ios - 在特定的转场之后如何触发我的动画？

Question

我有一个正在运行的动画。我遵循了这个答案 Xcode How to move an image up and down animation

我能够通过按钮触发动画。我真正想要的是在特定的 segue 之后触发动画。当我转至 Storyboard 中的特定 View 时是否可以触发此动画？

动画在我的 ViewController 实现中的一个方法中。

-(void)animatePicker
{

    NSLog(@"Animate");
    CGPoint startPoint = (CGPoint){100.f, 100.f};
    CGPoint middlePoint = (CGPoint){400.f, 400.f};
    CGPoint endPoint = (CGPoint){600.f, 100.f};

    CGMutablePathRef thePath = CGPathCreateMutable();
    CGPathMoveToPoint(thePath, NULL, startPoint.x, startPoint.y);
    CGPathAddLineToPoint(thePath, NULL, middlePoint.x, middlePoint.y);
    CGPathAddLineToPoint(thePath, NULL, endPoint.x, endPoint.y);

    CAKeyframeAnimation *animation = [CAKeyframeAnimation animationWithKeyPath:@"position"];
    animation.duration = 3.f;
    animation.path = thePath;
    [pickerCircle.layer addAnimation:animation forKey:@"position"];
    pickerCircle.layer.position = endPoint;
}

Answer 1

实现一个-(void)viewDidAppear；在你的 UIViewController 中调用你的动画函数。

当 UIViewController View 已创建并出现时调用此函数。

- (void)viewDidAppear:(BOOL)animated
{
    [super viewDidAppear:animated];
    NSLog(@"viewDidAppear");
    [masterViewController animate];
}