以编程方式使用约束或相对大小的Swift布局

I decided to do my app programmatically without the storyboard. I added all UIElements (buttons, frames, images...) not with constraints to my project but with relative height. For example i said button.frame.height = view.frame.height / 24 button.frame.width = view.frame.width / 3 and so on...I decided to do my app programmatically without