core Animation之CAKeyframeAnimation(关键帧动画)

CABasicAnimation的区别是：CABasicAnimation只能从一个数值(fromValue)变到另一个数值(toValue)，而CAKeyframeAnimation会使用一个NSArray保存这些数值

属性解析：

values：就是上述的NSArray对象。里面的元素称为”关键帧”(keyframe)。动画对象会在指定的时间(duration)内，依次显示values数组中的每一个关键帧

path：可以设置一个CGPathRef\CGMutablePathRef,让层跟着路径移动。path只对CALayer的anchorPoint和position起作用。如果你设置了path，那么values将被忽略

keyTimes：可以为对应的关键帧指定对应的时间点,其取值范围为0到1.0,keyTimes中的每一个时间值都对应values中的每一帧.当keyTimes没有设置的时候,各个关键帧的时间是平分的

说明：CABasicAnimation可看做是最多只有2个关键帧的CAKeyframeAnimation

#import "ViewController.h"



@interface ViewController ()

@property(nonatomic,strong)UIButton *btn;

@end



@implementation ViewController



- (void)viewDidLoad {

    [super viewDidLoad];

    self.btn=[UIButton buttonWithType:UIButtonTypeSystem];

    self.btn.frame=CGRectMake(100, 100, 50, 40);

    [self.btn setTitle:@"按钮" forState:UIControlStateNormal];

    [self.btn addTarget:self action:@selector(btnClick:) forControlEvents:UIControlEventTouchUpInside];

    [self.view addSubview:self.btn];

}



-(void)btnClick:(id)sender

{

    //关键帧动画有两种实现方式 一种是通过设置values的值来改变 另一种是通过设置path属性值来改变

    

    //values属性

    CAKeyframeAnimation *keyframeAnimation=[CAKeyframeAnimation animation];

    keyframeAnimation.keyPath=@"position";

    NSValue *value1=[NSValue valueWithCGPoint:CGPointMake(100, 100)];

    NSValue *value2=[NSValue valueWithCGPoint:CGPointMake(200, 100)];

    NSValue *value3=[NSValue valueWithCGPoint:CGPointMake(200, 200)];

    NSValue *value4=[NSValue valueWithCGPoint:CGPointMake(100, 200)];

    NSValue *value5=[NSValue valueWithCGPoint:CGPointMake(100, 100)];

    keyframeAnimation.values=@[value1,value2,value3,value4,value5];

    //values和keyTimes的个数是一样的 值在0-1之间 逐渐增加直到为1

    keyframeAnimation.keyTimes=@[[NSNumber numberWithFloat:0.1],[NSNumber numberWithFloat:0.3],[NSNumber numberWithFloat:0.5],[NSNumber numberWithFloat:0.75],[NSNumber numberWithFloat:1]];

    keyframeAnimation.removedOnCompletion=NO;

    keyframeAnimation.fillMode=kCAFillModeForwards;

    keyframeAnimation.duration=4.0;

    keyframeAnimation.timingFunction=[CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseOut];

    keyframeAnimation.delegate=self;

    //设置动画的key 这样可以移除动画 [self.btn.layer removeAnimationForKey:<#(NSString *)#>]

    [self.btn.layer addAnimation:keyframeAnimation forKey:@"cuiyw"];

    

    

    //path属性

//    CAKeyframeAnimation *keyframeAnimation=[CAKeyframeAnimation animation];

//    keyframeAnimation.keyPath=@"position";

//    CGMutablePathRef path=CGPathCreateMutable();

//    CGPathAddEllipseInRect(path, NULL, CGRectMake(100, 100, 200, 200));

//    keyframeAnimation.path=path;

//    keyframeAnimation.duration=5.0;

//    //ease 缓解

////    kCAMediaTimingFunctionLinear 线性（匀速）|

////    kCAMediaTimingFunctionEaseIn 先慢|

////    kCAMediaTimingFunctionEaseOut 后慢|

////    kCAMediaTimingFunctionEaseInEaseOut 先慢 后慢 中间快|

////    kCAMediaTimingFunctionDefault 默认

//    keyframeAnimation.timingFunction=[CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseIn];

//    keyframeAnimation.removedOnCompletion=NO;

//    keyframeAnimation.fillMode=kCAFillModeForwards;

//    

//    [self.btn.layer addAnimation:keyframeAnimation forKey:nil];

//    

    

}

- (void)animationDidStart:(CAAnimation *)anim

{

    NSLog(@"开始动画");

}

- (void)animationDidStop:(CAAnimation *)anim finished:(BOOL)flag

{

    NSLog(@"结束动画");



}



- (void)didReceiveMemoryWarning {

    [super didReceiveMemoryWarning];

    // Dispose of any resources that can be recreated.

}



@end