在 traitCollectionDidChange 上更改字体大小

Question

我正在尝试解决愚蠢的 Apple '没有带有自动布局的自定义字体' 的错误，但我遇到了以一种也适用于特征集合更新的方式实现它的问题。

我最初是在 viewDidLoad 上的延迟调用函数中以 0.5 的延迟运行代码，并且在那里它正在为设备正确更新字体大小和字体类型。但是，我了解到在那段时间也调用了 traitCollectionDidChange，所以我将代码移到了那里。现在字体类型没有更新，但字体大小正在更新。

这是我的代码，我可能忽略了一些愚蠢的东西：

- (void)traitCollectionDidChange:(UITraitCollection *)previousTraitCollection{
    //[super traitCollectionDidChange: previousTraitCollection];
    //Create horz/vert vars for easier iffing
    UIUserInterfaceSizeClass viewHorizontal = self.view.traitCollection.horizontalSizeClass;
    UIUserInterfaceSizeClass viewVertical = self.view.traitCollection.verticalSizeClass;

    //Change font and font size depending on classes; really just the size but we need to set the font anyway
    if (viewHorizontal == UIUserInterfaceSizeClassCompact && viewVertical == UIUserInterfaceSizeClassCompact){
        agTtl_Text.font = [UIFont fontWithName:@"Hobo Std" size:36];
        agSubttl_Text.font = [UIFont fontWithName:@"Hobo Std" size:20];
        actBtn.titleLabel.font = [UIFont fontWithName:@"Hobo Std" size:20];
        nAccBtn.titleLabel.font = [UIFont fontWithName:@"Hobo Std" size:20];
    } else if (viewHorizontal == UIUserInterfaceSizeClassCompact && viewVertical == UIUserInterfaceSizeClassRegular){
        agTtl_Text.editable = YES; //still need this iOS 6 hack?
        agTtl_Text.font = [UIFont fontWithName:@"Hobo Std" size:35];
        agSubttl_Text.font = [UIFont fontWithName:@"Hobo Std" size:20];
        actBtn.titleLabel.font = [UIFont fontWithName:@"Hobo Std" size:30];
        nAccBtn.titleLabel.font = [UIFont fontWithName:@"Hobo Std" size:30];

        agTtl_Text.editable = NO; //still need this iOS 6 hack?
    }
}

Answer 1

我终于想通了。一旦过渡动画完成，我必须找到一种更新方法，并且我通过传递给 willTransitionToTraitCollection 的 UIViewControllerTransitionCoordinator 找到了更新方法。我还必须在 viewDidLoad 中调用我的字体方法以及初始设置，因为 willTransitionToTraitCollection 仅在设置转换时调用，并且不会在应用加载时运行，也永远不会在 iPad 上运行。

这是我现在的代码：

- (void)viewDidLoad
{
    [self performSelector:@selector(setFontSettings) withObject:nil afterDelay:0.5];

    rtnMsg = [[NSMutableArray alloc] init];
    db = [[Database alloc] init];

    rtnMsg = [db bDoesDBExist];

    if ([rtnMsg[0] boolValue] == NO){
        [actBtn setTitle:@"Tap Here to Begin" forState:UIControlStateNormal];
        bDBExists = NO;
    } else{
        //status.text = @"Found database";
        [actBtn setTitle:@"Tap Here to Login" forState:UIControlStateNormal];
        nAccBtn.hidden = NO;
        nAccBtn.enabled = YES;
        bDBExists = YES;
        //self.navigationItem.title=@"New Patient Profile Creator";
    }

    [super viewDidLoad];
}

- (void)willTransitionToTraitCollection:(UITraitCollection *)newCollection withTransitionCoordinator:(id<UIViewControllerTransitionCoordinator>)coordinator{
    [coordinator animateAlongsideTransition:nil completion:^(id<UIViewControllerTransitionCoordinatorContext> context) {
        [self setFontSettings];

    }];
}

- (void)setFontSettings{
    //[super traitCollectionDidChange: previousTraitCollection];
    //Create horz/vert vars for easier iffing
    UIUserInterfaceSizeClass viewHorizontal = self.view.traitCollection.horizontalSizeClass;
    UIUserInterfaceSizeClass viewVertical = self.view.traitCollection.verticalSizeClass;

    //Change font and font size depending on classes; really just the size but we need to set the font anyway
    if (viewHorizontal == UIUserInterfaceSizeClassCompact && viewVertical == UIUserInterfaceSizeClassCompact){
        agTtl_Text.font = [UIFont fontWithName:@"Hobo Std" size:36];
        agSubttl_Text.font = [UIFont fontWithName:@"Hobo Std" size:20];
        actBtn.titleLabel.font = [UIFont fontWithName:@"Hobo Std" size:20];
        nAccBtn.titleLabel.font = [UIFont fontWithName:@"Hobo Std" size:20];
    } else if (viewHorizontal == UIUserInterfaceSizeClassCompact && viewVertical == UIUserInterfaceSizeClassRegular){
        agTtl_Text.editable = YES;
        agTtl_Text.font = [UIFont fontWithName:@"Hobo Std" size:35];
        agSubttl_Text.font = [UIFont fontWithName:@"Hobo Std" size:20];
        actBtn.titleLabel.font = [UIFont fontWithName:@"Hobo Std" size:30];
        nAccBtn.titleLabel.font = [UIFont fontWithName:@"Hobo Std" size:30];

        agTtl_Text.editable = NO;
    } else if ((viewHorizontal == UIUserInterfaceSizeClassRegular && viewVertical == UIUserInterfaceSizeClassRegular) ||
               (viewHorizontal == UIUserInterfaceSizeClassRegular && viewVertical == UIUserInterfaceSizeClassCompact)){
        agTtl_Text.editable = YES;
        agTtl_Text.font = [UIFont fontWithName:@"Hobo Std" size:50];
        agSubttl_Text.font = [UIFont fontWithName:@"Hobo Std" size:34];
        actBtn.titleLabel.font = [UIFont fontWithName:@"Hobo Std" size:30];
        nAccBtn.titleLabel.font = [UIFont fontWithName:@"Hobo Std" size:30];

        agTtl_Text.editable = NO;
    }
}