13

当我的应用程序启动时,我的视图边界的 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得到以下信息:

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肖像时,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,它们还没有完成,因为我目前正在为新 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;
}

调用者:

-(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];
}

我的头快要爆炸了。不仅视图被颠倒了,而且从宽度上抢走了 20 个像素并赋予了高度。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吗?

我的故事板如下:

在此处输入图像描述

我的初步看法: 在此处输入图像描述

第一次旋转后(仍然很好) 在此处输入图像描述

旋转回纵向(由于边界值而全部搞砸了) 在此处输入图像描述

4

1 回答 1

48

你几乎不应该在willRotateToInterfaceOrientation:duration:. 当系统发送给您时willRotateToInterfaceOrientation:duration:它并没有将您的视图框架更新为新的大小。因此,通过咨询self.view.frame,您使用的是当前(旧)方向的框架,而不是新(尚未旋转到)方向的框架。

您也不应该在 中进行布局viewDidAppear:,因为当您收到viewDidAppear:时,您的视图已经在屏幕上。您需要在视图出现在屏幕上之前进行布局。

您需要以适当的方法进行布局。最好的布局是在layoutSubviews自定义UIView子类的方法中。把它放在那里可以让你的视图逻辑与你的控制器逻辑分开。

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

如果您将布局代码放在layoutSubviewsviewWillLayoutSubviewsviewDidLayoutSubviews中,系统将在您的视图出现在屏幕上之前以及在自动旋转的动画块内自动调用该方法。在这两种情况下,它都会在向您发送消息之前更新您的视图框架以获得正确的方向。

如果您需要在自动旋转动画开始之前隐藏视图,然后再次显示它,您可以在willRotateToInterfaceOrientation:duration:和中执行此操作didRotateFromInterfaceOrientation:

如果您只想在自动旋转期间而不是在初始视图布局期间执行特殊动画您可以在 中执行此操作willAnimateRotationToInterfaceOrientation:duration:,这在自动旋转的动画块内调用。

您可能会发现这个答案很有帮助:UIViewController 返回无效帧?

于 2012-09-13T19:11:30.717 回答