UIViewController's Workaround

gistfile1.txt

@interface UIViewController (XXX)

/**
 iOS8 && iPadの時にmodalPresentationStyleの種類によっては
 horizontalSizeClassがUIUserInterfaceSizeClassCompactになるので
 TraitCollectionを書き換える。
 現在判明しているのは
    * UIModalPresentationFormSheet

 */
- (void)xxx_overrideTraitCollectionForModalPresentation;

/**
 自動調整対象外のUIScrollViewのcontentInsetsを調整する。
 また、iOS8でcontentOffsetが自動調整されないため、
 それも調整する。

 UIViewController.view
    - subview[0]
    - subview[1](UIScrollView) <- これ

 */
- (void)xxx_manuallyAdjustsScrollViewInsetsAndOffset:(UIScrollView *)scrollView;

@end


@implementation UIViewController (XXX)

- (void)xxx_overrideTraitCollectionForModalPresentation
{
    if (!SYSTEM_VERSION_LESS_THAN(@"8.0")) {
        if (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad) {
            if (self.parentViewController.modalPresentationStyle == UIModalPresentationFormSheet) {
                [self.parentViewController setOverrideTraitCollection:
                 [UITraitCollection traitCollectionWithHorizontalSizeClass:UIUserInterfaceSizeClassRegular]
                                               forChildViewController:self];
            }
        }
    }
}

- (void)xxx_manuallyAdjustsScrollViewInsetsAndOffset:(UIScrollView *)scrollView
{
    UIEdgeInsets currentInsets = scrollView.contentInset;
    UIEdgeInsets insets = currentInsets;
    UIViewController *parent = self;
    while (parent.parentViewController.parentViewController) {
        parent = parent.parentViewController;
    }
    insets.top = parent.topLayoutGuide.length;
    insets.bottom = parent.bottomLayoutGuide.length;
    if (!UIEdgeInsetsEqualToEdgeInsets(currentInsets, insets)) {
        scrollView.contentInset = insets;
        scrollView.scrollIndicatorInsets = insets;

        // iOS8でcontentOffsetが調整されないのを対処
        if (!SYSTEM_VERSION_LESS_THAN(@"8.0")) {
            CGFloat d = insets.top + insets.bottom;
            [scrollView setContentOffset:CGPointMake(0, -d) animated:NO];
        }
    }
}

@end

@implementation UINavigationController (XXX)

/**
 http://qiita.com/yusuga_/items/d3097956026553ef9869
 */
- (BOOL)disablesAutomaticKeyboardDismissal
{
    // return NO;
    return [self.visibleViewController disablesAutomaticKeyboardDismissal];
}

@end

#define SYSTEM_VERSION_LESS_THAN(v) \
    ( [[[UIDevice currentDevice] systemVersion] compare:v options:NSNumericSearch] == NSOrderedAscending )