如何使用iOS5外观API在UINavigationBar中设置标题的字体和颜色？

Question

我有一个多个视图控制器,我想将所有字体颜色设置为红色.

 [[UINavigationBar appearance] setFont:[UIFont boldSystemFontOfSize:12.0]];

抛出一个无法识别的选择器错误.

请提供代码,以帮助解决以下问题.

Answer 1

来自Ray Wenderlich:

http://www.raywenderlich.com/4344/user-interface-customization-in-ios-5

// Customize the title text for *all* UINavigationBars
[[UINavigationBar appearance] setTitleTextAttributes:
    [NSDictionary dictionaryWithObjectsAndKeys:
        [UIColor colorWithRed:255.0/255.0 green:255.0/255.0 blue:255.0/255.0 alpha:1.0], 
        UITextAttributeTextColor, 
        [UIColor colorWithRed:0.0 green:0.0 blue:0.0 alpha:0.8], 
        UITextAttributeTextShadowColor, 
        [NSValue valueWithUIOffset:UIOffsetMake(0, -1)], 
        UITextAttributeTextShadowOffset, 
        [UIFont fontWithName:@"Arial-Bold" size:0.0], 
        UITextAttributeFont, 
        nil]];

或者如果您更喜欢对象文字样式:

[[UINavigationBar appearance] setTitleTextAttributes:@{
    UITextAttributeTextColor: [UIColor colorWithRed:255.0/255.0 green:255.0/255.0 blue:255.0/255.0 alpha:1.0],
    UITextAttributeTextShadowColor: [UIColor colorWithRed:0.0 green:0.0 blue:0.0 alpha:0.8],
    UITextAttributeTextShadowOffset: [NSValue valueWithUIOffset:UIOffsetMake(0, -1)],
    UITextAttributeFont: [UIFont fontWithName:@"Arial-Bold" size:0.0],
}];

编辑iOS 7及以下版本

UITextAttributes作为iOS 7弃用,您可以使用以下内容:

NSShadow *shadow = [[NSShadow alloc] init];
shadow.shadowColor = [UIColor colorWithWhite:.0f alpha:1.f];
shadow.shadowOffset = CGSizeMake(0, -1);

[[UINavigationBar appearance] setTitleTextAttributes:@{
     NSForegroundColorAttributeName: [UIColor whiteColor],
     NSShadowAttributeName: shadow,
     NSFontAttributeName: [UIFont fontWithName:@"Arial-Bold" size:15.0f]
     }];

Answer 2

对于大于或等于iOS 6的部署目标,您应该使用NSShadow:

NSShadow * shadow = [[NSShadow alloc] init];
shadow.shadowColor = [UIColor lightGrayColor];
shadow.shadowOffset = CGSizeMake(0, -2);

NSDictionary * navBarTitleTextAttributes =
@{ NSForegroundColorAttributeName : [UIColor redColor],
   NSShadowAttributeName          : shadow,
   NSFontAttributeName            : [UIFont systemFontOfSize:14] };

[[UINavigationBar appearance] setTitleTextAttributes:navBarTitleTextAttributes];

Answer 3

在iOS 8+和Swift中执行此操作.没有一个setTitleTextAttributes对外观对象.相反,这样做:

UINavigationBar.appearance().titleTextAttributes = [NSFontAttributeName : AppTheme.fontWithSize(18)]

Answer 4

我这样做是通过在AppDelegate.m类中添加几行代码didFinishLaunchingWithOptions方法:使用此代码:

NSDictionary *navbarTitleTextAttributes = [NSDictionary dictionaryWithObjectsAndKeys:
                                           [UIColor colorWithRed:255.0f/255.0f green:0.0f/255.0f blue:0.0f/255.0f alpha:1.0],UITextAttributeTextColor,
                                           [UIColor clearColor], UITextAttributeTextShadowColor,
                                           [NSValue valueWithUIOffset:UIOffsetMake(-1, 0)], UITextAttributeTextShadowOffset, nil];

[[UINavigationBar appearance] setTitleTextAttributes:navbarTitleTextAttributes];

这个对我有用...

Answer 5

如果需要在Swift中执行此操作,可以为UINavigationBar创建扩展,以允许您获取或设置这些设置.

extension UINavigationBar {
var titleColor: UIColor? {
    get {
        if let attributes = self.titleTextAttributes {
            return attributes[NSForegroundColorAttributeName] as? UIColor
        }
        return nil
    }
    set {
        if let value = newValue {
            self.titleTextAttributes = [NSForegroundColorAttributeName: value]
        }
    }
}

var titleFont: UIFont? {
    get {
        if let attributes = self.titleTextAttributes {
            return attributes[NSFontAttributeName] as? UIFont
        }
        return nil
    }
    set {
        if let value = newValue {
            self.titleTextAttributes = [NSFontAttributeName: value]
        }
    }
    }
}

然后,您可以设置颜色和字体,如下所示:

navigationBar.titleColor = UIColor.redColor()
navigationBar.titleFont = UIFont.systemFontOfSize(12)