使用单视图控制器使用情节提要的肖像和方向的自定义视图

Question

I have an app that requires me to have image views and labels to laid out differently depending on portrait or landscape orientation.

For example , in portrait mode, I have 2 UIImageViews on top and bottom that share the screen evenly. In landscape mode, the 2 UIImageViews are side by side. How can this be done using storyboard in Xcode 6 ?

Things I have tried:

1. Settings constraints on the views in storyboard with size classes. I set the base values for my 2 imageviews in w:Any h:Any , then moved to w:Compact h:Regular and set constraints for portrait view.Then I moved to w:Any h:Compact , moved the 2 imageviews side by side and set constraints for landscape view. Then I get conflicts in w:Compact h:Compact because of the constraints I have applied for and landscape and portrait orientation. I think it's because I moved the image views around for landscape orientation before settings the constraints that caused this problem.
2. Using 2 separate view controllers and have portrait view controller switch to landscape view controller when orientation changes using NSNotificationCenter and performSegueWithIdentifier to push the landscape view controller on top of my portrait view controller. This problem is that there's lots of data to be passed(lot of imageviews and labels).

Is the a way to use only one view controller and a way to rearrange the imageviews/labels and apply new constraints on them when the orientation changes? Is -(void)viewDidLayoutSubviews{} where I put the code to rearrange the image views? Can someone point me in the right directions? Thanks!

Answer 1

For this case I recommend to make layout programmatically via code. Here is example: https://dl.dropboxusercontent.com/u/48223929/Test.zip

- (void)viewDidLayoutSubviews
{
    [super viewDidLayoutSubviews];
    [self layoutImageViewsForViewSize:self.view.frame.size];
}

- (void)viewWillTransitionToSize:(CGSize)size withTransitionCoordinator:(id<UIViewControllerTransitionCoordinator>)coordinator
{
    [self layoutImageViewsForViewSize:size];
}

- (void)layoutImageViewsForViewSize:(CGSize)size
{
    // Portrait mode
    if (size.height > size.width) {
        self.imageView1.frame = CGRectMake(0, 0, size.width, size.height / 2);
        self.imageView2.frame = CGRectMake(0, size.height / 2, size.width, size.height / 2);
        // Landscape mode
    } else {
        self.imageView1.frame = CGRectMake(0, 0, size.width / 2, size.height);
        self.imageView2.frame = CGRectMake(size.width / 2, 0, size.width / 2, size.height);
    }
}

For autolayout:

- (void)layoutImageViewsForViewSize:(CGSize)size
{
    // Portrait mode
    [self.view removeConstraints:self.view.constraints];
    if (size.height > size.width) {
        NSString *heightLayoutFormatString = [NSString stringWithFormat:@"V:|[_imageView1(%.0f)][_imageView2(%.0f)]|", size.height / 2, size.height / 2];
        [self.view addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:heightLayoutFormatString options:0 metrics:nil views:NSDictionaryOfVariableBindings(_imageView1, _imageView2)]];
        [self.view addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:[NSString stringWithFormat:@"H:|[_imageView1(%.0f)]|", size.width] options:0 metrics:nil views:NSDictionaryOfVariableBindings(_imageView1)]];
        [self.view addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:[NSString stringWithFormat:@"H:|[_imageView2(%.0f)]|", size.width] options:0 metrics:nil views:NSDictionaryOfVariableBindings(_imageView2)]];

    // Landscape mode
    } else {
        NSString *widthLayoutFormatString = [NSString stringWithFormat:@"H:|[_imageView1(%.0f)][_imageView2(%.0f)]|", size.width / 2, size.width / 2];
        [self.view addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:widthLayoutFormatString options:0 metrics:nil views:NSDictionaryOfVariableBindings(_imageView1, _imageView2)]];
        [self.view addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:[NSString stringWithFormat:@"V:|[_imageView1(%.0f)]|", size.height] options:0 metrics:nil views:NSDictionaryOfVariableBindings(_imageView1)]];
        [self.view addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:[NSString stringWithFormat:@"V:|[_imageView2(%.0f)]|", size.height] options:0 metrics:nil views:NSDictionaryOfVariableBindings(_imageView2)]];
    }
    [self.view setNeedsUpdateConstraints];
}

Another solution for autolayout - make your custom subclass of UIView, which contains 2 image views, and layout it programmly without constraints - just setFrame. And then add this custom UIView to your storyboard