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我找不到在自定义中设置标题字体大小的方法UIBarButtonItem。我能想到的唯一方法是将其设置为图像，我想避免这种情况。还有其他建议吗？

4

6 回答 6

82

目标-C：

NSUInteger fontSize = 20;
UIFont *font = [UIFont boldSystemFontOfSize:fontSize];
NSDictionary *attributes = @{NSFontAttributeName: font};

UIBarButtonItem *item = [[UIBarButtonItem alloc] init];

[item setTitle:@"Some Text"];
[item setTitleTextAttributes:attributes forState:UIControlStateNormal];

self.navigationItem.rightBarButtonItem = item;

迅速：

let fontSize:CGFloat = 20;
let font:UIFont = UIFont.boldSystemFont(ofSize: fontSize);
let attributes:[String : Any] = [NSFontAttributeName: font];
    
let item = UIBarButtonItem.init();
    
item.title = "Some Text";
item.setTitleTextAttributes(attributes, for: UIControlState.normal);
    
self.navigationItem.rightBarButtonItem = item;
于 2012-07-07T21:07:54.520 回答
3

创建一个 UILabel 并使用-initWithCustomView:.

于 2010-04-27T13:27:10.623 回答
3

作为kennytm 建议的具体示例，您可以UIBarButtonItem使用以下内容创建：

UILabel *txtLabel = [[UILabel alloc] initWithFrame:rect];
txtLabel.backgroundColor = [UIColor clearColor];
txtLabel.textColor = [UIColor lightGrayColor];
txtLabel.text = @"This is a custom label";
UIBarButtonItem *btnText = [[[UIBarButtonItem alloc] initWithCustomView:txtLabel] autorelease];

然后，您可以将其添加为 a 上的居中文本UIToolbar，例如：

UIToolbar *toolBar = [[UIToolbar alloc] initWithFrame:rect];
toolBar.barStyle = UIBarStyleBlackTranslucent;
UIBarButtonItem *flexSpace1 = [[[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFlexibleSpace target:nil action:nil] autorelease];
UIBarButtonItem *flexSpace2 = [[[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFlexibleSpace target:nil action:nil] autorelease];

[toolBar setItems:[NSArray arrayWithItems:flexSpace1, btnText, flexSpace2, nil]];

（当然，为了获得正确的格式，rect用于初始化txtLabel并且toolBar应该是正确的大小......但这是另一个练习。）

于 2012-03-10T20:08:45.587 回答
2 
[[UIBarButtonItem appearance]setTitleTextAttributes:[NSDictionary dictionaryWithObjectsAndKeys:
                                                     [UIColor colorWithRed:245.0/255.0 green:245.0/255.0 blue:245.0/255.0 alpha:1.0], NSForegroundColorAttributeName,
                                                     [UIFont fontWithName:@"FONT-NAME" size:21.0], NSFontAttributeName, nil]
                                           forState:UIControlStateNormal];
于 2015-02-03T13:38:30.617 回答
2

斯威夫特5：

let item = UIBarButtonItem(title: "", style: .plain, target: self, action: #selector(self.onItemTapped))
let font:UIFont = UIFont(name: "", size: 18) ?? UIFont()
item.setTitleTextAttributes([NSAttributedString.Key.font: font], for: UIControl.State.normal)
于 2020-02-27T22:11:02.073 回答
1 
let barButtonItem: UIBarButtonItem = UIBarButtonItem(title: "Title",
                                                     style: .plain,
                                                     target: nil,
                                                     action: nil)
let font: UIFont = UIFont.systemFont(ofSize: 12.0)
let textAttributes: [NSAttributedString.Key: Any] = [.font: font]

barButtonItem.setTitleTextAttributes(textAttributes, for: .normal)
barButtonItem.setTitleTextAttributes(textAttributes, for: .selected)
于 2021-02-04T20:34:46.123 回答