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

Use this line of code

UILabel *badge_Label=[[UILabel alloc]initWithFrame:CGRectMake(5,3, 15, 15)];
badge_Label.backgroundColor=[UIColor redcolor];
badge_Label.font=[UIFont systemFontOfSize:12];
[badge_Label setText:@"20"];
[self.navigationController.navigationBar addSubview:badgelabel];

I think this will be helpful for you.

From 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]];

Or if you prefer with the object literal style:

[[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],
}];

Edit for iOS 7 and following

UITextAttributes are deprecate as iOS 7 you can use the following :

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]
}];

For deployment targets greater than or equal to iOS 6, you should use NSShadow instead:

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];

I did this by adding just few lines of code in AppDelegate.m class didFinishLaunchingWithOptions method: Use this code:

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];

it works for me...

Doing this on iOS 8+ and in Swift. There isn't a setTitleTextAttributes for the appearance object. Instead, do this:

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

This could be used to set a custom view to a single navigationBar instead of a global setting

- (void)updateTitleWithString:(NSString *)title
{
UIView *headerView = [[UIView alloc] initWithFrame:CGRectZero];
[headerView setAutoresizingMask:UIViewAutoresizingFlexibleWidth];
[headerView setAutoresizesSubviews:YES];


CGFloat headFontSize = (IS_SYSTEM_DEVICE_IPAD ? 25.0f : 19.0f);
UIFont *headFont = [UIFont boldSystemFontOfSize: headFontSize ];


NSMutableParagraphStyle *style = [[NSParagraphStyle defaultParagraphStyle] mutableCopy];
[style setLineBreakMode:NSLineBreakByTruncatingTail];


CGSize size = [title boundingRectWithSize:CGSizeMake(190,headFontSize + 6) options:NSStringDrawingUsesLineFragmentOrigin
attributes:@{NSFontAttributeName : headFont, NSParagraphStyleAttributeName : style} context:nil].size;


headerView.frame  = CGRectMake(0, 0,size.width,self.navigationController.navigationBar.frame.size.height);
float labelHeight = headFontSize + 6;
float labelYLoc   = (   self.navigationController.navigationBar.frame.size.height - labelHeight ) / 2;
UILabel *label    = [[UILabel alloc] initWithFrame:CGRectMake(0,labelYLoc, size.width,labelHeight)];
label.backgroundColor = [UIColor clearColor];
label.adjustsFontSizeToFitWidth = YES;
label.textAlignment = NSTextAlignmentCenter;
label.textColor = [UIColor whiteColor];
label.font = headFont;
label.text = title;
label.shadowColor = [UIColor colorWithWhite:0.0 alpha:0.4];
label.lineBreakMode = NSLineBreakByTruncatingTail;
label.shadowOffset = CGSizeMake(0,-1);
label.accessibilityLabel = @"<LABEL>";
[headerView addSubview:label];


self.navigationItem.titleView = headerView;
}

If you need to do this in Swift, you can create an extension for the UINavigationBar to allow you to get or set these settings.

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]
}
}
}
}

You can then set the color and font like this:

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