////  SecondClockView.h//  YouXianMingClock////  Created by YouXianMing on 14-10-12.//  Copyright (c) 2014年 YouXianMing. All rights reserved.//#import <UIKit/UIKit.h>@interface SecondClockView : UIView/** *  Use in conjunction with ‘springSpeed‘ to change animation effect. Values are converted into corresponding dynamics constants. Defined as a value in the range [0, 20]. Defaults to 18. */@property (nonatomic, assign) CGFloat springBounciness;/** *  The mass used in the dynamics simulation. */@property (nonatomic, assign) CGFloat dynamicsMass;/** *  Use in conjunction with ‘springBounciness‘ to change animation effect. Values are converted into corresponding dynamics constants. Defined as a value in the range [0, 20]. Defaults to 18. */@property (nonatomic, assign) CGFloat springSpeed;/** *  给与时间进行的动画 * *  @param second 当前秒 */- (void)startAnimationWithSecond:(float)second;@end

////  SecondClockView.m//  YouXianMingClock////  Created by YouXianMing on 14-10-12.//  Copyright (c) 2014年 YouXianMing. All rights reserved.//#import "SecondClockView.h"#import "POP.h"/** *  将角度转换为弧度 * *  @param d 角度 * *  @return 弧度 */#define DEGREES__TO__RADIANS(d)  ((d) * M_PI / 180.f)@interface SecondClockView (){        BOOL firstTime;    }@end@implementation SecondClockView- (void)startAnimationWithSecond:(float)second{    // 秒钟    POPSpringAnimation *springAnimation =         [POPSpringAnimation animationWithPropertyNamed:kPOPLayerRotation];        springAnimation.fromValue        = @(DEGREES__TO__RADIANS((360)/60.f)*(second - 1) + DEGREES__TO__RADIANS(-90));    if (firstTime == NO) {        firstTime = YES;        springAnimation.fromValue    = @(0);    }    springAnimation.toValue          = @(DEGREES__TO__RADIANS((360)/60.f)*second + DEGREES__TO__RADIANS(-90));    springAnimation.springBounciness = (_springBounciness > 0 && _springBounciness <= 20)?_springBounciness:18.f;    springAnimation.dynamicsMass     = (_dynamicsMass > 0)?_dynamicsMass:1.5f;    springAnimation.springSpeed      = (_springSpeed > 0 && _springSpeed <= 20)?_springSpeed:18.f;    [self.layer pop_addAnimation:springAnimation forKey:nil];}@end