更改 tabbaritem 的字体大小

Question

是否可以更改选项卡的字体大小？

Answer 1

我推荐一个更好的方法：

[yourTabBarItem setTitleTextAttributes:[NSDictionary dictionaryWithObjectsAndKeys:
    [UIColor whiteColor], UITextAttributeTextColor, 
    [NSValue valueWithUIOffset:UIOffsetMake(0,0)], UITextAttributeTextShadowOffset, 
    [UIFont fontWithName:@"Helvetica" size:18.0], UITextAttributeFont, nil]
    forState:UIControlStateNormal];

Answer 2

for(UIViewController *tab in  self.tabBarController.viewControllers)

{        
  [tab.tabBarItem setTitleTextAttributes:[NSDictionary dictionaryWithObjectsAndKeys:
  [UIFont fontWithName:@"Helvetica" size:20.0], UITextAttributeFont, nil]
  forState:UIControlStateNormal];
}

Answer 3

在 Swift 2.0

override func viewDidLoad() {
    super.viewDidLoad()

   let appearance = UITabBarItem.appearance()
   let attributes: [String: AnyObject] = [NSFontAttributeName:UIFont(name: "American Typewriter", size: 12)!, NSForegroundColorAttributeName: UIColor.orangeColor()]
   appearance.setTitleTextAttributes(attributes, forState: .Normal)

}

在 Swift 3.0 中

override func viewDidLoad() {
    super.viewDidLoad()

    let appearance = UITabBarItem.appearance()
    let attributes: [String: AnyObject] = [NSFontAttributeName:UIFont(name: "American Typewriter", size: 12)!, NSForegroundColorAttributeName: UIColor.orange]
    appearance.setTitleTextAttributes(attributes, for: .normal)
}

Answer 4

[更新] iOS 7.0+ 版本 @cancer86 的好答案：

[[UITabBarItem appearance] setTitleTextAttributes:[NSDictionary dictionaryWithObjectsAndKeys:
                                                   [UIColor whiteColor], NSForegroundColorAttributeName,
                                                   [UIFont fontWithName:@"Helvetica" size:tabFontSize],
                                                   NSFontAttributeName,
                                                   nil] forState:UIControlStateNormal];

[[UITabBarItem appearance] setTitleTextAttributes:[NSDictionary dictionaryWithObjectsAndKeys:
                                                   [UIColor redColor], NSForegroundColorAttributeName,
                                                   [UIFont fontWithName:@"Helvetica" size:tabFontSize], NSFontAttributeName,
                                                   nil] forState:UIControlStateSelected];

主要变化是 UITextAttributeTextColor 和 UITextAttributeFont 均已弃用，

以便将其应用于所有选项卡（感谢 @ToolmakerSteve 指出）

for(UIViewController *tab in  self.tabBarController.viewControllers)
{        
    [tab.tabBarItem setTitleTextAttributes: ...];
}

Answer 5

在 iOS 5.0 或更高版本中很简单：

[[UITabBarItem appearance] setTitleTextAttributes:@{UITextAttributeFont:[UIFont boldSystemFontOfSize:15]} forState:UIControlStateNormal];

Answer 6

TabBarIncreaseFonts(self.tabBarController);


void TabBarIncreaseFonts(UITabBarController* customTabBarController)
{

    for(UIView* controlLevelFirst in [customTabBarController.tabBar subviews])
    {

        if(![controlLevelFirst isKindOfClass:NSClassFromString(@"UITabBarButton")])
            continue;

        for(id controlLevelSecond in [controlLevelFirst subviews])
        {
            [controlLevelSecond setBounds: CGRectMake(0, 0, 100, 48)];

            if(![controlLevelSecond isKindOfClass:NSClassFromString(@"UITabBarButtonLabel")])
                 continue;

             [controlLevelSecond setFont: [UIFont boldSystemFontOfSize:20]]; 
             [controlLevelSecond setFrame: CGRectMake(0, 0, 96, 48)];
             [controlLevelSecond setTextAlignment:UITextAlignmentCenter];
        }
    }
}

Answer 7

我认为 Swift 中的这可以清晰地控制选项卡栏颜色和文本属性。

class MyTabBarController: UITabBarController {

  override func viewDidLoad() {
    super.viewDidLoad()
    tabBar.barTintColor = UIColor.green

    UITabBarItem.appearance().setTitleTextAttributes(
        [NSAttributedString.Key.font:UIFont.boldSystemFont(ofSize: 18), 
           NSAttributedString.Key.foregroundColor: UIColor.orange], for: .normal)
...             

