一部のバックグラウンドプロセスの実行中に表示されるように作成した「myInfoBox」オブジェクトのコンテンツを更新する際に問題が発生します。
デリゲートメソッドで、新しいviewControllerを作成しています。
-(void)loadMainView
{
myFirstViewController = [[MyFirstViewController alloc] initWithNibName:@"MyFirstView" bundle:nil];
navigationController = [[UINavigationController alloc] initWithRootViewController:myFirstViewController];
// myFirstViewController was retained again by the controller, release one
[myFirstViewController release];
navigationController.navigationBar.hidden = YES;
[window addSubview:navigationController.view];
[window makeKeyAndVisible];
// the next method is run after the "viewDidLoad" is finished loading
[myFirstViewController loadAlertViewForNewUser];
}
以下は、「myFirstViewController」の実装です。これにより、「infoBox」クラスのインスタンスが作成されます（コードは後で示します）。
- (void)viewDidLoad {
self.navigationController.navigationBar.frame = CGRectMake(0, 0, 0, 0);
self.navigationController.navigationBar.bounds = CGRectMake(0, 0, 0, 0);
self.myInfoBox = [[InfoBoxController alloc] initWithNibName:@"InfoBox" bundle:[NSBundle mainBundle]];
CGRect infoBoxFrame;
infoBoxFrame = CGRectMake(60, 120, 200, 200);
myInfoBox.view.frame = infoBoxFrame;
myInfoBox.i_statusLabel.text = @"Downloading Account Updates";
myInfoBox.i_titleLabel.text = @"Updating";
// disabled for testing
//myInfoBox.view.hidden = YES;
[self.view addSubview:myInfoBox.view];
[super viewDidLoad];
}
// this method is called after the view has been loaded by the delegate
- (void)loadAlertViewForNewUser
{
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Welcome!" message:@"Connect to download stuff from your account?"
delegate:self cancelButtonTitle:@"Cancel" otherButtonTitles:@"OK", nil];
alert.tag = 0;
[alert show];
}
// implementation of the alertview delegate
- (void)alertView:(UIAlertView *)actionSheet didDismissWithButtonIndex:(NSInteger)buttonIndex
{
if (actionSheet.tag == 0)
{
if (buttonIndex == 0)
{ NSLog(@"button 0 was pressed"); }
if (buttonIndex == 1)
{
// this is the button that is pressed
[actionSheet removeFromSuperview];
[actionSheet release];
// tried using this also
//[self performSelectorOnMainThread:@selector(userInitialSetupMainThread) withObject:nil waitUntilDone:NO];
// do stuff and update the infobox about it
[self loadInfoBoxInitialUserSetup];
// tried using this as well
//[self performSelectorInBackground:@selector(loadInfoBoxInitialUserSetup) withObject:nil];
}
return;
}
}
- (void)loadInfoBoxInitialUserSetup
{
[self performSelectorOnMainThread:@selector(userInitialSetupMainThread) withObject:nil waitUntilDone:NO];
}
- (void)userInitialSetupMainThread
{
// fetch JSON data
NSDictionary *responseJSON = [NSDictionary dictionaryWithDictionary:[self getUserstuff]];
self.myInfoBox.i_statusLabel.text = @"Processing Recieved information";
// breakpoint - nothing changes in the view on the simulator
[myInfoBox.view setNeedsLayout];
// breakpoint - nothing changes in the view on the simulator
[myInfoBox.view setNeedsDisplay];
// breakpoint - nothing changes in the view on the simulator
[myInfoBox.parentViewController.view setNeedsLayout];
// breakpoint - nothing changes in the view on the simulator
[myInfoBox.parentViewController.view setNeedsDisplay];
// breakpoint - nothing changes in the view on the simulator
[myInfoBox performSelectorOnMainThread:@selector(updateValuesForTitle:) withObject:@"test" waitUntilDone:YES];
// breakpoint - nothing changes in the view on the simulator
[self.view setNeedsLayout];
// breakpoint - nothing changes in the view on the simulator
[self.view setNeedsDisplay];
// breakpoint - nothing changes in the view on the simulator
self.myInfoBox.i_statusLabel.text = @"Reloading...";
// breakpoint - nothing changes in the view on the simulator
[self readStuffFromDB];
sleep(2);
//disabled view removal for testing..
//[self.myInfoBox.view removeFromSuperview];
// breakpoint - nothing changes in the view on the simulator
}
テストで私に何が起こるかというと、-（void）loadMainViewメソッドが完了するとmyInfoBoxオブジェクトが画面に作成され、alertViewが前面にあるときに（テスト用に）画面に「myInfoBox」がバックグラウンドで表示されます。 。）この時点で画面が応答し、[はい]を選択できます。[はい]を選択すると、デリゲートメソッドが呼び出されます。ソースファイルでコメントしたように、ブレークポイントを使用してシミュレーターを監視し、コードに従っていますが、-（void）userInitialSetupMainThreadメソッドを使用している間は、変更されたラベル値が反映されませんが、ビューが更新されると更新されます最新の設定された.text値で!! grrr ..
また、myInfoBoxクラスのソース：
@interface InfoBoxController : UIViewController {
IBOutlet UILabel* i_titleLabel;
IBOutlet UILabel* i_statusLabel;
IBOutlet UIImageView* i_loadingImage;
IBOutlet UIImageView* i_background;
IBOutlet UIActivityIndicatorView* i_activityIndicator;
}
@property(nonatomic, retain) IBOutlet UILabel* i_titleLabel;
@property(nonatomic, retain) IBOutlet UILabel* i_statusLabel;
@property(nonatomic, retain) IBOutlet UIImageView* i_loadingImage;
@property(nonatomic, retain) IBOutlet UIImageView* i_background;
@property(nonatomic, retain) IBOutlet UIActivityIndicatorView* i_activityIndicator;
//- (void)updateValuesForTitle:(NSString *)title Label:(NSString *)label;
- (void)updateValuesForTitle:(NSString *)title;
@end
@implementation InfoBoxController
@synthesize i_titleLabel, i_statusLabel, i_loadingImage, i_background;
@synthesize i_activityIndicator;
//-(void)updateValuesForTitle:(NSString *)title Label:(NSString *)label
-(void)updateValuesForTitle:(NSString *)title
{
self.i_titleLabel.text = title;
self.i_statusLabel.text = title;
[self.i_titleLabel setNeedsDisplay];
[self.i_statusLabel setNeedsDisplay];
}
長い投稿でごめんなさい:)助けてください！