How can l set frames for 12 buttons with loop (programatically)? - swift

Question

I'm trying to make Concentration game (with matching cards) and my task is to set frames for the array of 12 UIButtons with for-loop (I tried to realize it with switches, but it wan't right as my mentor said).
So maybe you can help me with this. The code added below works correctly, but l have to escape of switch and make it works with the help of for-loop and universal formulas.
func setFrames() {
for i in 0...11{
var x = CGFloat()
var y = CGFloat()
switch i {
case 0...2:
y = 50
case 3...5:
y = (7/36 * view.bounds.height + 50);
case 6...8:
y = (7/18 * view.bounds.height + 50);
default:
y = (7/12 * view.bounds.height + 50);
}
switch i {
case 0, 3, 6, 9:
x = 1/18 * view.bounds.width; //20
case 1, 4, 7, 10:
x = 3/8 * view.bounds.width; //3/8
default:
x = 3/4 * view.bounds.width - 20;
}
buttonsArray[i].frame = CGRect(x: x, y: y, width: (1/4 * view.bounds.width), height: (1/6 * view.bounds.height))
}
}

Answer 1

You can use something like so:
func placeBtnsIn(frame: CGRect, padding: CGFloat) {
let numCols = 3
let numRows = 4
let buttonWidth = (frame.width - CGFloat(numCols - 1) * padding) / CGFloat(numCols)
let buttonHeight = (frame.height - CGFloat(numRows - 1) * padding) / CGFloat(numRows)
var x: CGFloat
var y: CGFloat
for row in 0...(numRows - 1) {
y = frame.origin.y + (buttonHeight + padding) * CGFloat(row)
for col in 0...(numCols - 1) {
x = frame.origin.x + (buttonWidth + padding) * CGFloat(col)
let button = UIButton()
button.frame = CGRect(x: x, y: y, width: buttonWidth, height: buttonHeight)
self.addSubview(button)
}
}
}
Then in your code use it like so:
placeBtnsIn(frame: yourFrame, padding: 5)
Where yourFrame is a rectangle in which buttons should be drawn, and padding is the distance between button "cells"