方向更改时的UIScrollview内容大小

Question

我有一个分页的滚动视图.在viewDidLoad中,我检查当前方向是否为横向,然后我设置其内容大小的高度440

 if (UIDeviceOrientationIsPortrait([[UIDevice currentDevice] orientation])) 
    {
        [scroll      setContentSize:CGSizeMake(self.scroll.frame.size.width*numberOfPages,340)];


    }
    else if (UIDeviceOrientationIsLandscape([[UIDevice currentDevice] orientation]))

    {
        [scroll setFrame:CGRectMake(0,0,480,480)];
        [scroll setContentSize:CGSizeMake(self.scroll.frame.size.width*numberOfPages, 440)];


    }

一切正常滚动视图滚动顺畅,没有对角线滚动.

但是当方向改变时

我必须再次设置scrollview的框架和内容,我将其设置如下

-(void)orientationChanged:(id)object
{
if(UIDeviceOrientationIsPortrait([[UIDevice currentDevice] orientation]))
{
    self.scroll.frame = [[UIScreen mainScreen]bounds];

    [scroll setContentSize:CGSizeMake(self.scroll.frame.size.width*numberOfPages, 340)];
}


else
{
 self.scroll.frame = CGRectMake(0,0,480,480);
        [scroll setContentSize:CGSizeMake(self.scroll.frame.size.width*numberOfPages, 600)];
}


}

我不明白为什么我必须在横向模式下将内容大小的高度设置为600,这太不够了.并且它增加了另一个问题,即scrollview开始对角线滚动,我不想要,因为它看起来很奇怪.任何人都可以帮我理解我错过的地方和地点吗？

我已将scrollview的自动调整遮罩设置为

[scroll setAutoresizingMask:UIViewAutoresizingFlexibleLeftMargin|UIViewAutoresizingFlexibleRightMargin|UIViewAutoresizingFlexibleHeight];

但改变它没有帮助.

Answer 1

1. 不要用UIDeviceOrientation.请UIInterfaceOrientation改用.DeviceOrientation这里有两个你不需要的额外选项.(UIDeviceOrientationFaceUp和UIDeviceOrientationFaceDown)

2. Yes从... 返回shouldAutorotateToInterfaceOrientation

3. 现在willRotateToInterfaceOrientation: duration:每次旋转设备时都会调用.

4. 像这样实现这个方法.

   -(void)willRotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation duration:(NSTimeInterval)duration
   {
   CGRect frame;
   int pageNumber = 2;
   int statusBarHeight = 20;
   
   if ((toInterfaceOrientation == UIInterfaceOrientationLandscapeLeft) || (toInterfaceOrientation == UIInterfaceOrientationLandscapeRight)) {
       frame = CGRectMake(0, 0, 480, 320 - statusBarHeight);
   } else {
       frame = CGRectMake(0, 0, 320, 480 - statusBarHeight);
   }
   
   scrollView.frame = frame;
   scrollView.contentSize = CGSizeMake(frame.size.width * 2, frame.size.height);
   } 
   

   让,

   pageNumber = 2

   statusBarHeight = 20