UIView缩放为0使用CGAffineTransformMakeScale [英] UIView scale to 0 using CGAffineTransformMakeScale
问题描述
是否可以使用CGAffineTransformMakeScale将UIView缩放到0(宽度和高度为0)?
view.transform = CGAffineTransformMakeScale(0.0f,0.0f);
为什么会抛出<错误> ;: CGAffineTransformInvert:奇异矩阵。
?
<还有另一种将UIView缩小到0的方法。
[UIView beginAnimations:nil context:nil];
[UIView setAnimationDuration:0.3];
view.frame = CGRectMake(view.center.x,view.center.y,0,0);
[UIView commitAnimations];
有很多时候,反转您的变换矩阵。矩阵的逆是一些矩阵M',使得矩阵M和逆矩阵M'的乘积是标识矩阵I. b
$ b <1> = M * M '
零矩阵没有逆矩阵,因此出现错误消息。
Is it possible to scale a UIView down to 0 (width and height is 0) using CGAffineTransformMakeScale?
view.transform = CGAffineTransformMakeScale(0.0f, 0.0f);
Why would this throw an error of "<Error>: CGAffineTransformInvert: singular matrix.
" ?
Update: There is another way of scaling down a UIView to 0
[UIView beginAnimations:nil context:nil];
[UIView setAnimationDuration:0.3];
view.frame = CGRectMake(view.center.x, view.center.y, 0, 0);
[UIView commitAnimations];
There are lots of times when the underlying frameworks need to invert your transform matrix. The inverse of a matrix is some matrix M' such that the product of your matrix M and the inverse matrix M' is the identify matrix 1.
1 = M * M'
The zero matrix does not have an inverse, hence the error message.
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