[iphone-cocos2d]关于Loading的若干处理和讨论

找了些关于loading的资源，贴出来慢慢看。


(id) init

{

    self = [super init];

    if ( self )

    {   

        // Add the Label (in cocos2D universe)

        BitmapFontAtlas *label = [BitmapFontAtlas 
         bitmapFontAtlasWithString: @"Initializing Game" 
         fntFile: @"comic_atlas.fnt" 
         alignment: UITextAlignmentCenter];

        label.position = ccp(240, 160);

        label.opacity = 0;

        [self addChild: label z: 0 tag: kInitializingLabel];

        

        // Add the UIActivityIndicatorView (in UIKit universe)

        self.activityIndicatorView = [[[UIActivityIndicatorView alloc] 
          initWithActivityIndicatorStyle: 
          UIActivityIndicatorViewStyleWhiteLarge] autorelease];

        activityIndicatorView.center = ccp(190,240);

        [activityIndicatorView startAnimating];

        [[self battleView] addSubview: activityIndicatorView];

        

        [self schedule: @selector(loadingInit)];

        

        // At this point, the cocos2d rendering is fine.

    }

    

    return self;

}



- (void) loadingInit

{

    [self unschedule: @selector(loadingInit)];

    

    // Fade in nicely

    BitmapFontAtlas *label = (BitmapFontAtlas*)[self getChildByTag: kInitializingLabel];

    [label runAction: [FadeIn actionWithDuration: .25]];

    

    [self schedule: @selector(loadingStep0) interval: .25];

}



- (void) loadingStep0

{

    [self unschedule: @selector(loadingStep0)];

    

    // Add you own code to load texture, sounds etc...

    // The cocos2D thread will be waiting (since it's the same as 
       the main thread) but the UIKit thread will keep running in parallel
    // Can do multiple steps or just one

    [self schedule: @selector(loadingStep1) interval: .5];

}



- (void) loadingStep1

{

    [self unschedule: @selector(loadingStep1)];

    

    // Add you own code to load texture, sounds etc...

    

    [self schedule: @selector(loadingDone) interval: .1];

}



- (void) loadingDone

{

    gameIsReady = YES;

    

    [self.activityIndicatorView removeFromSuperview];

    

    BitmapFontAtlas *label = (BitmapFontAtlas*)[self getChildByTag: kInitializingLabel];

    [label setString: NSLocalizedString(@"Tap to start!", nil)];

    

    [label runAction: [RepeatForever actionWithAction: 

                       [Sequence actionOne: [EaseInOut actionWithAction: 
                       [MoveTo actionWithDuration: .6 position: ccp(210, 160)] rate: 2] 
                       two: [EaseInOut actionWithAction: 
                       [MoveTo actionWithDuration: .6 position: ccp(270, 160)] rate: 2]
                        ]       

                       ]

     ];

    

}



- (BOOL)ccTouchesEnded:(NSSet *)touches withEvent:(UIEvent *)event

{

    if ( gameIsReady )

    {

        [self openGame];

    }

    

    return kEventHandled;

}

2。
CGRect texRect = CGRectMake( (barPngWidth/2)*(1-loadPercentage), 0, barPngWidth/2, barPngHeight);
[barAtlasSprite setTextureRect:textRect];

My loadPercentage var should be comprised between 0 and 1. 
You definitely don't have to use an animation nor the setDisplayFrame function.


3。http://stackoverflow.com/questions/1133123/multi-threaded-opengl-programming-in-cocos2d-iphone