转换为横向，然后回到肖像后，iOS界限会发生变化

Question

当我的应用程序启动时，我视图边界的NSLog显示以下内容：

NSLog(@"My view frame: %@", NSStringFromCGRect(self.view.bounds));
My view frame: {{0, 0}, {320, 548}}

然后我旋转模拟器并获得以下内容：

NSLog(@"My view frame: %@", NSStringFromCGRect(self.view.bounds));
My view frame: {{0, 0}, {320, 548}}

然后当我将模拟器旋转回来时，我得到了这个：

NSLog(@"My view frame: %@", NSStringFromCGRect(self.view.bounds));
My view frame: {{0, 0}, {568, 300}}

我用来调整元素的两种方法是这些，它们尚未完成，因为我目前正在为新的iPhone修复它们。

-(void) resizeForLandscape
{
    newsLabel = (UILabel *)[self.view viewWithTag:50];
    weatherLabel = (UILabel *)[self.view viewWithTag:51];
    sportsLabel = (UILabel *)[self.view viewWithTag:52];
    entertainmentLabel = (UILabel *)[self.view viewWithTag:53];
    videosLabel = (UILabel *)[self.view viewWithTag:54];
    moreLabel = (UILabel *)[self.view viewWithTag:55];

    NSLog(@"resizeForLandscape called");
    webView.frame = CGRectMake(0, 31, self.view.frame.size.width, self.view.frame.size.height - 75);    
    button.frame = CGRectMake(0, 0, image.size.width -30, image.size.height -15);
    myLabel.frame = CGRectMake(230, 100, 80, 21);
    label.frame = CGRectMake(0, 0, self.view.bounds.size.height + 15, 30);

    NSLog(@"My view frame: %@", NSStringFromCGRect(self.view.bounds));
    NSLog(@"my status bar height is %f", [UIApplication sharedApplication].statusBarFrame.size.height);
    NSLog(@"my status bar width is %f", [UIApplication sharedApplication].statusBarFrame.size.width);


    newsLabel.frame = CGRectMake((self.view.bounds.size.height - 346) / 2 + 12, self.view.bounds.size.width - 38, 43, 21);
    weatherLabel.frame = CGRectMake(newsLabel.frame.origin.x + 64, self.view.bounds.size.width - 38, 42, 21);
    sportsLabel.frame = CGRectMake(newsLabel.frame.origin.x + 126, self.view.bounds.size.width - 38, 42, 21);
    entertainmentLabel.frame = CGRectMake(newsLabel.frame.origin.x + 185, self.view.bounds.size.width - 38, 66, 21);
    videosLabel.frame = CGRectMake(newsLabel.frame.origin.x + 269, self.view.bounds.size.width - 38, 42, 21);
    moreLabel.frame = CGRectMake(newsLabel.frame.origin.x + 325, self.view.bounds.size.width - 38, 42, 21);

    spacer1.width = (self.view.bounds.size.height - 346) / 2;
    spacer2.width = 40;
    spacer3.width = 28;
    spacer4.width = 42;
    spacer5.width = 35;
    spacer6.width = 24;
}

-(void) resizeForPortrait
{
    newsLabel = (UILabel *)[self.view viewWithTag:50];
    weatherLabel = (UILabel *)[self.view viewWithTag:51];
    sportsLabel = (UILabel *)[self.view viewWithTag:52];
    entertainmentLabel = (UILabel *)[self.view viewWithTag:53];
    videosLabel = (UILabel *)[self.view viewWithTag:54];
    moreLabel = (UILabel *)[self.view viewWithTag:55];

    NSLog(@"resizeForPortrait called");

    webView.frame = CGRectMake(0, 44, self.view.frame.size.width, self.view.frame.size.height -88);
    button.frame = CGRectMake(0, 0, image.size.width, image.size.height);
    myLabel.frame = CGRectMake(145, 152, 80, 21);
    label.frame = CGRectMake(0, 0, 315, 40);

    NSLog(@"My view frame: %@", NSStringFromCGRect(self.view.bounds));

