:fb03] Successfully load for 1
2012-07-22 18:40:55.167 TestSaveData[2329:fb03] Successfully load for (null)
2012-07-22 18:40:55.170 TestSaveData[2329:fb03] Successfully load for number one
第一行是我使用 UITextField 的输入,我写了“第一”并使用此代码使用保存按钮 1 保存它,并在我按下按钮 1 时显示它
2012-07-22 18:40:51.787 TestSaveData[2329:fb03] Saved for number one
- (IBAction)button1:(id)sender
{
TestSaveDataAppDelegate *appDelegate = [[UIApplication sharedApplication] delegate];
NSManagedObjectContext *context = [appDelegate managedObjectContext];
Highscore *record = [NSEntityDescription insertNewObjectForEntityForName:@"Highscore" inManagedObjectContext:context];
record.highscore1 = textField.text;
NSLog(@"Saved for %@", textField.text);
NSError *error;
if (![context save:&error])
{
NSLog(@"Error");
}
}
当我单击 button2 时,我的调试视图会查看我所有的旧输入数据。但在我的 UILabel 中,使用下面的这个按钮 2 只显示我的最后一个输入是“第一”
- (IBAction)button2:(id)sender
{
TestSaveDataAppDelegate *appDelegate = [[UIApplication sharedApplication] delegate];
NSManagedObjectContext *context = [appDelegate managedObjectContext];
NSFetchRequest *request = [[NSFetchRequest alloc] init];
NSEntityDescription *entity = [NSEntityDescription entityForName:@"Highscore" inManagedObjectContext:context];
[request setEntity:entity];
NSError *error;
if (![context save:&error])
{
NSLog(@"Error");
}
NSArray *array = [context executeFetchRequest:request error:&error];
for (Highscore *record in array)
{
label.text = record.highscore1;
NSLog(@"Successfully load for %@", record.highscore1);
}
}
我的问题是,我有没有可能只显示最后一个输入?在这种情况下,如果我保存“第一”并且调试只显示“第一”而不显示我的旧数据。