iphone - 添加到窗口后自动调整 UIView 的大小

Question

注意:这可能与Subview Doesnt AutoSize When Added to Root View Controller重复。

<小时/>

我有一个 iPad 应用程序，可以在其主窗口的不同 View 之间切换。 View 切换代码如下所示:

- (void)switchToViewController:(UIViewController*)viewController {
    if (currentViewController != viewController) {
        [currentViewController.view removeFromSuperview];
        currentViewController = viewController;
        [window addSubview:viewController.view];
    }
}

问题是，当新 View (UISplitView)以横向显示时，它的大小无法填充整个窗口。右侧有一大片空白的黑色空间。看起来 View 只有 768 像素宽，而不是横向窗口的 1024 像素宽。

如果我将设备旋转为纵向，然后返回横向， View 会自动调整大小。

如果设备处于纵向，则一切正常。如果 UISplitView 是我显示的第一个 View ，它的大小也会正确调整。仅当我在横向显示另一个 View 后切换到它时，才会出现此问题。

那么，有什么方法可以强制 iPhone 操作系统在将 View 添加到窗口后调整 View 大小吗？

我尝试调用 sizeToFit 和 setNeedsLayout。我还尝试将 View 的边界设置为窗口的边界，并且尝试设置框架以匹配前一个 View 的框架。

Answer 1

这绝对是可能的! :-)

您可以在这里查看我的存储库: https://github.com/hfossli/AGWindowView

它将自动处理任何旋转和帧更改，因此您不必担心。

如果您想担心这一点，那么您可以剪切并粘贴最重要的部分

# 1 将 View 添加到窗口

[[UIApplication sharedApplication] keyWindow] addSubview:aView];

#2 添加监听器并更新 View

[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(statusBarFrameOrOrientationChanged:) name:UIApplicationDidChangeStatusBarOrientationNotification object:nil];
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(statusBarFrameOrOrientationChanged:) name:UIApplicationDidChangeStatusBarFrameNotification object:nil];

记得删除通知监听

[[NSNotificationCenter defaultCenter] removeObserver:self];

# 3 算一下

- (void)statusBarFrameOrOrientationChanged:(NSNotification *)notification
{
    /*
     This notification is most likely triggered inside an animation block,
     therefore no animation is needed to perform this nice transition.
     */
    [self rotateAccordingToStatusBarOrientationAndSupportedOrientations];
}

- (void)rotateAccordingToStatusBarOrientationAndSupportedOrientations
{
    UIInterfaceOrientation statusBarOrientation = [UIApplication sharedApplication].statusBarOrientation;
    CGFloat angle = UIInterfaceOrientationAngleOfOrientation(statusBarOrientation);
    CGFloat statusBarHeight = [[self class] getStatusBarHeight];

    CGAffineTransform transform = CGAffineTransformMakeRotation(angle);
    CGRect frame = [[self class] rectInWindowBounds:self.window.bounds statusBarOrientation:statusBarOrientation statusBarHeight:statusBarHeight];

    [self setIfNotEqualTransform:transform frame:frame];
}

- (void)setIfNotEqualTransform:(CGAffineTransform)transform frame:(CGRect)frame
{
    if(!CGAffineTransformEqualToTransform(self.transform, transform))
    {
        self.transform = transform;
    }
    if(!CGRectEqualToRect(self.frame, frame))
    {
        self.frame = frame;
    }
}

+ (CGFloat)getStatusBarHeight
{
    UIInterfaceOrientation orientation = [UIApplication sharedApplication].statusBarOrientation;
    if(UIInterfaceOrientationIsLandscape(orientation))
    {
        return [UIApplication sharedApplication].statusBarFrame.size.width;
    }
    else
    {
        return [UIApplication sharedApplication].statusBarFrame.size.height;
    }
}

+ (CGRect)rectInWindowBounds:(CGRect)windowBounds statusBarOrientation:(UIInterfaceOrientation)statusBarOrientation statusBarHeight:(CGFloat)statusBarHeight
{    
    CGRect frame = windowBounds;
    frame.origin.x += statusBarOrientation == UIInterfaceOrientationLandscapeLeft ? statusBarHeight : 0;
    frame.origin.y += statusBarOrientation == UIInterfaceOrientationPortrait ? statusBarHeight : 0;
    frame.size.width -= UIInterfaceOrientationIsLandscape(statusBarOrientation) ? statusBarHeight : 0;
    frame.size.height -= UIInterfaceOrientationIsPortrait(statusBarOrientation) ? statusBarHeight : 0;
    return frame;
}

CGFloat UIInterfaceOrientationAngleOfOrientation(UIInterfaceOrientation orientation)
{
    CGFloat angle;

    switch (orientation)
    {
        case UIInterfaceOrientationPortraitUpsideDown:
            angle = M_PI;
            break;
        case UIInterfaceOrientationLandscapeLeft:
            angle = -M_PI_2;
            break;
        case UIInterfaceOrientationLandscapeRight:
            angle = M_PI_2;
            break;
        default:
            angle = 0.0;
            break;
    }

    return angle;
}

UIInterfaceOrientationMask UIInterfaceOrientationMaskFromOrientation(UIInterfaceOrientation orientation)
{
    return 1 << orientation;
}

祝你好运!