iOS. Difference between View Frame and Bounds

What’s the difference between the frame and the bounds?

UIView frame is the rectangle described by origin point (x and y) and size (width and height). Location of frame is relative to the superview it is contained within. For example, origin point of frame rectangle is (37.5, 233.5).

UIView bounds is the rectangle described by origin point (x and y) and size (width and height).  Location of bounds is relative to its own coordinate system. For example, origin point of bounds rectangle is (0, 0).

View inside ViewController's root view

Source Code

import UIKit

class ViewController: UIViewController {
    
    @IBOutlet weak var customView: UIView!
    
    @IBOutlet weak var frameRectLabel: UILabel!
    
    @IBOutlet weak var frameOriginLabel: UILabel!
    
    @IBOutlet weak var boundsRectLabel: UILabel!
    
    @IBOutlet weak var boundsOriginLabel: UILabel!
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        print(self.customView.frame)
        print(self.customView.bounds)
        print(self.customView.frame.origin)
        print(self.customView.bounds.origin)
        
        self.frameRectLabel.text = "Frame Rect: \(self.customView.frame)"
        self.frameOriginLabel.text = "Frame Origin: \(self.customView.frame.origin)"
        self.boundsRectLabel.text = "Bounds Rect: \(self.customView.bounds)"
        self.boundsOriginLabel.text = "Bounds Origin: \(self.customView.bounds.origin)"
        
    }

}

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