@property (strong, nonatomic) IBOutletCollection(UILabel) NSArray *customLabels;

for (UILabel *label in customLabels) {
        label.layer.cornerRadius = 5.0;
    }

UIButton *button = [UIButton buttonWithType:UIButtonTypeRoundedRect];

// be sure to do this step or you won't see your button
button.frame = CGRectMake(...);

// Customize your button here

[self.view addSubview:button