Yes you can do that. Have a look at this example that will answer both your questions.
First of all you need to add a UIView
called myView and attach it to an IBOutlet
ivar.
Define this global values for demonstration purposes:
#define POSITION CGPointMake(50.0,50.0)
#define SIZE CGSizeMake(100.0,100.0)
Declare two methods, one that will draw a shape in myView and another one that will resize the view to adapt it to the drawn shape:
-(void) circle
{
CAShapeLayer *layerData = [CAShapeLayer layer];
layerData.fillColor = [UIColor greenColor].CGColor;
UIBezierPath * dataPath = [UIBezierPath bezierPathWithOvalInRect:CGRectMake(0.0, 0.0, SIZE.width, SIZE.height)];
layerData.path = dataPath.CGPath;
layerData.position = CGPointMake(POSITION.x, POSITION.y);
[myView.layer addSublayer:layerData];
}
-(void) resize
{
((CAShapeLayer *)[myView.layer.sublayers objectAtIndex:0]).position = CGPointMake(0.0, 0.0);
myView.frame = CGRectMake(POSITION.x + myView.frame.origin.x , POSITION.y + myView.frame.origin.y, SIZE.width, SIZE.height);
}
Finally, in viewWillAppear:
call both methods:
- (void)viewWillAppear:(BOOL)animated
{
[super viewWillAppear:animated];
[self circle];
[self resize];
}
You can run the same code calling only circle and calling both methods. In both cases the drawn circle will be at the same exact position but in the second case myView has been resized to have the same size as the drawn shape.
Hope it helps.