按钮上的半透明边框

Question

I'm trying to make a button that looks like this:

The button has

• transparent background color
• non-transparent title
• semi-transparent white border color

What's the best way to do this? I know how to achieve the first two items, but how do I get the semi-transparent white border color?

Answer 1

Use the button's layer's properties:

yourButton.layer.borderWidth = 3.0f;
yourButton.layer.borderColor = [UIColor colorWithRed:178/255.0 green:170/255.0 blue:156/255.0 alpha:0.4].CGColor;

(Change the values so it looks good, alpha makes it semi-transparent)

Also, you'll need this if you don't have the circle yet:

yourButton.layer.cornerRadius = yourButton.frame.size.width/2;

EDIT: As @holex suggested, a better way to calculate the cornerRadius is:

CGFloat radius = MIN(yourButton.frame.size.width, yourButton.frame.size.height) / 2.0
yourButton.layer.cornerRadius = radius;