iOS开发 动画显示view切换效果 

下面的代码段来自《Beginning iOS 5 Development》第六章,是一个多view应用的例子,本想贴整个例子,但是代码实在太多。


-(IBAction)switchViews:(id)sender
{
    [UIView beginAnimations:@"View Flip" context:nil];
    //开始动画,View Flip是动画类型,对文档不是很熟,找不到所有支持的类型
    [UIView setAnimationDuration:1.5];
    //动画时间
    [UIView setAnimationCurve:UIViewAnimationCurveEaseInOut];
    //开始和结束的时候速度慢,中间速度快
    
    if(self.yellowViewController.view.superview==nil)
    {//当yellowViewController存在,且它的view被显示时,它的superview才不会等于nil
        //即,这里的代码在yellowViewController.view显示时不会执行,在blueViewController.view显示时才执行
        if(self.yellowViewController==nil)
        {//如果yellowViewController未初始化,则调用YelowView.xib文件初始化,参数中无xib扩展名
            self.yellowViewController=[[BIDYellowViewController alloc] initWithNibName:@"YellowView" bundle:nil];
        }
        [UIView setAnimationTransition:UIViewAnimationTransitionFlipFromRight forView:self.view cache:YES];
        //从右往左翻,启用缓存
        
        
        [blueViewController.view removeFromSuperview];
        [self.view insertSubview:self.yellowViewController.view atIndex:0];
        //移除blueViewController.view,并把yellowViewController.view加入self.view
        
    }else 
    {
        if(self.blueViewController==nil)
        {//在内存资源不足时,blueViewController资源可能会被系统回收,所以也需要判断
            self.blueViewController=[[BIDBlueViewController alloc] initWithNibName:@"BlueView" bundle:nil];
        }
        [UIView setAnimationTransition:UIViewAnimationTransitionCurlUp
                               forView:self.view cache:YES];
        //从下往上翻
        
        [yellowViewController.view removeFromSuperview];
        [self.view insertSubview:self.blueViewController.view atIndex:0];
        
    }
    [UIView commitAnimations];
    //标记动画结束
}

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