如何使用CABasicanimation縮放圖像

Question

[UIView animateWithDuration:0.5 animations:^{ 
    imageView.frame = self.view.bounds; 

} completion:^(BOOL finished) {}]; 

如何使用CABasicanimation編寫此代碼。下面

Answer 1

是簡單的實現

-(void)StartAnmation { 
      [subview.layer addAnimation:[self ZoomAnimation] forKey:@"Zoom"]; 
} 

-(CAAnimationGroup *)ZoomAnimation { 
    CAAnimationGroup *ZoomAnimation = [CAAnimationGroup animation]; 
    CABasicAnimation *In = [self zoomIn]; 
    ZoomAnimation.animations = [NSArray arrayWithObjects: In, nil]; 
    ZoomAnimation.duration = 2.0f; 
    return ZoomAnimation; 
} 

    -(CABasicAnimation *)zoomIn { 
CABasicAnimation *ZoomInAnimation = [CABasicAnimation animationWithKeyPath:@"transform.scale"]; 
     ZoomInAnimation.beginTime = 0.0f; 
     ZoomInAnimation.fromValue = [NSNumber numberWithFloat:20.0]; 
     ZoomInAnimation.toValue = [NSNumber numberWithFloat:1.0]; 
     ZoomInAnimation.duration = 2.0f; 
     return ZoomInAnimation; 
    } 

Answer 2

對於變焦圖像可以使用的UIImageView本身完成。

請參考解答Pinch To Zoom Effect on UIImageView inside scrollView