    NSLog(@"my status bar height is %f", [UIApplication sharedApplication].statusBarFrame.size.height);
    NSLog(@"my status bar width is %f", [UIApplication sharedApplication].statusBarFrame.size.width);


    float myWidth = MIN(self.view.bounds.size.height, self.view.bounds.size.width);
    float myHeight = MAX(self.view.bounds.size.height, self.view.bounds.size.width);

    newsLabel.frame = CGRectMake(newsLabel.frame.origin.x, myHeight - 18, 43, 21);
    weatherLabel.frame = CGRectMake(newsLabel.frame.origin.x + 43, myHeight - 18, 42, 21);
    sportsLabel.frame = CGRectMake(newsLabel.frame.origin.x + 97, myHeight - 18, 42, 21);
    entertainmentLabel.frame = CGRectMake(newsLabel.frame.origin.x + 138, myHeight - 18, 66, 21);
    videosLabel.frame = CGRectMake(newsLabel.frame.origin.x + 213, myHeight - 18, 42, 21);
    moreLabel.frame = CGRectMake(newsLabel.frame.origin.x + 258, myHeight - 18, 42, 21);


    spacer1.width = (myWidth - 346) / 2;
    spacer2.width = 20;
    spacer3.width = 18;
    spacer4.width = 25;
    spacer5.width = 28;
    spacer6.width = 14;
}

被叫：

-(void)willRotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation duration:(NSTimeInterval)duration {

    if (toInterfaceOrientation == UIInterfaceOrientationLandscapeLeft || toInterfaceOrientation == UIInterfaceOrientationLandscapeRight) {
        [self resizeForLandscape];
    } else {
        [self resizeForPortrait];
    }
}

- (void) getOrientationandResize
{    
    if (UIDeviceOrientationIsLandscape([UIApplication sharedApplication].statusBarOrientation)) {
        [self resizeForLandscape];
    } else {
        [self resizeForPortrait];
    }
}

- (void)viewDidAppear:(BOOL)animated
{
    [super viewDidAppear:animated];
    [self getOrientationandResize];
}

我的脑袋即将爆炸。不仅视图颠倒了，而且从宽度上抢夺了20个像素，并给出了高度。任何人都可以向我解释这一点以及我如何/应该在我的视图中对元素进行编码以解释它？

我的故事板如下：

我的初步观点：

第一次旋转后（仍然很好）

旋转回肖像（因为边界值而全部搞砸了）

Answer 1

你几乎不应该在willRotateToInterfaceOrientation:duration:中进行布局。当系统向您发送willRotateToInterfaceOrientation:duration:时，尚未将您的视图框架更新为新尺寸。因此，通过咨询self.view.frame，您将框架用于当前（旧）方向，不框架用于新（尚未旋转到）方向。

您也不应该在viewDidAppear:中进行布局，因为当您收到viewDidAppear:时，您的视图已经显示在屏幕上。您需要在>之前进行布局布局。

您需要以适当的方法进行布局。布局的最佳位置是自定义layoutSubviews子类的UIView方法。将它放在那里可以使您的视图逻辑与控制器逻辑分开。

进行布局的下一个最佳位置是视图控制器的viewWillLayoutSubviews或viewDidLayoutSubviews方法。

如果您将布局代码放在layoutSubviews，viewWillLayoutSubviews或viewDidLayoutSubviews中，系统会在您的视图显示在屏幕上之前自动调用该方法，并在自动旋转的动画块内。在这两种情况下，它都会在发送消息之前更新视图的正确方向框架。

如果您需要在自动旋转动画开始之前隐藏视图，并在之后再次显示，则可以在willRotateToInterfaceOrientation:duration:和didRotateFromInterfaceOrientation:中执行此操作。

如果您想在自动旋转期间执行特殊动画 ，而不是在初始视图布局期间执行，则可以在willAnimateRotationToInterfaceOrientation:duration:中执行此操作，该动作在自动旋转的动画块内调用

您可能会发现此答案有用：UIViewController returns invalid frame?