我已经使用 Pan Gesture 创建了 Pullable View ,一切正常,但存在弹跳问题。当我们向上滑动 View 时,在动画结束时出现弹跳,就像通知中心在 View 动画结束时弹跳一样。我已经为 Bounces 创建了一个 bounces Category,但我没有得到与 Notification Center 相同的 bounces。必须对弹跳进行一些调整。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
最佳答案
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 ,基本上这是一种制作弹跳动画的简单方法。
我们的做法是在 iOS7+ 上使用反弹,在 iOS6 上我们使用另一种动画。
关于ios - 像通知中心弹跳一样的可拉式 View ,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/24904620/