iphone - 使用 CATransform3DMakeTranslation 设置的持续时间

Question

我关于堆栈溢出的第一个问题:)

我想在 CALayer 上进行 y 轴平移。我有一个大背景：320x4000px。翻译使用以下代码：

NSNumber *deplacement = [NSNumber numberWithFloat:([app.session.progression floatValue] * HAUTEUR_FOND) /100];

self.backgroundLayer.transform = CATransform3DMakeTranslation(0, -[deplacement floatValue], 0);

但是使用此代码，无法设置持续时间...

我试过了：

CABasicAnimation *transformAnimation = [CABasicAnimation animationWithKeyPath:@"position.y"];
transformAnimation.duration = 5.0f;
transformAnimation.toValue = [NSValue valueWithCATransform3D:CATransform3DMakeTranslation(0, -[deplacement floatValue], 0)];
[self.backgroundLayer addAnimation:transformAnimation forKey:@"position.y"];

但它不起作用......

感谢帮助 ：）

Answer 1

好的，这是答案，也许它会帮助某人:)

NSNumber *deplacement = [NSNumber numberWithFloat:([app.session.progression floatValue] * HAUTEUR_FOND) /100];
DebugLog(@"deplacement : %@", deplacement);

if(!backgroundPositionMemo) backgroundPositionMemo = 0;

CABasicAnimation *transformAnimation = [CABasicAnimation animationWithKeyPath:@"transform"];
transformAnimation.duration = 1.0f;
transformAnimation.fromValue = [NSValue valueWithCATransform3D:CATransform3DMakeTranslation(0, -backgroundPositionMemo, 0)];
transformAnimation.toValue = [NSValue valueWithCATransform3D:CATransform3DMakeTranslation(0, -[deplacement floatValue], 0)];
transformAnimation.removedOnCompletion = NO;
transformAnimation.fillMode = kCAFillModeForwards;
[self.backgroundLayer addAnimation:transformAnimation forKey:@"transform"];

backgroundPositionMemo = [deplacement floatValue];