CABasicAnimation 完成 1 个周期后回到原来的位置答案

【问题标题】：CABasicAnimation back to its original position after it finish it's 1 cycleCABasicAnimation 完成 1 个周期后回到原来的位置
【发布时间】：2014-05-22 12:24:44
【问题描述】：

不要引用CABasicAnimation returns to the original position before the next animation 和Objective-C - CABasicAnimation applying changes after animation? 和CABasicAnimation rotate returns to original position 我试过了。

below code does,bottom->top->goes left->back to it’s original position.
bottom->top->goes left->back to its original position.
I need bottom->top->goes left.bottom->top->goes left so on…

-(void)addUpDownAnimationForButton:(UILabel*)label
{
    CABasicAnimation * bottomAnimation ;
    bottomAnimation =[CABasicAnimation animationWithKeyPath:@"transform.translation.y"];
    [bottomAnimation setValue:@"animation1" forKey:@"id"];
    bottomAnimation.delegate = self;
    [UIView setAnimationDidStopSelector:@selector(animationDidStop:finished:)];
    bottomAnimation.duration = 2.0;
    bottomAnimation.fromValue = [NSNumber numberWithFloat:13];
    bottomAnimation.toValue = [NSNumber numberWithFloat:-7];
    bottomAnimation.repeatCount = 0;
    bottomAnimation.fillMode = kCAFillModeForwards;
    bottomAnimation.removedOnCompletion = NO;
    [btnSpecialForListing.titleLabel.layer addAnimation:bottomAnimation forKey:@"transform.translation.y"];
}
- (void)animationDidStop:(CAAnimation *)theAnimation2 finished:(BOOL)flag
{
    if([[theAnimation2 valueForKey:@"id"] isEqual:@"animation1"]) {
        CABasicAnimation *moveAnimation;
        moveAnimation=[CABasicAnimation animationWithKeyPath:@"transform.translation.x"];
        moveAnimation.duration=3.5;
        moveAnimation.repeatCount=0;
        moveAnimation.autoreverses=NO;
        moveAnimation.fromValue=[NSNumber numberWithFloat:0];
        moveAnimation.toValue=[NSNumber numberWithFloat:-400];
        moveAnimation.removedOnCompletion = NO;
        moveAnimation.fillMode = kCAFillModeRemoved;
        [btnSpecialForListing.titleLabel.layer addAnimation:moveAnimation forKey:@"transform.translation.x"];
    } 
}

任何帮助将不胜感激。谢谢！！

【问题讨论】：

标签： ios objective-c animation cabasicanimation

【解决方案1】：

你试过了吗？

moveAnimation.fillMode = kCAFillModeForwards;
moveAnimation.removedOnCompletion = NO;

编辑据我所知，您还可以使用具有完成块的animateWithDuration。例如：

CGRect rect = btnSpecialForListing.titleLabel.frame;
[UIView animateWithDuration:2.0 animations:^{

 rect.origin.y = -7;
 btnSpecialForListing.titleLabel.frame = rect;

} completion:^(BOOL finished){

 [UIView animateWithDuration:3.5 animation:^{
 rect.origin.x = -400;
 btnSpecialForListing.titleLabel.frame = rect;
 }];

}];

【讨论】：

是的，我做到了。但在第一个周期完成后，只有 moveAnimation 有效，即文本只向左移动。但是bottomAnimation的代码执行但不显示。
好吧，你已经将 moveAnimation 添加到 btnSpecialForListing.titleLabel.layer 那么你到底想做什么？我真的不明白
看，我有标签，我想添加从底部开始的动画（底部动画从 -7 到 -13 位置），动画 1 完成然后底部动画完成，或者你可以说当底部动画停止我们的第二个动画（moveAnimation）开始并向左移动。但是在 moveAnimation 完成后，我的文本回到原来的位置。并再次开始相同的循环。
你可以尝试取帧0,450,320,30的标签。复制上面的代码。你会明白的。
谢谢...但我得到错误 read-only variable is not assignable in rect.origin.y = -7 line and no known class method error by using animateWithDuration 方法。我正在使用 xcode 5.0

【解决方案2】：

Swift 4.2/5：

moveAnimation.fillMode = .forwards
moveAnimation.isRemovedOnCompletion = false

【讨论】：