据我所知,为了位置/布局定制层,你应该继承您的ImageView和实施此方法:
- (void) layoutSublayersOfLayer:(CALayer*)layer
{
[super layoutSublayersOfLayer:layer];
self.customlayer.position = CGPointMake(
self.bounds.size.width/2, self.bounds.size.height/2);
}
如果你不想继承ImageView的,你可以试试这条路。 此代码应该位于您的imageview控制器中:
- (void) viewDidLoad
{
[super viewDidLoad];
self.container = [CALayer layer];
self.container.bounds = self.imageview.bounds;
self.container.delegate = self;
[self.container addSublayer:self.customlayer];
[self.imageview.layer addSublayer:self.container];
}
- (void) layoutSublayersOfLayer:(CALayer*)layer // this is layers delegate method
{
if (layer == self.container)
{
self.customlayer.position = CGPointMake(self.container.bounds.size.width/2,
self.container.bounds.size.height/2);
}
}