如何在iOS/Swift/Xcode中播放一次lottie动画，然后一帧接着一帧循环？

import Lottie

let animationView = AnimationView(name: "your_animation_file")

animationView.loopMode = .loop
animationView.play(fromFrame: 0, toFrame: animationView.animation!.totalFrame - 1)

view.addSubview(animationView)
animationView.translatesAutoresizingMaskIntoConstraints = false
NSLayoutConstraint.activate([
    animationView.topAnchor.constraint(equalTo: view.topAnchor),
    animationView.leadingAnchor.constraint(equalTo: view.leadingAnchor),
    animationView.trailingAnchor.constraint(equalTo: view.trailingAnchor),
    animationView.bottomAnchor.constraint(equalTo: view.bottomAnchor)
])

animationView.play()