ios 使用 CGAffineTransform 缩放并设置锚点
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Scale with CGAffineTransform and set the anchor
提问by hpique
If I understand correctly scaling a UIViewwith CGAffineTransformanchors the transformation to its center.
如果我理解正确缩放 a UIViewwithCGAffineTransform锚点转换到其中心。
In particular:
特别是：
self.frame = CGRectMake(0,0,100,100);
self.transform = CGAffineTransformMakeScale(2, 2);
NSLog(@"%f;%f;%f;%f", self.frame.origin.x, self.frame.origin.y, self.frame.size.width, self.frame.size.height);
Prints:
印刷：
-50;-50;200;200
How do you create a CGAffineTransform scale that uses a specific anchor point (say 0;0)?
您如何创建使用特定锚点（例如 0;0）的 CGAffineTransform 比例尺？
回答by deanWombourne
(a)
（一种）
Scale and then translate?
缩放然后翻译？
Something like :
就像是 ：
CGAffineTransform t = CGAffineTransformMakeScale(2, 2);
t = CGAffineTransformTranslate(t, width/2, height/2);
self.transform = t;
(b)
(二)
Set the anchor point (which is probably what you want really)
设置锚点（这可能是你真正想要的）
[self layer].anchorPoint = CGPointMake(0.0f, 0.0f);
self.transform = CGAffineTransformMakeScale(2, 2);
(c)
（C）
Set the center again to make sure it's in the same place?
再次设置中心以确保它在同一个地方？
CGPoint center = self.center;
self.transform = CGAffineTransformMakeScale(2, 2);
self.center = center;
回答by Mudit Bajpai
Firstly #import <QuartzCore/QuartzCore.h>and then set the anchor points of your view:
首先#import <QuartzCore/QuartzCore.h>，然后设置视图的锚点：
[[self layer] setAnchorPoint:CGPointMake(0, 0)];
