android - Jetpack Compose 中图像的无限旋转

Question

如何让我的图像无限旋转？
这是我的代码，但动画不起作用

 val angle: Float by animateFloatAsState(
            targetValue = 360F,
            animationSpec = infiniteRepeatable(
                tween(2000))
        )
        Image(
            painter = painterResource(R.drawable.sonar_scanner),
            "image",
            Modifier
                .fillMaxSize()
                .rotate(angle),
            contentScale = ContentScale.Fit
        )

Answer 1

您可以使用 InfiniteTransition 使用 rememberInfiniteTransition .
就像是

val infiniteTransition = rememberInfiniteTransition()
val angle by infiniteTransition.animateFloat(
    initialValue = 0F,
    targetValue = 360F,
    animationSpec = infiniteRepeatable(
        animation = tween(2000, easing = LinearEasing)
    )
)

只是一个注释。
而不是使用

Modifier.rotate(angle)

您可以使用

     Modifier
        .graphicsLayer {
            rotationZ = angle
        }

正如您可以查看文档:

Prefer this version when you have layer properties backed by a androidx.compose.runtime.State or an animated value as reading a state inside block will only cause the layer properties update without triggering recomposition and relayout.