设置导航栏标题的文字属性

效果：

源码：

UINavigationController+TitleTextAttributes.h 与 UINavigationController+TitleTextAttributes.m

////  UINavigationController+TitleTextAttributes.h//  NC////  Copyright (c) 2014年 Y.X. All rights reserved.//#import 
     
      @class NCTitleAttribute;@interface UIViewController (TitleTextAttributes)- (void)titleTextAttributes:(NCTitleAttribute *)attribute;@end
     

////  UINavigationController+TitleTextAttributes.m//  NC////  Copyright (c) 2014年 Y.X. All rights reserved.//#import "UINavigationController+TitleTextAttributes.h"#import "NCTitleAttribute.h"@implementation UIViewController (TitleTextAttributes)#pragma mark - public- (void)titleTextAttributes:(NCTitleAttribute *)attribute{    [self controller:self titleTextAttributes:[attribute transformToDictionary]];}#pragma mark - private- (void)controller:(UIViewController *)controller titleTextAttributes:(NSDictionary *)dictionary{    if ([controller isKindOfClass:[UIViewController class]])    {        [controller.navigationController.navigationBar setTitleTextAttributes:dictionary];    }}@end

NCTitleAttribute.h 与 NCTitleAttribute.m

////  NCTitleAttribute.h//  NC////  Copyright (c) 2014年 Y.X. All rights reserved.//#import 
     
      @interface NCTitleAttribute : NSObject@property (nonatomic, strong) UIColor *titleColor;   // 标题颜色@property (nonatomic, strong) UIFont  *titleFont;    // 标题字体@property (nonatomic, strong) UIColor *shadowColor;  // 阴影颜色@property (nonatomic, assign) CGSize   shadowOffset; // 阴影偏移量// 将参数转换为字典- (NSDictionary *)transformToDictionary;@end
     

////  NCTitleAttribute.m//  NC////  Copyright (c) 2014年 Y.X. All rights reserved.//#import "NCTitleAttribute.h"@implementation NCTitleAttribute- (NSDictionary *)transformToDictionary{    NSMutableDictionary *dic = [NSMutableDictionary new];        if (_titleColor)    {        [dic setObject:_titleColor forKey:NSForegroundColorAttributeName];    }    else    {        [dic setObject:[UIColor blackColor] forKey:NSForegroundColorAttributeName];    }        if (_titleFont)    {        [dic setObject:_titleFont forKey:NSFontAttributeName];    }        if (_shadowOffset.height || _shadowOffset.width)    {                NSShadow *shadow = [NSShadow new];                shadow.shadowColor  = _shadowColor;        shadow.shadowOffset = _shadowOffset;                [dic setObject:shadow forKey:NSShadowAttributeName];    }        return dic;}@end

使用的源码：

////  RootViewController.m//  NC////  Copyright (c) 2014年 Y.X. All rights reserved.//#import "RootViewController.h"#import "UINavigationController+TitleTextAttributes.h"#import "NCTitleAttribute.h"#import "FontPool.h"@interface RootViewController ()@end@implementation RootViewController- (void)viewDidLoad{    [super viewDidLoad];    self.view.backgroundColor = [UIColor blackColor];        [FontPool registerFont:bundleFont(@"华康少女字体.ttf")                  withName:@"华康少女字体"];        // 设置导航栏标题    self.title = @"YouXianMing";    NCTitleAttribute *titleAttribute = [NCTitleAttribute new];    titleAttribute.titleColor        = [UIColor redColor];    titleAttribute.titleFont         = [UIFont fontWithName:CUSTOM_FONT(@"华康少女字体", 0) size:20.f];    titleAttribute.shadowColor       = [UIColor blackColor];    titleAttribute.shadowOffset      = CGSizeMake(1, 1);        [self titleTextAttributes:titleAttribute];}@end

简单的分析：

其实，核心的方法就一个而已

然后，将那个字典抽象成了对象，将复杂的设置转换成了简单的对象来理解

然后，使用的时候是通过category来实现

一个这么简单的功能为何要这么折腾？其实这就是提高效率的方案，将重复代码抽象成类，你不用再去关注复制粘贴代码，还不懂细节的含义，而是你可以见名知意一目了然而已。