如何使UIView的动画序列重复和自动翻转(How to make UIView animation

如何使这个复杂的动画重复和自动翻转？ 有没有什么办法来添加选项UIViewAnimationOptionAutoreverse | UIViewAnimationOptionRepeat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:

从点1动画2到3比2比1和重复，你可以使用animateKeyframesWithDuration中的iOS 7及更高版本：

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，可以动画约束常数的变化：

[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，具有自动布局方法是停用的约束，然后你可以使用动画frame值，或者你有什么。

---

在早期版本的iOS，您可以使用CAKeyframeAnimation ，例如沿路径动画：

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"];

你可以用你想要但是多点做到这一点。 如果你想沿着弯曲的路径（例如圆圈或贝塞尔曲线）动画这也有用的技术。

---

只是两点之间的动画，你可以使用animateWithDuration:delay:options:animations:completion: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];

该动画的运动someView从起始帧someFrame1和背部。

顺便说一句，使用UIViewAnimationOptionCurveEaseInOut会同UIViewAnimationOptionAutoreverse和UIViewAnimationOptionRepeat会给你一个光滑的效果动画挫折和反复。

Answer 2:

斯威夫特4简单摆动序列：

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){

                     }];

文章来源: How to make UIView animation sequence repeat and autoreverse