ios - 为什么 UISegementedControl 的 setTitleTextAttributes 只更改文本颜色而不更改活动状态的字体/粗细？

Question

使用以下代码，我尝试更改 UISegmentedControl 的外观，但只有文本颜色会随着突出显示或选定的选项卡而改变。字体和粗细取自非活动属性，因此分段控件的所有部分都在标题标签上显示 Futura-Medium，无论是突出显示、选中还是正常。为什么是这样？

NSDictionary *attributesActive = [NSDictionary dictionaryWithObjectsAndKeys:
        [UIFont fontWithName:@"AmericanTypewriter-Bold" size:22.f], UITextAttributeFont,
        [UIColor redColor], UITextAttributeTextColor,
        [UIColor clearColor], UITextAttributeTextShadowColor,
        nil];
NSDictionary *attributesInactive = [NSDictionary dictionaryWithObjectsAndKeys:
        [UIFont fontWithName:@"Futura-Medium" size:16.f], UITextAttributeFont,
        [UIColor greenColor], UITextAttributeTextColor,
        [UIColor clearColor], UITextAttributeTextShadowColor,
        nil];

[segmentedControl setTitleTextAttributes:attributesActive forState:UIControlStateHighlighted];
[segmentedControl setTitleTextAttributes:attributesActive forState:UIControlStateSelected];
[segmentedControl setTitleTextAttributes:attributesInactive forState:UIControlStateNormal];