shouldRasterize

@interface ViewController ()
@property (nonatomic, weak) IBOutlet UIView *containerView;
@end

@implementation ViewController

- (UIButton *)customButton
{
  //create button
  CGRect frame = CGRectMake(0, 0, 150, 50);
  UIButton *button = [[UIButton alloc] initWithFrame:frame];
  button.backgroundColor = [UIColor whiteColor];
  button.layer.cornerRadius = 10;

  //add label
  frame = CGRectMake(20, 10, 110, 30);
  UILabel *label = [[UILabel alloc] initWithFrame:frame];
  label.text = @"Hello World";
  label.textAlignment = NSTextAlignmentCenter;
  [button addSubview:label];
  return button;
}

- (void)viewDidLoad
{
  [super viewDidLoad];

  //create opaque button
  UIButton *button1 = [self customButton];
  button1.center = CGPointMake(50, 150);
  [self.containerView addSubview:button1];

  //create translucent button
  UIButton *button2 = [self customButton];
  
  button2.center = CGPointMake(250, 150);
  button2.alpha = 0.5;
  [self.containerView addSubview:button2];

  //enable rasterization for the translucent button
  button2.layer.shouldRasterize = YES;
  button2.layer.rasterizationScale = [UIScreen mainScreen].scale;
}
@end

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