更改NavigationItem的字体

Question

我已经使用以下代码更改了NavigationItem的标题：

self.navigationItem.title = @"My Name is ABC";

如何更改字体大小和字体？

Answer 1

示例代码：

CGRect frame = CGRectMake(0, 0, 400, 44);
UILabel *label = [[[UILabel alloc] initWithFrame:frame] autorelease];
label.backgroundColor = [UIColor clearColor];
label.font = [UIFont boldSystemFontOfSize:8.0];
label.textAlignment = UITextAlignmentCenter;
label.textColor = [UIColor whiteColor];
label.text = @"Sample custom Title With small Fonts ";
self.navigationItem.titleView = label;

Answer 2

从iOS5+开始，您可以使用UIAppearance protocol更改导航标题的字体，代码如下：

NSMutableDictionary *titleBarAttributes = [NSMutableDictionary dictionaryWithDictionary: [[UINavigationBar appearance] titleTextAttributes]];
[titleBarAttributes setValue:[UIFont fontWithName:@"Helvetica-Bold" size:18] forKey:UITextAttributeFont];
[[UINavigationBar appearance] setTitleTextAttributes:titleBarAttributes];

Answer 3

由于使用了iOS5，您可以像这样使用新的titleTextAttributes属性：

NSMutableDictionary *newAttributes = [[NSMutableDictionary alloc] init]; 
[newAttributes setObject:[UIFont boldSystemFontOfSize:18] forKey:UITextAttributeFont];
[self.navigationController.navigationBar setTitleTextAttributes:newAttributes];

可能的关键字包括：

UITextAttributeFont
UITextAttributeTextColor
UITextAttributeTextShadowColor
UITextAttributeTextShadowOffset