用Easing函数实现碰撞效果

用Easing函数实现碰撞效果

工程中需要的源码请从这里下载：

https://github.com/YouXianMing/EasingAnimation

源码：

//

//  ViewController.m

//  EasingView

//

//  Created by YouXianMing on 15/1/17.

//  Copyright (c) 2015年 YouXianMing. All rights reserved.

//

#import "ViewController.h"

#import "YXEasing.h"

@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad {

    [super viewDidLoad];

    // 显示的view

    UIView *showView            = [[UIView alloc] initWithFrame:CGRectMake(, -, , )];

    showView.backgroundColor    = [UIColor clearColor];

    showView.layer.borderColor  = [UIColor redColor].CGColor;

    showView.layer.borderWidth  = .f;

    showView.layer.cornerRadius = .f;

    [self.view addSubview:showView];

    // 关键帧动画

    CAKeyframeAnimation *animation = [CAKeyframeAnimation animationWithKeyPath:@"position"];

    // 设置值

    [animation setValues:[YXEasing calculateFrameFromPoint:showView.center

                                                   toPoint:CGPointMake(showView.center.x, showView.center.y + )

                                                      func:BounceEaseOut

                                                frameCount:]];

    // 设置持续时间

    animation.duration  = .f;

    // 执行动画效果

    showView.center = CGPointMake(showView.center.x, showView.center.y + );

    [showView.layer addAnimation:animation forKey:nil];

}

@end