Question

如何使这个复杂的动画重复和自动反转？有没有办法添加选项UIViewAnimationOptionAutoreverse | UIViewAnimationOptionRepeat到这个动画序列？

   [UIView animateWithDuration:1.0f animations:^{

        someView.frame = someFrame1;

    } completion:^(BOOL finished) {

        [UIView animateWithDuration:0.5f animations:^{

            someView.frame = someFrame2;

        } completion:nil];

    }];

Answer 1

要从第1点到第2点到第3点到第2点到第1点进行动画并重复，您可以在iOS 7及更高版本中使用animateKeyframesWithDuration：

someView.frame = frame1;
[UIView animateKeyframesWithDuration:2.0 delay:0.0 options:UIViewKeyframeAnimationOptionAutoreverse | UIViewKeyframeAnimationOptionRepeat animations:^{
    [UIView addKeyframeWithRelativeStartTime:0.0 relativeDuration:0.5 animations:^{
        someView.frame = frame2;
    }];
    [UIView addKeyframeWithRelativeStartTime:0.5 relativeDuration:0.5 animations:^{
        someView.frame = frame3;
    }];
} completion:nil];

如果使用自动布局，则可以设置约束常量的更改动画：

[UIView animateKeyframesWithDuration:2.0 delay:0.0 options:UIViewKeyframeAnimationOptionAutoreverse | UIViewKeyframeAnimationOptionRepeat animations:^{
    [UIView addKeyframeWithRelativeStartTime:0.0 relativeDuration:0.5 animations:^{
        topConstraint.constant = 200;
        leftConstraint.constant = 200;
        [self.view layoutIfNeeded];
    }];
    [UIView addKeyframeWithRelativeStartTime:0.5 relativeDuration:0.5 animations:^{
        topConstraint.constant = 100;
        leftConstraint.constant = 300;
        [self.view layoutIfNeeded];
    }];
} completion:nil];

或者，自动布局的方法是停用约束，然后您可以使用frame值或您拥有的值进行动画处理。

在早期版本的iOS中，您可以使用CAKeyframeAnimation，例如沿路径设置动画：

UIBezierPath *path = [UIBezierPath bezierPath];
[path moveToPoint:CGPointMake(100.0, 100.0)];
[path addLineToPoint:CGPointMake(200.0, 200.0)];
[path addLineToPoint:CGPointMake(100.0, 300.0)];

CAKeyframeAnimation *animatePosition = [CAKeyframeAnimation animationWithKeyPath:@"position"];
animatePosition.path = [path CGPath];
animatePosition.duration = 1.0;
animatePosition.autoreverses = YES;
animatePosition.repeatCount = HUGE_VALF;
[self.someView.layer addAnimation:animatePosition forKey:@"position"];

你可以用你想要的许多点来做到这一点。如果您想沿弯曲路径（例如圆形或贝塞尔曲线）设置动画，这也是一种有用的技术。

要仅在两点之间制作动画，您可以使用animateWithDuration:delay:options:animations:completion:，例如：

[UIView animateWithDuration:0.5
                      delay:0.0
                    options:UIViewAnimationOptionAutoreverse | UIViewAnimationOptionRepeat | UIViewAnimationOptionCurveEaseInOut
                 animations:^{
                     // do whatever animation you want, e.g.,

                     someView.frame = someFrame1;
                 }
                 completion:NULL];

这会将someView从起始帧移动到someFrame1并返回。

顺便说一句，将UIViewAnimationOptionCurveEaseInOut与UIViewAnimationOptionAutoreverse和UIViewAnimationOptionRepeat结合使用可以在动画反转和重复时为您提供更流畅的效果。

Answer 2

Swift 4用于简单的摆动序列：

func animateWiggle() {
    // Set animation props
    let scaleDelta = CGFloat(0.10)

    // Set transforms
    let wiggleOutHorizontally = CGAffineTransform(scaleX: 1.0 + scaleDelta, y: 1.0)
    let wiggleOutVertically = CGAffineTransform(scaleX: 1.0, y: 1.0 + scaleDelta)

    // Run animation sequence
    UIView.animateKeyframes(withDuration: 1.0, delay: 0.0, options: [.autoreverse, .repeat], animations: {
        // Animate wiggle horizontally
        UIView.addKeyframe(withRelativeStartTime: 0.0, relativeDuration: 0.5, animations: {
            self.transform = wiggleOutHorizontally
        })

        // Animate wiggle vertically
        UIView.addKeyframe(withRelativeStartTime: 0.5, relativeDuration: 0.5, animations: {
            self.transform = wiggleOutVertically
        })
    },
    completion: nil)
}

Answer 3

    UIImageView *pin = [UIImageView new];
    [pin setFrame:CGRectMake(115, 160, 30, 60)];
    [pin setBackgroundColor:[UIColor redColor]];
    [holderView addSubview:pin];

    [UIView animateWithDuration:1.0 delay:0.0 options:UIViewAnimationOptionAutoreverse | UIViewAnimationOptionRepeat
                     animations:^{
                        // [pin setTransform:CGAffineTransformMakeTranslation(0, 20)];
                         [pin setFrame:CGRectMake(115, 200, 60, 100)];
                     }completion:^(BOOL finished){

                     }];

如何使UIView动画序列重复和自动反转

3 个答案: