您可以在NSView上设置根层的anchorPoint吗?

问题描述

是否可以修改层支持的NSView的根CALayer上的anchorPoint属性?

Is it possible to modify the anchorPoint property on the root CALayer of a layer-backed NSView?

我有一个名为myView的视图，似乎每次设置anchorPoint时，它都会在下一个运行循环中被覆盖.我正在这样做:

I have a view called myView and it seems every time I set the anchorPoint, it gets overridden in the next run loop. I am doing this:

NSView *myView = [[myView alloc] initWithFrame:CGRectMake(0, 0, 50, 50)];

//set the root layer
myView.layer = [CALayer layer];
myView.wantsLayer = YES;

//gets overridden on the next run loop
myView.layer.anchorPoint = CGPointMake(1,1);

推荐答案

基本上，它会将锚点从[0.5,0.5]设置为[0,0]，为此我使用了类似的方法:

Basically it will set the anchor to [0,0] from [0.5,0.5], to account for this i uses something like :

+(void) accountForLowerLeftAnchor:(CALayer*)layer
{
    CGRect frame = layer.frame;
    CGPoint center = CGPointMake(CGRectGetMidX(frame), CGRectGetMidY(frame));
    layer.position = center;
    layer.anchorPoint = CGPointMake(0.5, 0.5);
}

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