Answer 8

[将其留在这里供我自己参考，只是对其他工作答案的即兴发挥。对于我来说，这是针对 iOS 7 的修复，这有点超出了问题......]

@implementation UITabBarController (Util)

- (void) fixForIos7 {
    if (!IS_IOS7)
        return;
    UIFont *tabBarFont = [UIFont systemFontOfSize:12];
    NSDictionary *titleTextAttributes = [NSDictionary dictionaryWithObjectsAndKeys:
            tabBarFont, UITextAttributeFont, nil];
    for(UIViewController *tab in  self.viewControllers) {
      [tab.tabBarItem setTitleTextAttributes:titleTextAttributes forState:UIControlStateNormal];
    }
}
@end

缺少的方法是

#define IS_IOS7 ( UIDevice.currentDevice.systemVersion.floatValue > 6.9 )

Answer 9

在 Swift 4 中

 override func viewDidLoad() {
        super.viewDidLoad()
        let appearance = UITabBarItem.appearance()
        let attributes: [NSAttributedString.Key: AnyObject] = [NSAttributedString.Key(rawValue: NSAttributedString.Key.font.rawValue):UIFont(name: "American Typewriter", size: 12)!, NSAttributedString.Key(rawValue: NSAttributedString.Key.foregroundColor.rawValue): UIColor.orange]
        appearance.setTitleTextAttributes(attributes, for: .normal)

    }

Answer 10

其实是有办法的。

    NSMutableArray *tabBarItems = [[[[[self.view subviews] objectAtIndex:1] subviews] mutableCopy] autorelease];

for (int item = 0; item < [tabBarItems count]; item++) {
    for (int subview = 0; subview < [[[tabBarItems objectAtIndex:item] subviews] count]; subview++) {
        for (int item = 0; item < [tabBarItems count]; item++)  {
            for (int subview = 0; subview < [[[tabBarItems objectAtIndex:item] subviews] count]; subview++)  {
                if ([[[[tabBarItems objectAtIndex:item] subviews] objectAtIndex:subview] isKindOfClass:NSClassFromString(@"UITabBarButtonLabel")]) 
                    [[[[tabBarItems objectAtIndex:item] subviews] objectAtIndex:subview] setFont:[UIFont systemFontOfSize:6.0f]];
            }
        }
    }
}

Answer 11

Xcode 13 和 Swift 5+

您可以从自定义扩展类更改选项卡栏项目字体属性。

例如，

1. 创建一个扩展文件 (.swift) 并放置以下代码

import UIKit

@IBDesignable
extension UITabBarItem {

@IBInspectable var fontSize : CGFloat{
    set{
        if(newValue > 0){
            let barItemFontAttributes = [NSAttributedString.Key.font : UIFont(name: "Avenir", size: newValue)]
            self.setTitleTextAttributes(barItemFontAttributes as [NSAttributedString.Key : Any], for: .normal)
        }
    }
    get{
        return self.fontSize
    }
}

2. 更改字体大小

现在您可以从属性检查器

如果有更好的方法请指出！

Answer 12

你必须从ios 13开始改变这样做的方式

    let attributesSelected: [NSAttributedString.Key: AnyObject] = [NSAttributedString.Key(rawValue: NSAttributedString.Key.font.rawValue):UIFont(name: "Montserrat-Bold", size: 13)!, NSAttributedString.Key(rawValue: NSAttributedString.Key.foregroundColor.rawValue): UIColor.primary]
    
    let attributesDefault: [NSAttributedString.Key: AnyObject] = [NSAttributedString.Key(rawValue: NSAttributedString.Key.font.rawValue):UIFont(name: "Montserrat-Bold", size: 13)!]
    
    if #available(iOS 13.0, *) {
        
        let tabBarAppearance = UITabBarAppearance()
        let tabBarItemAppearance = UITabBarItemAppearance()
        tabBarItemAppearance.selected.titleTextAttributes = attributesSelected
        tabBarItemAppearance.normal.titleTextAttributes = attributesDefault
        tabBarAppearance.stackedLayoutAppearance = tabBarItemAppearance
        tabBar.standardAppearance = tabBarAppearance
        
    } else {
               
        UITabBarItem.appearance().setTitleTextAttributes(
            attributesSelected, for: .selected)
        UITabBarItem.appearance().setTitleTextAttributes(
            attributesDefault, for: .normal)
    }