ios – 在进行3D转换时,如何让CALayers使用屏幕中心作为消失点？

解决方法

- (void)viewDidLoad
{
    [super viewDidLoad];

    for (int i = 0; i < 6; i++)
    {
        CALayer *parent = [CALayer layer];
        parent.frame = CGRectMake(0,100,100);
        parent.position = CGPointMake(70 + 120*i,70);
        parent.BACkgroundColor = [[UIColor greenColor] CGColor];
        [self.view.layer addSublayer:parent];

        float width = self.view.frame.size.width/2.0;
        float offset = (width - parent.position.X);

        CALayer *layer = [CALayer layer];
        layer.frame = CGRectMake(0,40,40);
        layer.position = CGPointMake(-offset + 50,60);
        layer.BACkgroundColor = [[UIColor redColor] CGColor];
        layer.transform = CATransform3DMakeRotation(M_PI_2,1,0);

        CATransform3D tr = CATransform3DMakeTranslation(offset,0);
        CATransform3D t = CATransform3DIdentity ;
        t.m34 = -4.0f/2000.0f ;
        parent.sublayerTransform = CATransform3DConcat(t,tr);

        [parent addSublayer:layer];    
    }
}