如何解决组件消失动画偏移闪烁

问题描述

运行下面demo，点击使色块消失时，会突然出现在左上角闪烁。

@Entry
@ComponentV2
struct Index {
@Local isShow: boolean = true;

build() {
Stack() {
Stack() {
if (this.isShow) {
Row()
.width(100)
.height(100)
.backgroundColor(Color.Red)
.transition(TransitionEffect.OPACITY.animation({ duration: 150 }));
}
}
.backgroundColor(Color.Green)
}
.width('100%')
.height('100%')
.onClick(() => {
this.isShow = !this.isShow;
});
}
}
解决措施

原因是当变量置为false时，组件会从视图树中移除，导致内层Stack失去内容后位置重置到左上角，可以固定内层Stack组件的宽高来避免，示例如下：

@Entry
@ComponentV2
struct DisappearanceAnimationOffsetFlicker {
@Local isShow: boolean = true;

build() {
Stack() {
Stack() {
if (this.isShow) {
Row()
.width(100)
.height(100)
.backgroundColor(Color.Red)
.transition(TransitionEffect.OPACITY.animation({ duration: 150 }))
}
}
.width('100%')
.height('100%')
.onClick(() => {
this.isShow = !this.isShow
})
}
}
}
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