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"];