POP(來自非死book)自定義動畫的一個擴展：MMTweenAnimation

Back	Bounce	Circ	Cubic	Elastic

Expo	Quad	Quart	Quint	Sine

To apply a MMTweenAnimation, you must configure it by:

@property (nonatomic, copy)   MMTweenAnimationBlock  animationBlock;

@property (nonatomic, assign) double fromValue;
@property (nonatomic, assign) double toValue;
@property (nonatomic, assign) double duration;  //default: 0.3

@property (nonatomic, assign) MMTweenFunctionType functionType; //default: MMTweenFunctionBounce
@property (nonatomic, assign) MMTweenEasingType   easingType;   //default: MMTweenEasingOut

for example:

MMTweenAnimation *anim = [MMTweenAnimation animation];
anim.functionType   = MMTweenFunctionBounce;
anim.easingType     = MMTweenEasingOut;
anim.duration       = 2.0f;
anim.fromValue      = 0;
anim.toValue        = 200;
anim.animationBlock = ^(double c,double d,double v,id target,MMTweenAnimation *animation)
{
    //c: current time, from the beginning of animation
    //d: duration, always bigger than c
    //v: value, after the change at current time

    UIView *t = (UIView*)target;
    t.center = CGPointMake(t.x, v);
};

[targetView pop_addAnimation:anim forKey:@"center.y"];

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