1.思路：呼吸灯动画实现就是设置元件的透明度从无到有一直循环。
2.代码实现
#import "ViewController.h"
@interface ViewController ()
@property (weak, nonatomic) IBOutlet UIView *myView;
@end
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
_myView.layer.cornerRadius = 8;
//添加动画效果，aAlpha是给此次动画添加的标识，方便我们删除动画时，根据这个标识删除。
[_myView.layer addAnimation:[self alphaLight:0.5] forKey:@"aAlpha"];
}
#pragma mark - 呼吸灯动画
-(CABasicAnimation *)alphaLight:(float)time
{
CABasicAnimation *animation =[CABasicAnimation animationWithKeyPath:@"opacity"];
animation.fromValue = [NSNumber numberWithFloat:1.0f];
animation.toValue = [NSNumber numberWithFloat:0.3f];//这是透明度。
animation.autoreverses = YES;
animation.duration = time;
animation.repeatCount = MAXFLOAT;
animation.removedOnCompletion = NO;
animation.fillMode = kCAFillModeForwards;
animation.timingFunction=[CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseIn];
return animation;
}
3.移除动画
[_myView.layer removeAnimationForKey:@"aAlpha"];