在ios开发中要实现好像新浪微博那样转换主题，理论上要通过3种模式，基本思路如下：
1.创建一个单例的主题管理器：ThemeManager类
2.单例模式里面的，全局共享方法
+(ThemeManager*)shareInstance { static ThemeManager*themeManager; static dispatch_once_t onceToken; dispatch_once(&onceToken, ^{ themeManager = [[self alloc] init]; }); return themeManager; }
-(id)init { self=[super init]; if (self) { //获取根目录的路径 NSString*path=[[NSBundle mainBundle]pathForResource:@"theme" ofType:@"plist"]; self.themePlist=[NSDictionary dictionaryWithContentsOfFile:path]; self.themeName=nil; } return self; }
初始化方法解析一下
加载一个主题的目录：
NSString*path=[[NSBundle mainBundle]pathForResource:@"theme" ofType:@"plist"];
PS：那个.plist文件包含了主题路劲的设定:比如
蓝色主题：就有对应主题路径：Skin/bule
粉红色主题，就有Skin/pink
在这两个路径都包含了两个主题所拥有的所以图片，而且每个图片名字是相同的，只是路径不一样
3.跟着在类里面定义属性跟方法
@property(copy,nonatomic)NSString*themeName; //主题具体路径，会重写setting方法 @property(strong,nonatomic)NSDictionary*themePlist; //包含主题的名字，具体的路径，跟上图一样 @property(strong,nonatomic)NSDictionary *fontColorPlist; //包含颜色的名字，跟路径 //单例 +(ThemeManager*)shareInstance; //根据对应的相片名，返回正确主题下的照片 -(UIImage*)getThemeImage:(NSString*)imageName; //RGB字符串 -(UIColor*)getThemeFontColor:(NSString*)colorName;
4,一个私用方法：-(NSString*)getThemePath //来获取具体主题路径
-(NSString*)getThemePath { //如果默认就选择根目录的图片 if (self.themeName==nil) { NSString *resourcePath = [[NSBundle mainBundle] resourcePath]; return resourcePath; //根目录都长这样 } NSString*name=[_themePlist valueForKey:_themeName]; NSString*resourcePath=[[NSBundle mainBundle]resourcePath]; // NSURL*url=[NSBundle mainBundle]URLForResource:<#(NSString *)#> withExtension:<#(NSString *)#> NSString*themePath=[resourcePath stringByAppendingString:name]; return themePath; }
5,- (UIImage *)getThemeImage:(NSString *)imageName
这个方法来根据使用者所输入的名字来返回正确主题下图片
用法:UIImage*newImage=[ThemeManager shardInstance]getThemeImage:@"NavigationBarImg"] //返回对应导航栏的图片，就那么简单
//返回当前主题下的图片 - (UIImage *)getThemeImage:(NSString *)imageName { if (imageName.length == 0) { return nil; } //获取主题目录 NSString *themePath = [self getThemePath]; //imageName在当前主题的路径 NSString *imagePath = [themePath stringByAppendingPathComponent:imageName]; UIImage *image = [UIImage imageWithContentsOfFile:imagePath]; return image; }
下面，离开这个管理类
1.我们需要改变主题的UI元素一般是UIButton,UILabel
2.所以创建一个UIButton的子类
3.然后在子类设置通知机制来接受通知，即系当通知中心的值改变了，就相应地调用子类下接受通知的方法
-(id)init { self=[super init]; if (self) { [[NSNotificationCenter defaultCenter]addObserver:self selector:@selector(themeNotification:) name:kThemeDidChangeNofication object:nil]; } return self; }
#pragma mark - NSNotification action //切换主题的通知 - (void)themeNotification:(NSNotification *)notification { [self loadThemeImage]; }
[self loadThemeImage]这个方法会重新刷新所有图片，下面有定义
4.定义基本属性跟初始化方法
//Normal状态下的图片名称 @property(nonatomic,copy)NSString *imageName; //高亮状态下的图片名称 @property(nonatomic,copy)NSString *highligtImageName; //Normal状态下的背景图片名称 @property(nonatomic,copy)NSString *backgroundImageName; //高亮状态下的背景图片名称 @property(nonatomic,copy)NSString *backgroundHighligtImageName; - (id)initWithImage:(NSString *)imageName highlighted:(NSString *)highligtImageName; - (id)initWithBackground:(NSString *)backgroundImageName highlightedBackground:(NSString *)backgroundHighligtImageName;
5.重写setting方法、必须的
会发现，里面有个 [self loadThemeImage];，这个是加载相应路径的图片
#pragma mark - setter 设置图片名后，重新加载该图片名对应的图片 - (void)setImageName:(NSString *)imageName { if (_imageName != imageName) { _imageName = imageName; } //重新加载图片 [self loadThemeImage]; } - (void)setHighligtImageName:(NSString *)highligtImageName { if (_highligtImageName != highligtImageName) { _highligtImageName = highligtImageName; } //重新加载图片 [self loadThemeImage]; } - (void)setBackgroundImageName:(NSString *)backgroundImageName { if (_backgroundImageName != backgroundImageName) { _backgroundImageName = [backgroundImageName copy]; } //重新加载图片 [self loadThemeImage]; } - (void)setBackgroundHighligtImageName:(NSString *)backgroundHighligtImageName { if (_backgroundHighligtImageName != backgroundHighligtImageName) { _backgroundHighligtImageName = [backgroundHighligtImageName copy]; } //重新加载图片 [self loadThemeImage]; }
6，加载图片方法
-(void)loadThemeImage { ThemeManager*themeManager=[ThemeManager shareInstance]; UIImage *image = [themeManager getThemeImage:_imageName]; UIImage *highligtImage = [themeManager getThemeImage:_highligtImageName]; [self setImage:image forState:UIControlStateNormal]; [self setImage:highligtImage forState:UIControlStateHighlighted]; UIImage *backImage = [themeManager getThemeImage:_backgroundImageName]; UIImage *backHighligtImage = [themeManager getThemeImage:_backgroundHighligtImageName]; [self setBackgroundImage:backImage forState:UIControlStateNormal]; [self setBackgroundImage:backHighligtImage forState:UIControlStateHighlighted];//4个重置 }
7，初始化方法重写
-(id)initWithImage:(NSString *)imageName highlighted:(NSString *)highligtImageName { self=[self init]; if (self) { self.imageName=imageName; self.highligtImageName=highligtImageName; } return self; } -(id)initWithBackground:(NSString *)backgroundImageName highlightedBackground:(NSString *)backgroundHighligtImageName { self = [self init]; if (self) { self.backgroundImageName = backgroundImageName; self.backgroundHighligtImageName = backgroundHighligtImageName; } return self; }
// self.backgroundImageName = backgroundImageName;,这些引用方法会调用setting
8，用法
ThemeButton *newButton=[ThemeButton alloc]initWithBackground:(NSString *)backgroundImageName highlightedBackground:(NSString *)backgroundHighligtImageName
背景图，高亮图是具体名字
ios开发教程，从主题管理中学会用基本的通知模式，单例模式跟工厂模式
原文：http://www.cnblogs.com/MrIOS/p/3553605.html