What is the UITextField default borderColor in iOS8?

According to the Mac's Digital Color Meter the RGB of the borders is 230, 230, 230.

I set the border color for the button to be the standard light gray and the border width to be 0.25 and that matched

Swift 3:

myButton.layer.borderWidth = 0.25
myButton.layer.borderColor = UIColor.lightGray.cgColor

You can use the following code to apply same effect of textfield to buttton (borderwidth, bordercolor, & corner radius)

UIColor *borderColor = [UIColor colorWithRed:204.0/255.0 green:204.0/255.0 blue:204.0/255.0 alpha:1.0];

dateButton.layer.borderColor = borderColor.CGColor;   
dateButton.layer.borderWidth = 1.0;
dateButton.layer.cornerRadius = 5.0;