1 UIImage *image = [UIImage imageNamed:@"heart.png"];
2 CALayer *layer = [CALayer layer];
3 layer.contents = (id)image.CGImage;
4 layer.bounds = CGRectMake(0, 0, image.size.width, image.size.height);
5 layer.position = CGPointMake(160, 200);
6
7 layer.transform = CATransform3DMakeScale(0.90, 0.90, 1); // 将图片大小按照X轴和Y轴缩放90%，永久
8 [self.view.layer addSublayer:layer];
9
10 CABasicAnimation *animation = [CABasicAnimation animationWithKeyPath:@"transform"];
11 animation.toValue = [NSValue valueWithCATransform3D:CATransform3DIdentity]; // 将目标值设为原值
12 animation.autoreverses = YES; // 自动倒回最初效果
13 animation.duration = 0.35;
14 animation.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut];
15 animation.repeatCount = HUGE_VALF;
16 [layer addAnimation:animation forKey:@"pulseAnimation"];