@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