UIImageView *bagImgView = [[UIImageView alloc]initWithFrame:CGRectMake(20, 20, 30, 30)];
bagImgView.backgroundColor=[UIColor yellowColor];
[self.view addSubview:bagImgView];
bagImgView.image=[UIImage imageNamed:@"1.jpg"];
CAKeyframeAnimation *keyAnima1111=[CAKeyframeAnimation animationWithKeyPath:@"position"];
keyAnima1111.duration = 1.0;
keyAnima1111.repeatCount=1000;
CGMutablePathRef path1 = CGPathCreateMutable();
//注：startPoint是起点，endPoint是终点
ctrlPoint是控制点 自行调整数值可以出现理想弧度效果
CGPoint startPoint=CGPointMake(100, 480);
CGPoint endPoint=CGPointMake(300, 560);
CGPoint ctrlPoint=CGPointMake(150, 200);
CGPathMoveToPoint(path1, NULL, startPoint.x, startPoint.y);
CGPathAddQuadCurveToPoint(path1, NULL, ctrlPoint.x, ctrlPoint.y, endPoint.x, endPoint.y);
keyAnima1111.path=path1;
CGPathRelease(path1);
CABasicAnimation *animation=[CABasicAnimation animationWithKeyPath:@"transform.scale"];
animation.duration=1.0;
animation.repeatCount=1000;
animation.fromValue=[NSNumber numberWithFloat:1.0];
animation.toValue=[NSNumber numberWithFloat:0.5];
CAAnimationGroup *groupAnimation=[CAAnimationGroup animation];
groupAnimation.duration=1.0;
groupAnimation.repeatCount=1000;
groupAnimation.animations=@[animation,keyAnima1111];
[bagImgView.layer addAnimation:groupAnimation forKey:@"groupAnimation"];
动画播放完以后想要进行其他的操作，可以延迟调用
dispatch_time_t popTime = dispatch_time(DISPATCH_TIME_NOW, (int64_t)(delayInSeconds * NSEC_PER_SEC));
dispatch_after(popTime, dispatch_get_main_queue(), ^(void){
}
或者
[self performSelector:@selector(delayMethod) withObject:nil afterDelay:3.0f];
