Clipping subviews
Parent views don’t clip subviews to retain them within boundaries as we can see below
Code:
<![CDATA[
import UIKit
class ViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
view.backgroundColor = colorLiteral(red: 0.1019607857, green: 0.2784313858, blue: 0.400000006, alpha: 1) //use colorliteral to get a variety of color options
let newView = UIView(frame: CGRect(x: 10, y: 100, width: 300, height: 50))
let newView2 = UIView(frame: CGRect(x: 6, y: 6, width: 400, height: 100))
newView.backgroundColor = UIColor.white
newView2.backgroundColor = UIColor.black
view.addSubview(newView)
newView.addSubview(newView2)
}
}
]]>
Output:
To retain the black rectangle within the white one, we need to clip it to the borders of the latter as shown below
Code:
<![CDATA[
view.backgroundColor = colorLiteral(red: 0.1019607857, green: 0.2784313858, blue: 0.400000006, alpha: 1) //use color literal to get a variety of color options
let newView = UIView(frame: CGRect(x: 10, y: 100, width: 300, height: 50))
newView.clipsToBounds = true
let newView2 = UIView(frame: CGRect(x: 6, y: 6, width: 400, height: 100))
newView.backgroundColor = UIColor.white
newView2.backgroundColor = UIColor.black
view.addSubview(newView)
newView.addSubview(newView2)
]]>
Output:
So the black view cannot extend extend beyond the white rectangle
Tip:
The co-ordinate system here works with 0,0 starting at the top left corner and the x increases on the right and y increases as we go tot he bottom of the screen.
Each new subview’s origin starts at the top left corner of its parent view.
