IOS第18天(6,CAKeyframeAnimation关键帧动画）

*******

#import "HMViewController.h"

@interface HMViewController ()
@property (weak, nonatomic) IBOutlet UIView *redView;

@end

@implementation HMViewController

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
}

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
    CAKeyframeAnimation *anim = [CAKeyframeAnimation animation];

    // 设置动画属性
    anim.keyPath = @"position";

    UIBezierPath *path = [UIBezierPath bezierPathWithOvalInRect:CGRectMake(0, 0, 200, 200)];

    anim.path = path.CGPath;

    anim.duration = 0.25;

    // 取消反弹
    anim.removedOnCompletion = NO;

    anim.fillMode = kCAFillModeForwards;

    anim.repeatCount = MAXFLOAT;

    [_redView.layer addAnimation:anim forKey:nil];

}
- (void)value
{
    CAKeyframeAnimation *anim = [CAKeyframeAnimation animation];

    // 设置动画属性
    anim.keyPath = @"position";

    NSValue *v1 = [NSValue valueWithCGPoint:CGPointZero];

    NSValue *v2 = [NSValue valueWithCGPoint:CGPointMake(160, 160)];

    NSValue *v3 = [NSValue valueWithCGPoint:CGPointMake(270, 0)];

    anim.values = @[v1,v2,v3];

    anim.duration = 2;

    [_redView.layer addAnimation:anim forKey:nil];
}

@end