[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