用CGPoint（）的viewDidLoad UIView

Question

I want to create my own custom segue animation in which I want to make presenting VC appear from the button.origin at size(1,1) and shift to CGPoint(0,0) and stretch to full screen size.

VC1 segues to VC2 and passes VC1 's button.frame via

override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
    let PVC = segue.destinationViewController as VC2
    PVC.CGstart = button.frame.origin}

in VC2 I have

@IBOutlet var VC4: UIView!

var CGstart = CGPoint()

override func viewDidLoad() {
    super.viewDidLoad()
    VC4.frame.origin = CGstart
}

@IBAction func DragTest(sender: UIButton) {
    VC4.frame.origin = CGstart
    println(CGstart)
}

the viewDidLoad does not adjust VC4 's frame.origin....while my @IBAction func DragTest does

Why is this? I've tried so many different variations.

Answer 1

Try moving the origin setting to viewWillAppear .

override func viewWillAppear() {
    super.viewWillAppear()
    VC4.frame.origin = CGstart
}

Answer 2

This solved the issue.

override func viewDidLoad() {
    super.viewDidLoad()
    self.view.layoutIfNeeded()
    VC4.frame.origin = CGstart
}

no need for viewDidAppear or layoutSubviews .