为什么我不能在喷气背包作曲中使用Modifier.sharedBounds

这是一个作用域的修饰符 SharedTransitionScope ,您只能在其中定义的作用域内调用作用域修饰符。您需要使用

SharedTransitionLayout 或 SharedTransitionScope 可堆肥物

SharedTransitionLayout {
    val sharedTransitionState = rememberSharedContentState("")

    AnimatedContent(
        targetState = visible
    ) { target ->

        Modifier.sharedBounds(
            sharedContentState = sharedTransitionState,
            animatedVisibilityScope = this@AnimatedContent
        )
    }
}

SharedTransitionScope {
    AnimatedVisibility(
        visible = visible
    ) {

        val sharedTransitionState = rememberSharedContentState("")

        Modifier.sharedBounds(
            sharedContentState = sharedTransitionState,
            animatedVisibilityScope = this@AnimatedVisibility
        )
    }
}

或直接通过 TransitionScope 如,在TransitionScope修饰符下方的示例中。

@Composable
private fun MainContent(
    onShowDetails: () -> Unit,
    modifier: Modifier = Modifier,
    sharedTransitionScope: SharedTransitionScope,
    animatedVisibilityScope: AnimatedVisibilityScope
) {
    with(sharedTransitionScope) {
        Row(
            modifier = Modifier
                .padding(8.dp)
                .sharedBounds(
                    rememberSharedContentState(key = "bounds"),
                    animatedVisibilityScope = animatedVisibilityScope,
                    enter = fadeIn(),
                    exit = fadeOut(),
                    resizeMode = SharedTransitionScope.ResizeMode.ScaleToBounds()
                )
                // ...
        ) {
            // ...
        }
    }
}

https://developer.android.com/develop/ui/compose/animation/shared-elements