iphone - 在方法中运行时，从 nib 加载的 View 不会更新 UILabel 的内容

Question

我在更新我创建的要在某些后台进程完成时显示的“myInfoBox”对象的内容时遇到问题。

在委托(delegate)方法中我创建了一个新的 viewController:

-(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];
}

下面是我对“myFirstViewController”的实现，它创建了一个“infoBox”类的实例(稍后我会展示它的代码):

- (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
}

我在测试中发生的事情是，当 -(void)loadMainView 方法完成时，myInfoBox 对象在屏幕上创建，然后我可以在屏幕上看到背景中的“myInfoBox”，而前面的 alertView(对于testing...) 此时屏幕有响应，我可以选择 YES，一旦我选择 Yes，委托(delegate)方法就会被调用。正如我在源文件中评论的那样，我正在使用断点监视模拟器并遵循代码，但当我仍在 - (void)userInitialSetupMainThread 方法中时，更改的标签值不会反射(reflect)出来，但是一旦它完成 View 更新使用最新设置的 .text 值!!咕噜..

此外，myInfoBox 类的源代码:

@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];
}

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Answer 1

冒着听起来毫无帮助的风险，这就是它的工作原理。如果您在主事件循环中有长时间运行的代码(即，您没有显式创建线程或类似线程)，操作系统将无法更新 UI。

要在代码运行时更新 UI，您需要使用线程、NSOperationQueue 等在后台运行复杂的操作，或者只是将其分解为更小的步骤并将控制权返回给偶尔主循环，以便可以更新 UI。