//一定时间内完成动作后执行某个动作
+(void)animateWithDuration:(NSTimeInterval)duration animations:(void (^)(void))animations completion:(void (^__nullable)(BOOL finished))completion;
//一定时间内完成动作
+(void)animateWithDuration:(NSTimeInterval)duration animations:(void (^)(void))animations;
/*
duration : 动画时间
delay : 延迟时间
dampingRatio : 阻尼系数(弹性) 越小越弹
velocity : 速率
options : 选项
animations : 做动画的代码块
completion : 动画完成的代码块 "回调"
*/
+(void)animateWithDuration:(NSTimeInterval)duration delay:(NSTimeInterval)delay usingSpringWithDamping:(CGFloat)dampingRatioinitialSpringVelocity:(CGFloat)velocity options:(UIViewAnimationOptions)options animations:(void (^)(void))animations completion:(void (^__nullable)(BOOL finished))completion;