UiButton并将AutoresizingMaskIntoConstraints转换

Question

My question is a simple one.

I'm currently subclassing UIButton to create some custom animations. However, when I set the translatesAutoresizingMaskIntoConstraints to false , my view moves to the upper left corner. However when I set it to false OR change the class to UIView or UIControl this problem doesn't appear anymore.

Here is my code:

class ViewController: UIViewController {

override func viewDidLoad() {
    super.viewDidLoad()
    let button = TestA(frame: CGRectMake(100, 100, 100, 100))
    button.backgroundColor = UIColor.blackColor()
    self.view.addSubview(button)

    // Do any additional setup after loading the view, typically from a nib.
}

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
}
}


class TestA : UIControl {


required init?(coder aDecoder: NSCoder) {
    super.init(coder: aDecoder)
}

override init(frame: CGRect) {
    super.init(frame: frame)
}


}

Does anyone know what's going on?

Answer 1

You have position A for example and position B . For position A you have added constraints and its fixed on its place. If you just type for example button.frame = CGRectMake(0.0.100.100) it will not move from current position because it is fixed, in this case if we want to achieve movement we need to use translatesAutoresizingMaskIntoConstraints and we should set it to true, after that we have possibility to change position of UIButton . Hope it helps.