我有一个UIView,我正在使背景为圆形:
self.colourView.layer.cornerRadius = 350
self.colourView.clipsToBounds = true
视图为700乘700平方。
然后我尝试使用以下方法更改此视图的大小:
UIView.animate(withDuration: zoomLength,
delay: 0,
options: .curveEaseIn,
animations: {
self.colorViewWidth.constant = 100
self.colorViewHeight.constant = 100
self.colourView.layer.cornerRadius = 50
self.colourView.clipsToBounds = true
self.view.layoutIfNeeded()
},
completion: { finished in
})
})
这个问题是视图的角半径立即切换到50。因此,当视图缩小时,它看起来不像一个圆形收缩,而是一个圆角的正方形,直到它达到100×100的大小。
如何在动画期间保持圆圈形状的同时拍摄出圆形并收缩的视图。
答案 0 :(得分:3)
您可以随时使用UIView动画旁边的CABasicAnimation为角半径设置动画。见下面的例子。
import UIKit
class ViewController: UIViewController {
//cause 'merica
var colorView = UIView()
var button = UIButton()
var colorViewWidth : NSLayoutConstraint!
var colorViewHeight : NSLayoutConstraint!
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
colorView.frame = CGRect(x: 0, y: 0, width: 750, height: 750)
colorView.center = self.view.center
colorView.backgroundColor = .blue
colorView.layer.cornerRadius = 350
colorView.clipsToBounds = true
colorView.layer.allowsEdgeAntialiasing = true
colorView.translatesAutoresizingMaskIntoConstraints = false
//set up constraints
colorViewWidth = NSLayoutConstraint(item: colorView, attribute: .width, relatedBy: .equal, toItem: nil, attribute: .notAnAttribute, multiplier: 1, constant: 750)
colorViewWidth.isActive = true
colorViewHeight = NSLayoutConstraint(item: colorView, attribute: .height, relatedBy: .equal, toItem: nil, attribute: .notAnAttribute, multiplier: 1, constant: 750)
colorViewHeight.isActive = true
self.view.addSubview(colorView)
colorView.centerXAnchor.constraint(equalTo: self.view.centerXAnchor).isActive = true
colorView.centerYAnchor.constraint(equalTo: self.view.centerYAnchor).isActive = true
//button for action
button = UIButton(frame: CGRect(x: 0, y: 0, width: self.view.bounds.width - 20, height: 50))
button.center = self.view.center
button.center.y = self.view.bounds.height - 70
button.addTarget(self, action: #selector(ViewController.pressed(sender:)), for: .touchUpInside)
button.setTitle("Animate", for: .normal)
button.setTitleColor(.blue, for: .normal)
self.view.addSubview(button)
}
func pressed(sender:UIButton) {
self.colorViewWidth.constant = 100
self.colorViewHeight.constant = 100
UIView.animate(withDuration: 1.0,
delay: 0,
options: .curveEaseIn,
animations: {
self.view.layoutIfNeeded()
},
completion: { finished in
})
//animate cornerRadius and update model
let animation = CABasicAnimation(keyPath: "cornerRadius")
animation.duration = 1.0
//super important must match
animation.timingFunction = CAMediaTimingFunction(name: kCAMediaTimingFunctionEaseIn)
animation.fromValue = colorView.layer.cornerRadius
animation.toValue = 50
colorView.layer.add(animation, forKey: nil)
//update model important
colorView.layer.cornerRadius = 50
}
}
答案 1 :(得分:0)
尝试将您的图片放入viewDidLayoutSubviews()
override func viewDidLayoutSubviews() {
super.viewDidLayoutSubviews()
colourView.layer.cornerRadius = colourView.frame.size.width/2
colourView.layer.masksToBounds = true
colourView.layer.borderWidth = 3.0
colourView.layer.borderColor = UIColor(red: 142.0/255.5, green: 142.0/255.5, blue: 142.0/255.5, alpha: 1.0).cgColor
}
让我知道它是怎么回事
干杯
答案 2 :(得分:0)
关于动画,您需要创建function charChange(char){
for (var i=0; i<char.length; i++){
var char2=charCodeAt(char[i])+32;
var char3=String.fromCharCode(char2);
if (char3 !== charCodeAt(97-122){
alert("Please enter only letters in the function")
}
}
return char;
}
对象,然后设置图层对象的CAShapeLayer
。
cgpath
以上将为您绘制圆圈。之后,您可以在let circleLayer = CAShapeLayer()
let radius = view.bounds.width * 0.5
//Value of startAngle and endAngle should be in the radian.
let path = UIBezierPath(arcCenter: center, radius: radius, startAngle: startAngle, endAngle: endAngle, clockwise: true)
circleLayer.path = path.cgPath
对象上应用动画。
layer