我正在尝试在 Jetpack Compose 中制作形状的晃动动画。我想在用户输入无效的 Pin 码时使用此动画来显示错误。但我能找到的只是滑入、滑出动画和一些缩放动画。我有什么想法可以做到这一点吗?
更新: 在@Thracian 回答之后。我使用如下代码,水平摇动我的物品:
fun Modifier.shake(enabled: Boolean, onAnimationFinish: () -> Unit) = composed(
factory = {
val distance by animateFloatAsState(
targetValue = if (enabled) 15f else 0f,
animationSpec = repeatable(
iterations = 8,
animation = tween(durationMillis = 50, easing = LinearEasing),
repeatMode = RepeatMode.Reverse
),
finishedListener = { onAnimationFinish.invoke() }
)
Modifier.graphicsLayer {
translationX = if (enabled) distance else 0f
}
},
inspectorInfo = debugInspectorInfo {
name = "shake"
properties["enabled"] = enabled
}
)
不幸的是,Gif 比实际动画慢,但它给出了结果的想法。
这可以通过多种方式来完成。您应该在短时间内更改scaleX或scaleY或同时更改两者以产生抖动效果。如果您希望旋转,请更改 Modifier.graphicsLayer 的rotationZ
@Composable
private fun ShakeAnimationSamples() {
Column(modifier = Modifier
.fillMaxSize()
.padding(10.dp)) {
var enabled by remember {
mutableStateOf(false)
}
val scale by animateFloatAsState(
targetValue = if (enabled) .9f else 1f,
animationSpec = repeatable(
iterations = 5,
animation = tween(durationMillis = 50, easing = LinearEasing),
repeatMode = RepeatMode.Reverse
),
finishedListener = {
enabled = false
}
)
val infiniteTransition = rememberInfiniteTransition()
val scaleInfinite by infiniteTransition.animateFloat(
initialValue = 1f,
targetValue = .85f,
animationSpec = infiniteRepeatable(
animation = tween(30, easing = LinearEasing),
repeatMode = RepeatMode.Reverse
)
)
val rotation by infiniteTransition.animateFloat(
initialValue = -10f,
targetValue = 10f,
animationSpec = infiniteRepeatable(
animation = tween(30, easing = LinearEasing),
repeatMode = RepeatMode.Reverse
)
)
Icon(
imageVector = Icons.Default.NotificationsActive,
contentDescription = null,
tint = Color.White,
modifier = Modifier
.graphicsLayer {
scaleX = if (enabled) scale else 1f
scaleY = if (enabled) scale else 1f
}
.background(Color.Red, CircleShape)
.size(50.dp)
.padding(10.dp)
)
Icon(
imageVector = Icons.Default.NotificationsActive,
contentDescription = null,
tint = Color.White,
modifier = Modifier
.graphicsLayer {
scaleX = scaleInfinite
scaleY = scaleInfinite
rotationZ = rotation
}
.background(Color.Red, CircleShape)
.size(50.dp)
.padding(10.dp)
)
Button(onClick = { enabled = !enabled }) {
Text("Animation enabled: $enabled")
}
}
}
您也可以将其作为修改器
fun Modifier.shake(enabled: Boolean) = composed(
factory = {
val scale by animateFloatAsState(
targetValue = if (enabled) .9f else 1f,
animationSpec = repeatable(
iterations = 5,
animation = tween(durationMillis = 50, easing = LinearEasing),
repeatMode = RepeatMode.Reverse
)
)
Modifier.graphicsLayer {
scaleX = if (enabled) scale else 1f
scaleY = if (enabled) scale else 1f
}
},
inspectorInfo = debugInspectorInfo {
name = "shake"
properties["enabled"] = enabled
}
)
使用方法
Icon(
imageVector = Icons.Default.NotificationsActive,
contentDescription = null,
tint = Color.White,
modifier = Modifier
.shake(enabled)
.background(Color.Red, CircleShape)
.size(50.dp)
.padding(10.dp)
)