Question

我已经使用Pan Gesture创建了Pullable视图，但每个工作正常，但跳出有问题。当我们向上滑动视图时，在动画结束时反弹，就像通知中心在视图动画结束时反弹一样。我已经为跳出创建了跳出类别但是我没有像通知中心那样获得相同的反弹。必须在弹跳上进行一些调整。所以请帮助我。以下是我的代码。

#import "UIView+Bounce.h"
@implementation UIView (Bounce)
+ (CAKeyframeAnimation *)dockBounceAnimationWithViewHeight:(CGFloat)viewHeight {
    NSUInteger const kNumFactors    = 23;
    CGFloat const kFactorsPerSec    = 120.0f;
    CGFloat const kFactorsMaxValue  = 128.0f;

    CGFloat factors[kNumFactors]    = { 0,  83, 100, 114, 124, 138, 156, 184, 156, 138, 124, 114, 100, 83, 32, 0, 0, 18, 28, 32, 28, 18, 0 };

    NSMutableArray *transforms = [NSMutableArray array];

    for (NSUInteger i = 0; i < kNumFactors; i++) {
        CGFloat positionOffset  = factors[i] / kFactorsMaxValue * viewHeight;
        CATransform3D transform = CATransform3DMakeTranslation(0.0f, -positionOffset, 0.0f);

        [transforms addObject:[NSValue valueWithCATransform3D:transform]];
    }

    CAKeyframeAnimation *animation = [CAKeyframeAnimation animationWithKeyPath:@"transform"];
    animation.repeatCount           = 1;
    animation.duration              = kNumFactors * 1.0f / kFactorsPerSec;
    animation.fillMode              = kCAFillModeForwards;
    animation.values                = transforms;
    animation.removedOnCompletion   = YES; // final stage is equal to starting stage
    animation.autoreverses          = NO;

    return animation;
}
- (void)bounce:(float)bounceFactor {
    CGFloat midHeight = self.frame.size.height * bounceFactor;
    CAKeyframeAnimation *animation = [[self class] dockBounceAnimationWithViewHeight:midHeight];
    [self.layer addAnimation:animation forKey:@"bouncing"];
}
@end

Answer 1

您的目标是iOS7 +吗？在这种情况下，功能是内置的。您可以使用：

+ (void)animateWithDuration:(NSTimeInterval)duration 
                      delay:(NSTimeInterval)delay 
     usingSpringWithDamping:(CGFloat)dampingRatio 
      initialSpringVelocity:(CGFloat)velocity 
                    options:(UIViewAnimationOptions)options 
                 animations:(void (^)(void))animations 
                 completion:(void (^)(BOOL finished))completion

该方法的文档是here，基本上它是制作弹跳动画的简单方法。

我们这样做的方式是我们在iOS7 +上使用弹跳，在iOS6上我们使用另一种动画。

像通知中心一样的可拉动视图反弹

1 个答案: