cocos2d视图zoom缩放

@interface GameLayer : CCLayer
{
float lastScale;
}
@end
@implementation GameLayer

-(id) init
{    
if ((self = [super init] )) 
{
lastScale = 1.f;    
UIPinchGestureRecognizer *gestureRecognizer = [[[UIPinchGestureRecognizer alloc] initWithTarget:self action:@selector(handlePinchFrom:)] autorelease];    
[[[CCDirector sharedDirector] openGLView] addGestureRecognizer:gestureRecognizer];

}
return self;
}

-(void) handlePinchFrom:(UIPinchGestureRecognizer*)recognizer
{
if([recognizer state] == UIGestureRecognizerStateBegan)
{    
lastScale = self.scale;
}
float nowScale;    
nowScale = (lastScale - 1) + recognizer.scale;    
nowScale = MIN(nowScale,2);//设置缩放上限
nowScale = MAX(nowScale,1);//设置缩放下限
self.scale = nowScale;
}

 

 

另外一种：

- (void)handlePinchFrom:(UIPinchGestureRecognizer *)recognizer {

    static float lastScale;
    if([recognizer state] == UIGestureRecognizerStateBegan) {
        // Reset the last scale, necessary if there are multiple objects with different scales
        lastScale = [recognizer scale];
        NSLog(@"lastScale:%f",lastScale);
    }
    if ([recognizer state] == UIGestureRecognizerStateBegan || 
        [recognizer state] == UIGestureRecognizerStateChanged) {
        // Constants to adjust the max/min values of zoom
        const CGFloat kMaxScale = 2.5;
        const CGFloat kMinScale = 0.3;
        const CGFloat kSpeed = 0.75;
        
        float currentScale = [[[recognizer view].layer valueForKeyPath:@"transform.scale"] floatValue];
        
        CGFloat newScale = 1 - (lastScale - [recognizer scale]) * (kSpeed); 
        NSLog(@"newScale:%f",newScale);

        newScale = MIN(newScale, kMaxScale / currentScale); 
        NSLog(@"new1:%f     kmax:%f",newScale,kMaxScale/currentScale);
        newScale = MAX(newScale, kMinScale / currentScale);
        NSLog(@"new2:%f    kmin:%f",newScale,kMinScale/currentScale);
        NSLog(@"%f",[recognizer scale]);
        CGAffineTransform transform = CGAffineTransformScale([[recognizer view] transform], 
                                                             newScale, newScale);
        [recognizer view].transform = transform;
        
        lastScale = [recognizer scale]; // Store the previous scale factor for the next pinch gesture call 
    }
}

 

转自：子山龙人

http://www.cnblogs.com/zilongshanren/archive/2011/05/03/2033620.html