作者:飞龙在天2602911735 | 来源:互联网 | 2023-02-05 14:37
此代码在以前版本的Xcode中完美运行,但现在它没有显示任何内容.它只显示活动指示器显示"正在运行的项目"
import UIKit
import PlaygroundSupport
let cOntainer= UIView()
container.frame.size = CGSize(width: 215.0, height: 215.0)
var view = UIView()
view.frame.size = CGSize(width: 185.0, height: 185.0)
view.center = container.center
view.layer.cornerRadius = view.frame.size.height/2
view.backgroundColor = UIColor.white
container.addSubview(view)
let scaleAnimation = CABasicAnimation(keyPath: "transform.scale")
scaleAnimation.fromValue = CGFloat(0.6)
scaleAnimation.toValue = CGFloat(1.15)
scaleAnimation.timingFunction = CAMediaTimingFunction(name: kCAMediaTimingFunctionEaseOut)
scaleAnimation.isRemovedOnCompletion= false
let opacityAnimation = CABasicAnimation(keyPath: "opacity")
opacityAnimation.fromValue = CGFloat(0.0)
opacityAnimation.toValue = CGFloat(0.1)
opacityAnimation.duration = 1
opacityAnimation.isRemovedOnCompletion= false
opacityAnimation.autoreverses = true;
let circleAnimations: CAAnimatiOnGroup= CAAnimationGroup()
circleAnimations.duration = 2
circleAnimations.repeatCount = HUGE;
circleAnimations.animatiOns= [scaleAnimation, opacityAnimation];
view.layer .add(circleAnimations, forKey: "circleAnimations")
PlaygroundPage.current.liveView = container
PlaygroundPage.current.needsIndefiniteExecution = true
这有什么问题?
1> 小智..:
您需要启用助理编辑器才能查看结果.
查看>助理编辑器>显示助理编辑器
另请参见此处:
iOS Playground不显示UI预览