你如何在 UIBarItem 中使用 setTitleTextAttributes:forState？答案

【问题标题】：How do you use setTitleTextAttributes:forState in UIBarItem?你如何在 UIBarItem 中使用 setTitleTextAttributes:forState？
【发布时间】：2011-12-10 06:24:39
【问题描述】：

如何在UIBarItem 中使用setTitleTextAttributes:forState: 在iOS 中？

如何设置NSDictionary？无法使其工作，文档对此也不是很清楚。

来自文档：

setTitleTextAttributes:forState:

为给定的控件状态设置标题的文本属性：

- (void)setTitleTextAttributes:(NSDictionary *)attributes 
                      forState:(UIControlState)state

参数：

attributes：包含文本属性键值对的字典。您可以使用 NSString UIKit Additions Reference 中列出的键指定字体、文本颜色、文本阴影颜色和文本阴影偏移量。

state：要为其设置标题文本属性的控件状态。

【问题讨论】：

标签： ios objective-c swift uinavigationcontroller uibaritem

【解决方案1】：

示例代码：

[[UIBarItem appearance] setTitleTextAttributes:
[NSDictionary dictionaryWithObjectsAndKeys:
[UIColor colorWithRed:220.0/255.0 green:104.0/255.0 blue:1.0/255.0 alpha:1.0], UITextAttributeTextColor, 
[UIColor colorWithRed:1.0 green:1.0 blue:1.0 alpha:1.0], UITextAttributeTextShadowColor, 
[NSValue valueWithUIOffset:UIOffsetMake(0, 1)], UITextAttributeTextShadowOffset, 
[UIFont fontWithName:@"AmericanTypewriter" size:0.0], UITextAttributeFont, nil] 
forState:UIControlStateNormal];

【讨论】：

NSValue 没有 valueWithUIOffset 方法。我的程序在你的代码中崩溃了。
见developer.apple.com/library/ios/#DOCUMENTATION/UIKit/Reference/…
UITextAttribute 从 iOS 7 开始已被弃用，您应该使用 NSAttributedString 类的值，例如，您应该使用 NSForegroundColorAttributeName 代替 UITextAttributeTextColor

【解决方案2】：

Swift 5.0：

// Bar title text color
let shadow = NSShadow()
shadow.shadowColor = UIColor(red: 1.0, green: 1.0, blue: 1.0, alpha: 1.0)
shadow.shadowOffset = CGSize(width: 0, height: 1)
let color : UIColor = UIColor(red: 220.0/255.0, green: 104.0/255.0, blue: 1.0/255.0, alpha: 1.0)
let titleFont : UIFont = UIFont(name: "AmericanTypewriter", size: 16.0)!

let attributes = [
    NSAttributedString.Key.foregroundColor : color,
    NSAttributedString.Key.shadow : shadow,
    NSAttributedString.Key.font : titleFont
]
self.navigationItem.rightBarButtonItem?.setTitleTextAttributes(attributes, for: .normal)

// Or you can use
UIBarItem.appearance().setTitleTextAttributes(attributes, for: .normal)

Swift 4.0：

// Bar title text color
let shadow = NSShadow()
shadow.shadowColor = UIColor(red: 1.0, green: 1.0, blue: 1.0, alpha: 1.0)
shadow.shadowOffset = CGSize(width: 0, height: 1)
let color : UIColor = UIColor(red: 220.0/255.0, green: 104.0/255.0, blue: 1.0/255.0, alpha: 1.0)
let titleFont : UIFont = UIFont(name: "AmericanTypewriter", size: 16.0)!

let attributes = [
        NSAttributedStringKey.foregroundColor : color,
        NSAttributedStringKey.shadow : shadow,
        NSAttributedStringKey.font : titleFont
    ]

self.navigationItem.rightBarButtonItem?.setTitleTextAttributes(attributes, for: UIControlState.normal)
// Or you can use
UIBarItem.appearance().setTitleTextAttributes(attributes, for: UIControlState.normal)

目标 C 代码：

NSShadow *shadow = [NSShadow new];
[shadow setShadowColor:[UIColor colorWithRed:1.0 green:1.0 blue:1.0 alpha:1.0]];
[shadow setShadowOffset:CGSizeMake(0, 1)];

NSDictionary *attributes = @{
                                NSForegroundColorAttributeName: [UIColor colorWithRed:220.0/255.0 green:104.0/255.0 blue:1.0/255.0 alpha:1.0],
                                NSShadowAttributeName: shadow,
                                NSFontAttributeName: [UIFont fontWithName:@"AmericanTypewriter" size:16.0]
                             };

[self.navigationItem.rightBarButtonItem setTitleTextAttributes:attributes forState: UIControlStateNormal];

// Or you can use.

[[UIBarItem appearance] setTitleTextAttributes:attributes forState: UIControlStateNormal];

【讨论】：

Swift 4 实际上如下：[NSAttributedStringKey.foregroundColor: color] 你应该更新你的代码。

【解决方案3】：

这是 phix23 的代码，只是经过更新，我认为语法更简洁：

[[UIBarItem appearance] setTitleTextAttributes:@{
                      UITextAttributeTextColor: [UIColor colorWithRed:220.0/255.0 green:104.0/255.0 blue:1.0/255.0 alpha:1.0],
                UITextAttributeTextShadowColor: [UIColor colorWithRed:1.0 green:1.0 blue:1.0 alpha:1.0],
               UITextAttributeTextShadowOffset: [NSValue valueWithUIOffset:UIOffsetMake(0, 1)],
                           UITextAttributeFont: [UIFont fontWithName:@"AmericanTypewriter" size:0.0]}
                                      forState: UIControlStateNormal];

【讨论】：

【解决方案4】：

[self.tabBarItem setTitleTextAttributes:[NSDictionary dictionaryWithObjects:[NSArray arrayWithObjects:[UIColor whiteColor], nil] forKeys:[NSArray arrayWithObjects:UITextAttributeTextColor, nil]] forState:UIControlStateNormal];

【讨论】：

【解决方案5】：

Swift5设置UIBarItem标题颜色

let attributes = [
    NSAttributedString.Key.foregroundColor : UIColor.orange,
    NSAttributedString.Key.font : UIFont.systemFont(ofSize: 20)
]
vc.tabBarItem.setTitleTextAttributes(attributes, for: .normal)

【讨论】：