目标 c 中 didload 方法启动时的 LandscapeOrientation

Question

我制作了一个 iPad 应用程序，

当我第一次以纵向模式加载应用程序时，它工作正常，但是当我第一次以横向模式加载应用程序时，它仅采用纵向模式的坐标，因为在我的 < code>didLoad 方法我只给出纵向模式的坐标。

现在需要在我的 didLoad 方法中给出横向模式的坐标。

我在 didLoad 方法中尝试了此操作，

if (interfaceOrientation == UIInterfacePortraitmode ||
    interfaceOrientation == UIInterfaceUpsideDown)
{
    // do this....
}
else
{
    // do this....
}

但无法在 didLoad 方法中编写 if/else 的条件。

我应该怎么办？

Answer 1

您可以按如下方式进行处理 -

-(void) viewWillAppear: (BOOL) animated {
       [super viewWillAppear: animated];
       [self updateLayoutForNewOrientation: self.interfaceOrientation];
}

-(void) willAnimateRotationToInterfaceOrientation: (UIInterfaceOrientation) interfaceOrientation duration: (NSTimeInterval) duration {
       [self updateLayoutForNewOrientation: interfaceOrientation];
}

最后是自定义方法 -

- (void) updateLayoutForNewOrientation: (UIInterfaceOrientation) orientation {
    if (UIInterfaceOrientationIsLandscape(orientation)) {
         // Do some stuff
    } else {
         // Do some other stuff
    }

}

Answer 2

-(void) viewWillAppear: (BOOL) animated {
       [super viewWillAppear: animated];
       [self adjustViewtForNewOrientation: self.interfaceOrientation];
}

-(void) willAnimateRotationToInterfaceOrientation: (UIInterfaceOrientation) interfaceOrientation duration: (NSTimeInterval) duration {
       [self adjustViewtForNewOrientation: interfaceOrientation];
}


- (void) adjustViewtForNewOrientation: (UIInterfaceOrientation) orientation {
    if (UIInterfaceOrientationIsLandscape(orientation)) {
         // Do some stuff
    } else {
         // Do some other stuff
    }

还可以在 ViewDidLaod() 方法中调用 adjustViewtForNewOrientation ，

Answer 3

我对 UIScrollView 也有类似的问题。我通过按照此处的建议对齐子视图来修复它。

- (void)alignSubViews
{
    // Position all the content views at their respective page positions
    scrollView.contentSize = CGSizeMake(self.contentViews.count * scrollView.bounds.size.width,
                                        scrollView.bounds.size.height);
    NSUInteger i = 0;
    for (UIView *v in self.contentViews) {
        v.frame = CGRectMake(i * scrollView.bounds.size.width, 0,
                             scrollView.bounds.size.width, scrollView.bounds.size.height);
        i++;
    }
}

- (void)viewDidLoad
{
    [super viewDidLoad];

    //Setup subviews and then align the views.

    [self alignSubViews];
}

- (void)willAnimateRotationToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
                                         duration:(NSTimeInterval)duration 
{
    [self alignSubViews];
    scrollView.contentOffset = CGPointMake(self.currentPage * scrollView.bounds.size.width, 0);
}