原型从网上找的，动效使用了CAAnimation和UIDynamic物理引擎。 gitHub :https://github.com/BearRan/FlowMenuAnimation
大致步骤如下：
代码绘制凹槽动画
2.滚珠动画该分解成几个步骤
3.如何分解滚珠的物理效果
UIDynamic有以下物理效果
UIGravityBehavior：重力行为
| | #pragma mark 重力行为
- (UIGravityBehavior *)addGravityBehavior:(id <UIDynamicItem>)item
{
UIGravityBehavior *gravityBehavior = [[UIGravityBehavior alloc] init];
[gravityBehavior addItem:item];
[_animator addBehavior:gravityBehavior];
return gravityBehavior;
}
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UICollisionBehavior：碰撞行为
适用于：UIView和父类view的边界碰撞，以及和其他UIView碰撞
这里可以配合重力行为来设定小球的运动路径
#pragma mark 碰撞行为
- (UICollisionBehavior *)addCollisionBehavior:(id <UIDynamicItem>)item
{
UICollisionBehavior *collisionBehavior = [[UICollisionBehavior alloc] init];
[collisionBehavior addItem:item];
[collisionBehavior addBoundaryWithIdentifier:@"path" forPath:_beizerPath];
[_animator addBehavior:collisionBehavior];
return collisionBehavior;
}
顾名思义，不解释
UIPushBehavior：推动行为
使用瞬间或持续的力并按照某一方向作用于某个UIView
用于开始或结束时的小球推动
| | #pragma mark 显现动画，第一个球向右的推力
- (UIPushBehavior *)addPushBehavior_inFirstBtn
{
UIButton *tempBtn = _btnArray[0];
UIPushBehavior *pushBehavior = [[UIPushBehavior alloc] initWithItems:@[tempBtn] mode:UIPushBehaviorModeInstantaneous];
pushBehavior.pushDirection = CGVectorMake(1, 0.3);
pushBehavior.magnitude = 1.6;
[_animator addBehavior:pushBehavior];
return pushBehavior;
}
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UIAttachmentBehavior：附着行为
UIView和某个UIView的相互吸附行为
此处用于小球见的相互吸附作用
| | #pragma mark 添加球与球之间的附着行为
- (UIAttachmentBehavior *)addAttachmentBehavior_item:(id <UIDynamicItem>)item attachToItem:(id <UIDynamicItem>)attachToItem
{
SpecialBtn *tempBtn = (SpecialBtn *)item;
UIAttachmentBehavior *attachmentBehavior = [[UIAttachmentBehavior alloc] initWithItem:item attachedToItem:attachToItem];
[attachmentBehavior setLength:tempBtn.width + 20];
[attachmentBehavior setDamping:10.01];
[attachmentBehavior setFrequency:1];
[_animator addBehavior:attachmentBehavior];
return attachmentBehavior;
}
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UIDynamicItemBehavior：动力元素行为
一些其他的物理元素，比如摩擦力，线速度阻力，角速度阻力等
| | #pragma mark 动力元素行为
- (UIDynamicItemBehavior *)addDynamicItemBehavior:(id <UIDynamicItem>)item
{
UIDynamicItemBehavior *itemBehavior = [[UIDynamicItemBehavior alloc] initWithItems:@[item]];
itemBehavior.resistance = 0;
itemBehavior.allowsRotation = YES;
itemBehavior.angularResistance = 4.0;
itemBehavior.friction = 0.8;
[_animator addBehavior:itemBehavior];
return itemBehavior;
}
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阶段一：滚珠一起滚落下来时到最高点的阶段球与球之间的附着行为 + 重力行为＋碰撞行为+ 动力元素行为+ 第一个球向右的推力#pragma mark 显现动画
| | #pragma mark 显现动画
- (void)showBtnsAnimation
{
_animatorStatus = kAnimatorStatus_open;
[_animator removeAllBehaviors];
if (showPath) {
_pathLayer.path = _beizerPath.CGPath;
_pathLayer.fillColor = [UIColor clearColor].CGColor;
_pathLayer.strokeColor = [UIColor orangeColor].CGColor;
_pathLayer.lineWidth = 2.0;
[self.layer addSublayer:_pathLayer];
}
CGFloat btn_gap = [self setXX:16];
for (int i = 0; i < [_btnArray count]; i++) {
