ios - 如何让UIView动画更流畅？

Question

我有几个手势识别器来左右滑动图像或 vv，具体取决于滑动方向。但我希望动画更流畅。这是我到目前为止的代码:

-(void)swipeNext:(id)sender{
    //0 Get the currentview as referenced by pageControl
    UIImageView *oldView = [views objectAtIndex:currentViewIndex];
    //MOVE ON TO NEW VIEW
    currentViewIndex ++;
    NSLog(@"left swiped  - currentViewIndex:%d", currentViewIndex);
    UIImageView *newView = [views objectAtIndex:currentViewIndex];
    //NSLog(@"views objectAtIndex = %@",[views objectAtIndex:[self.pageControl currentPage]]);

    //1 Animate out the old view
    newView.frame = oldView.frame;
    newView.center = CGPointMake(oldView.center.x + CGRectGetWidth(oldView.frame), oldView.center.y);
    [oldView.superview addSubview: newView];

    [UIView animateWithDuration:1.0
                          delay: 0.0
                        options: UIViewAnimationOptionCurveEaseIn //UIViewAnimationOptionRepeat | UIViewAnimationOptionAutoreverse
                     animations:^{
                         newView.center = oldView.center;
                         oldView.center = CGPointMake(oldView.center.x - CGRectGetWidth(oldView.frame), oldView.center.y);

                     }
                     completion:nil];
}

我想让它更快一点。我已经发布了我试图模拟的应用程序 DunkinDonuts ( What kind of viewcontrollers does the Dunkin Donuts app use ) 的引用，它们似乎使用了 UIPageControl，我一开始尝试使用它，但无法确定滑动的方向 ( How do I animate a UIImageView left to right with UIPageControl? )，所以我切换到手势。但如果您看到他们的应用程序，滑动速度会更快。

Answer 1

我发现要添加格式正确(可读)的代码块，我无法使用注释。有人建议我使用答案作为我原来问题的更新。所以就在这里。

更新

我这样修改了我的代码。与往常一样，viewDidLoad 调用 createUIViews 来执行以下操作:

-(void)createUIViews{
    UIImage *image1 = [UIImage imageNamed:@"GiftCard.png"];
    firstView = [[UIImageView alloc] initWithImage:image1];

    CGRect newFrame1 = firstView.frame;
    newFrame1.origin.x = 50;
    newFrame1.origin.y = 10;
    firstView.frame = newFrame1;

    UIImage *image2 = [UIImage imageNamed:@"MyCard.png"];
    secondView = [[UIImageView alloc] initWithImage:image2];

    CGRect newFrame2 = secondView.frame;
    newFrame2.origin.x = 350;//CGRectGetWidth(firstView.superview.frame)/2;
    newFrame2.origin.y = 10;
    secondView.frame = newFrame2;

    //Add all Views offscreen except #1
    [self.scrollView addSubview:firstView]; //added ONSCREEN
    [self.scrollView addSubview:secondView]; //added OFFSCREEN
}

这会将第一个 View 设置在屏幕上，将第二个 View 设置在右侧。

手势识别器也在viewDidLoad中设置。他们调用 swipeNext 如下:

-(void)swipeNext:(id)sender{
//0 Get the currentview as referenced by pageControl
oldView = [views objectAtIndex:currentViewIndex];
//MOVE ON TO NEW VIEW
currentViewIndex ++;
newView = [views objectAtIndex:currentViewIndex];

//1 Animate out the old view **(Aaron, youre right, dont need this anymore)**
//newView.frame = oldView.frame;
//newView.center = CGPointMake(oldView.center.x + CGRectGetWidth(oldView.frame), oldView.center.y);
//[oldView.superview addSubview: newView];

[UIView animateWithDuration:1.0
                      delay: 0.0
                    options: UIViewAnimationOptionCurveEaseIn 
                 animations:^{
                     newView.center = oldView.center;
                     oldView.center = CGPointMake(oldView.center.x - CGRectGetWidth(oldView.frame), oldView.center.y);

                 }
                 completion:nil];

}我注释掉了 addSubview，因为我将其移至 createUIViews 方法。它的工作原理是一样的，我认为这只是速度问题或我缺少的一些动画功能。我希望我可以添加视频。最初的 DD 应用程序看起来比 UIPageControl 更快地制作动画(我认为)这是视频的链接。 Sluggish iOS UIView Animation