ios开发之核心动画四：核心动画-Core Animation--CABasicAnimation基础核心动画

#import "ViewController.h"

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

@end

@implementation ViewController

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

}

-(void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event {

    //1.创建动画对象(设置layer的属性值.)
    CABasicAnimation *anim = [CABasicAnimation animation];
    //2.设置属性值
    anim.keyPath = @"position.x";
    anim.toValue = @300;

    //动画完成时, 会自动删除动画
    anim.removedOnCompletion = NO;
    anim.fillMode = @"forwards";

    //3.添加动画：key值是为了区分不同的动画
    [self.redView.layer addAnimation:anim forKey:nil];

}

核心动画之作用在层上面.

动画的本质是改图层的某一个属性.

CABasicAnimation *anim = [CABasicAnimation animation];

图层有那些属性,这里才能写那些属性.

anim.keyPath = @"transform.scale";

anim.toValue = @0.5;

告诉动画完成的时候不要移除

anim.removedOnCompletion = NO;

保存动画最前面的效果.也就是最后一个设置的效果

anim.fillMode = kCAFillModeForwards;

把动画添加到层上面.

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

二：心跳效果

#import "ViewController.h"

@interface ViewController ()
@property (weak, nonatomic) IBOutlet UIImageView *imageV;

@end

@implementation ViewController

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

-(void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event {

    //创建动画对象
    CABasicAnimation *anim = [CABasicAnimation animation];

    //设置属性值
    anim.keyPath = @"transform.scale";
    anim.toValue = @0;

    //设置动画执行次数
    anim.repeatCount = MAXFLOAT;

    //设置动画执行时长
    anim.duration = 3;

    //自动反转(怎么样去 怎么样回来)
    anim.autoreverses = YES;

    //添加动画
    [self.imageV.layer addAnimation:anim forKey:nil];

}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

@end

思路:就是让一张图片做一个放大缩放小的动画.

代码实现:

CABasicAnimation *anim =[CABasicAnimation  animation];

设置缩放属性

anim.keyPath = @"transform.scale";

缩放到最小

anim.toValue = @0;

设置动画执行的次数

anim.repeatCount = MAXFLOAT;

设置动画执行的时长

anim.duration = 0.25;

设置动画自动反转(怎么去, 怎么回)

anim.autoreverses = YES;

添加动画

[self.heartView.layer addAnimation:anim forKey:nil];