UIButton调整大小动画不设置动画

Question

我试图使用UIView动画使我的按钮的大小翻倍，但由于某种原因，它不起作用——大小合适，但没有动画。

应该为按钮调整大小设置动画的功能

上面的无关代码

@objc func createButtonPressed(){
//Removes the bottom stack with buttons
if let stackButton = self.view.viewWithTag(50){
stackButton.removeFromSuperview()
}
//Add the button back with half ares size
bottomHolder.addSubview(rightButton)
rightButton.setImage(nil, for: .normal)
rightButton.addTarget(self, action: #selector(anima), for: .touchUpInside)
rightButton.topAnchor.constraint(equalTo: bottomHolder.topAnchor).isActive = true
rightButton.trailingAnchor.constraint(equalTo: bottomHolder.trailingAnchor).isActive = true
rightButton.bottomAnchor.constraint(equalTo: bottomHolder.bottomAnchor).isActive = true


}
@objc func anima(){
UIView.animate(withDuration: 0.5, delay: 0, usingSpringWithDamping: 1, initialSpringVelocity: 1, options: .curveEaseOut, animations: {
self.rightButton.leadingAnchor.constraint(equalTo: self.bottomHolder.leadingAnchor).isActive = true
self.rightButton.layoutIfNeeded()
}, completion: nil)
}

下方的无关代码

Answer 1

试试这个：

let buttonFinalWidth = UIScreen.main.bounds.width
DispatchQueue.main.async {
UIView.animate(withDuration: 5.0) {
self.rightButton.widthAnchor.constraint(equalToConstant: buttonFinalWidth).isActive = true
self.view.layoutIfNeeded()
}
}