更改traitCollectionDidChange上的字体大小

Question

我试图绕过愚蠢的苹果‘没有自定义字体与自动布局’的错误，但我遇到了问题，实现它的一种方式，也将工作特点收集更新。

我最初是在viewDidLoad上的延迟调用函数的0.5个延迟时间上运行代码的，在那里，它正确地更新了设备的字体大小和字体类型。但是，我了解到traitCollectionDidChange在这段时间内也被调用，所以我将代码移到那里。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，这可能是我忽略的愚蠢之处：

- (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

我终于想明白了。当转换的动画完成后，我必须找到一种更新的方法，并且我找到了通过传递给UIViewControllerTransitionCoordinator的willTransitionToTraitCollection来进行更新的方法。我还必须在viewDidLoad中调用我的字体方法，因为willTransitionToTraitCollection只在设置转换时调用，这不会在应用程序加载时运行，也不会在IPad上运行。

下面是我的代码：

- (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;
    }
}