SpecialBtn *tempBtn = _btnArray[i];
tempBtn.tag = i;
[self addSubview:tempBtn];
// 设定初始位置
[tempBtn setX:(tempBtn.width + btn_gap) * ([_btnArray count] - 1 - i) + btn_gap];
[tempBtn setY:-tempBtn.height];
// 添加球与球之间的附着行为
if (i > 0) {
[self addAttachmentBehavior_item:_btnArray[i] attachToItem:_btnArray[i - 1]];
}
// 重力行为
UIGravityBehavior *gravityBehavior = [self addGravityBehavior:tempBtn];
if (i == [_btnArray count] - 1) {
// 最后一个球处理重力行为
[self dealLastBtnGravityBehavior:gravityBehavior tempBtn:tempBtn];
}
// 碰撞行为
[self addCollisionBehavior:tempBtn];
// 动力元素行为
UIDynamicItemBehavior *itemBehavior = [self addDynamicItemBehavior:tempBtn];
if (i == [_btnArray count] - 1) {
// 最后一个球增加密度,以防止出现的时候，由于惯性的原因导致飞起来
itemBehavior.density = 1.8;
}
}
// 第一个球向右的推力
[self addPushBehavior_inFirstBtn];
}
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阶段二：滚珠滚落到最高点后回流的的阶段球与球之间的附着行为 + 重力行为＋碰撞行为+ 动力元素行为+ 最后一个球向左pushf
| | for (int i = 0; i < [_btnArray count]; i++) {
// 添加球与球之间的附着行为
if (i > 0) {
UIAttachmentBehavior *attachmentBehavior = [self addAttachmentBehavior_item:_btnArray[i] attachToItem:_btnArray[i - 1]];
[attachmentBehavior setFrequency:5];
[attachmentBehavior setLength:tempBtn.width + 5];
}
// 重力行为
[self addGravityBehavior:_btnArray[i]];
// 碰撞行为
[self addCollisionBehavior:_btnArray[i]];
// 动力元素行为
UIDynamicItemBehavior *itemBehavior = [self addDynamicItemBehavior:_btnArray[i]];
itemBehavior.angularResistance = 15.0;
}
// 最后一个球向左push
UIPushBehavior *pushBehavior = [[UIPushBehavior alloc] initWithItems:@[tempBtn] mode:UIPushBehaviorModeContinuous];
pushBehavior.pushDirection = CGVectorMake(-1, -0.5);
pushBehavior.magnitude = 2.3;
[_animator addBehavior:pushBehavior];
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| | |
阶段三：滚珠消失阶段球与球之间的附着行为 + 重力行为＋碰撞行为+ 动力元素行为+ 最后一个球向左push（和阶段二几本一致，只是推动的力大了一些）
| | #pragma mark 消退动画
- (void)closeBtnsAniamtion
{
NSLog(@"-- closeBtnsAniamtion");
_animatorStatus = kAnimatorStatus_close;
SpecialBtn *lastBtn = (SpecialBtn *)[_btnArray lastObject];
[_animator removeAllBehaviors];
for (int i = 0; i < [_btnArray count]; i++) {
// 添加球与球之间的附着行为
if (i > 0) {
UIAttachmentBehavior *attachmentBehavior = [self addAttachmentBehavior_item:_btnArray[i] attachToItem:_btnArray[i - 1]];
[attachmentBehavior setFrequency:5];
[attachmentBehavior setLength:lastBtn.width + 5];
}
// 重力行为
UIGravityBehavior *gravityBehavior = [self addGravityBehavior:_btnArray[i]];
if (i == 0) {
[self dealFirstDisappearBtnGravityBehavior:gravityBehavior tempBtn:_btnArray[i]];
}
// 碰撞行为
[self addCollisionBehavior:_btnArray[i]];
// 动力元素行为
[self addDynamicItemBehavior:_btnArray[i]];
}
// 最后一个球向左push
UIPushBehavior *pushBehavior = [[UIPushBehavior alloc] initWithItems:@[lastBtn] mode:UIPushBehaviorModeContinuous];
pushBehavior.pushDirection = CGVectorMake(-1, -0.5);
pushBehavior.magnitude = 10.0;
[_animator addBehavior:pushBehavior];
}
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demo地址:
作者:熊熊xr
原文地址:http://code4app.com/forum.php?mod=viewthread&tid=9264&extra=page%3D62%26filter%3Dsortid%26orderby%3Ddateline%26sortid%3D1