添加到窗口后自动调整UIView大小

注意:这可能是添加到根视图控制器时Subview不自动调整大小的副本

我有一个iPad应用程序在其主窗口中切换不同的视图.视图切换代码如下所示:

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

问题是当新视图(UISplitView)以横向方向显示时,其大小不足以填充整个窗口.右边有一个空的黑色大空间.看起来视图只有768像素宽,而不是景观窗口的1024像素宽度.

如果我将设备旋转为纵向然后返回横向,则视图会自行调整大小.

如果设备处于纵向,一切正常.如果它是我展示的第一个视图,UISplitView也会正确调整大小.如果我在横向显示另一个视图后切换到它,则只会出现此问题.

那么,是否有某种方法可以强制iPhone OS在将视图添加到窗口后调整视图大小？

我已经打过电话sizeToFit,和setNeedsLayout.我也尝试将视图设置为bounds窗口bounds,我尝试将其设置frame为匹配上一个视图的帧.

这绝对是可能的!:-)

你可以在这里查看我的回购:https: //github.com/hfossli/AGWindowView

它将自动处理任何旋转和帧更改,因此您不必担心这一点.

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将视图添加到窗口

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

#2添加监听器和更新视图

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

请记住删除通知收听

[[NSNotificationCenter defaultCenter] removeObserver:self];

#3算一算

- (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;
}

祝好运!