Button border color - Objective C - Swift

Question

I want to change my border color to a specific hex color(#21CE99), can you guys please help me?

I\'ve already known how to change it to a basic color, for example:

Answer 1

_button.layer.borderColor = [UIColor colorWithRed:33.0 / 255.0 green:206.0 / 255.0 blue:153.0 / 255.0 alpha:1.0].CGColor;

Answer 2

easier

_button.layer.borderColor = [UIColor colorWithRed:0x21 / 255.0 green:0xce / 255.0 blue:0x99 / 255.0 alpha:1.0].CGColor;

Answer 3

The correct answer for people using SWIFT 4 would be:

_button.layer.borderColor = UIColor(red: 33/255, green: 206/255, blue: 153/255, alpha: 1.0).cgColor

Built-In UIColors Presets or your own colors:

_button.layer.borderColor = UIColor.blue.cgColor