Some minor notes in iOS small projects (about UIColor color and UIButton circular buttons)

1. When using UIColor

I used the above method and found that there was no effect at all. Later I found that the values of red, green, and blue were all 0 ~ 1. After the attempt, it is found that the following usage is correct:

Divide each value by 255.0 to get a value ranging from 0 ~ 1. 2. When using UIButton, set the rounded corner as follows:

In this way, you can set any rounded corner, as long as you can make a circular Button, as long as the frame of this Button is a square, cornerRadius is set to half the length of the square side.