Objective-C的：

NSArray *array = [segmentedControl subviews];

[[array objectAtIndex:2] setTintColor:[UIColor redColor]];
[[array objectAtIndex:1] setTintColor:[UIColor greenColor]];    
[[array objectAtIndex:0] setTintColor:[UIColor blueColor]];

迅速：

let array = segmentedControl.subviews
array[2].tintColor = UIColor.redColor()
array[1].tintColor = UIColor.greenColor()
array[0].tintColor = UIColor.blueColor()

请注意,子视图与用户界面的顺序相反.

您可以以相同的方式自定义边框：

let array = segmentedControl.subviews
array[0].layer.borderWidth = 5 // change thickness of border
array[0].layer.cornerRadius = 4 //change corner radius