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

http://stackoverflow.com/questions/10468233/why-does-my-view-jump-when-setting-the-layer-anchorpoint-in-an-animation-block — luk2302, Aug 28 '15 at 08:08
You need a little more than changing the anchor point: https://www.hackingwithswift.com/example-code/calayer/how-to-change-a-views-anchor-point-without-moving-it — nalexn, Jun 10 '20 at 15:09

score 4 · Answer 1 · answered Aug 28 '15 at 07:54

4

Use anchorPoint property:

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

answered Aug 28 '15 at 07:54

ArturOlszak

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You can use CGPointZero (the same as 0,0) – SomeGuy Aug 28 '15 at 07:58

score 0 · Answer 2 · answered Aug 28 '15 at 07:56

0

Try to set anchorPoint of layer container!.layer.anchorPoint = CGPoint(x: 0, y: 0)

answered Aug 28 '15 at 07:56

tuledev

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

2 Answers2