ios - さまざまなビューの CAGradientLayer

Question

CAGradientLayerサイズの異なる複数のビューで色のグラデーションを作成したいと思います。フレームを個別に定義する方法がわかりません:

UIColor *darkOp = [UIColor colorWithRed:0.2f green:0.2f blue:0.27f alpha:1.0];
UIColor *lightOp = [UIColor colorWithRed:0.36f green:0.35f blue:0.42f alpha:1.0];

// Create the gradient
CAGradientLayer *gradient = [CAGradientLayer layer];

// Set colors
gradient.colors = [NSArray arrayWithObjects:
                   (id)darkOp.CGColor,
                   (id)lightOp.CGColor,
                   nil];
//set radius
gradient.cornerRadius = 5.0;

// Set bounds BUT just for one view size
gradient.frame = self.numberRegionView.bounds; //<-- here I can just define one frame size

// Add the gradient to one view
[self.numberRegionView.layer insertSublayer:gradient atIndex:0];

//but how to add the gradient layer to views with different sizes ???
//[self.graphRegionView.layer insertSublayer:gradient atIndex:0]; ???
//[self.barRegionView.layer insertSublayer:gradient atIndex:0];   ???

ありがとう！