我相信你想让条形图的高度动画化。我建议您将每个栏实现为一个单独的UIview，一个简单的矩形。您也可以使用自定义绘图将它们全部放置在一个视图中。然后，您需要缩放这些视图或在动画块内更改其帧，方法如下：

+ (void)animateWithDuration:(NSTimeInterval)duration animations:(void (^)(void))animations completion:(void (^)(BOOL finished))completion

或

+ (void)animateWithDuration:(NSTimeInterval)duration animations:(void (^)(void))animations

一个伟大的教程见this。
这是一个例子，如果你没有很多时间。

[UIView animateWithDuration:1//Amount of time the animation takes.
                      delay:0//Amount of time after which animation starts.
                    options: UIViewAnimationCurveEaseOut//How the animation will behave.
                 animations:^{
                    //here you can either set a CGAffineTransform, or change your view's frame.
                    //Both will work just fine.
                    yourBarView.transform = CGAffineTransformMakeScale (
                    scaleForX,//say 1, you dont want it to change.
                    scaleForY//say 20, you want to make it 20 times larger in the y                                               
                    //direction.
                    //Note* to animate from a zero height to a finite height change the                  
                    //view's frame.
                    //yourBarView.frame = CGRectMake(0,0,20,100);
                    );
                 }
                 completion:^(BOOL finished){//This block is called when the animation completes.
                     NSLog(@"Done!");
                 }];