iOS — How to scale the UIView with left top point?

Question

I want to fix a point (left top point) and scale (zoom out) the UIView according to the point

like this image

Now I use self.transform = CGAffineTransformMakeScale( 0.7 , 0.7); to scale the UIView , But it only can scale the UIView according to the center point

Edit

I try to use set anchorPoint with (0,0) but the view position be wrong

Answer 1

使用anchorPoint属性：

self.layer.anchorPoint = CGPointMake(0.0, 0.0);

Answer 2

尝试设置图层container!.layer.anchorPoint = CGPoint(x: 0, y: 0) anchorPoint container!.layer.anchorPoint = CGPoint(x: 0, y: 0)