iOS控件---UI适配器切换主题

Demo

一、需求：

1、一键切换APP的主题

二、思路：

主题所包含的内容有：字体、字体大小、颜色、图片，所以需要在切换主题的时候主要把这些东西都换掉

1、把不同的主题用文件夹装起来，所以需要解决路径问题
2、字体、字体大小、颜色用一个plist进行设置，放在主题文件夹里
3、每个主题文件夹的图片名字一样，只需要改变路径就可以改变图片
4、把页面的需要随主题改变的字体、字体大小、颜色、图片的设置放到block中，然后调用block到达切换主题的目的
5、用一个单例管理来管理主题的配置

三、Code：

1、默认主题和不同主题的对应路径

//主题对应的路径
- (NSString *)topicPath:(NSString *)name
{
    if ([self.topicName isEqualToString:WXHUIAdapterTopicNameDefault]) {
        NSString *bundlePath = [[NSBundle mainBundle] bundlePath];
        bundlePath = [bundlePath stringByAppendingPathComponent:name];
        return bundlePath;
    } else {
        NSString *documentPath = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0];
        documentPath = [documentPath stringByAppendingPathComponent:WXHUIAdapterTopicManager];
        documentPath = [documentPath stringByAppendingPathComponent:self.topicName];
        documentPath = [documentPath stringByAppendingPathComponent:name];
        return documentPath;
    }
}

2、根据不同主题获取对应的内容

//字体、字体大小、颜色的配置信息
- (void)loadTopicData
{
    NSString *infoPlistPath = [self topicPath:WXHUIAdapterTopicInfoPlist];
    NSDictionary *dic = [NSDictionary dictionaryWithContentsOfFile:infoPlistPath];
    
    self.sizeDic = dic[@"size"];
    self.fontDic = dic[@"font"];
    self.colorDic = dic[@"color"];
}
//字体大小
+ (CGFloat)topicSize:(NSString *)fontName
{
    WXHUIAdapter *sharedWXHUIAdapter = [WXHUIAdapter sharedWXHUIAdapter];
    NSString *size = sharedWXHUIAdapter.sizeDic[fontName];
    return size.floatValue;
}
//字体
+ (UIFont *)topicFont:(NSString *)fontName
{
    WXHUIAdapter *sharedWXHUIAdapter = [WXHUIAdapter sharedWXHUIAdapter];
    
    NSString *name = sharedWXHUIAdapter.fontDic[fontName];
    CGFloat size = [self topicSize:fontName];
    
    if (fontName) {
        return [UIFont fontWithName:name size:size];
    } else {
        return [UIFont systemFontOfSize:size];
    }
}
//颜色
+ (UIColor *)topicColor:(NSString *)colorName
{
    WXHUIAdapter *sharedWXHUIAdapter = [WXHUIAdapter sharedWXHUIAdapter];
    NSString *color = sharedWXHUIAdapter.colorDic[colorName];
    return [UIColor colorWithHexString:color];
}
//16进制颜色
+ (NSString *)topicColorString:(NSString *)colorName
{
    WXHUIAdapter *sharedWXHUIAdapter = [WXHUIAdapter sharedWXHUIAdapter];
    NSString *color = sharedWXHUIAdapter.colorDic[colorName];
    
    if (color) {
        return color;
    } else {
        return @"#FFFFFF";
    }
}
//图片
+ (UIImage *)topicImage:(NSString *)imageName
{
    WXHUIAdapter *sharedWXHUIAdapter = [WXHUIAdapter sharedWXHUIAdapter];
    if ([sharedWXHUIAdapter.topicName isEqualToString:WXHUIAdapterTopicNameDefault]) {
        return [UIImage imageNamed:imageName];
    } else {
        NSString *imagePath = [sharedWXHUIAdapter topicPath:imageName];
        return [UIImage imageWithContentsOfFile:imagePath];
    }
}

3、注册/删除一个主题改变时调用的block

//注册一个主题改变时调用的block
+ (void)registTopicDidChange:(TopicDidChangeBlock)topicDidChangeBlock forKey:(NSString *)key
{
    if (key) {
        WXHUIAdapter *sharedWXHUIAdapter = [WXHUIAdapter sharedWXHUIAdapter];
        if (topicDidChangeBlock) {
            WXHUIAdapterChangeBlockInfo *blockInfo = [[WXHUIAdapterChangeBlockInfo alloc] init];
            blockInfo.topicDidChangeBlock = topicDidChangeBlock;
            blockInfo.key = key;
            [sharedWXHUIAdapter.changeBlockDic setObject:blockInfo forKey:key];
            
            topicDidChangeBlock(sharedWXHUIAdapter.topicName);
        } else {
            [sharedWXHUIAdapter.changeBlockDic removeObjectForKey:key];
        }
    }
}
//删除已经注册的block
+ (void)removeTopicDidChangeForKey:(NSString *)key
{
    if (key) {
        WXHUIAdapter *sharedWXHUIAdapter = [WXHUIAdapter sharedWXHUIAdapter];
        [sharedWXHUIAdapter.changeBlockDic removeObjectForKey:key];
    }
}

4、切换主题

//设置主题
+ (void)setTopic:(NSString *)topicName
{
    WXHUIAdapter *sharedWXHUIAdapter = [WXHUIAdapter sharedWXHUIAdapter];
    sharedWXHUIAdapter.topicName = topicName;
}
- (void)setTopicName:(NSString *)topicName
{
    if (_topicName != topicName) {
        _topicName = topicName;
        
        [[NSUserDefaults standardUserDefaults] setObject:topicName forKey:WXHUIAdapterTopicName];
        [[NSUserDefaults standardUserDefaults] synchronize];
        
        [sharedWXHUIAdapter loadTopicData];
        NSArray *array = [sharedWXHUIAdapter.changeBlockDic allValues];
        for (WXHUIAdapterChangeBlockInfo *blockInfo in array) {
            blockInfo.topicDidChangeBlock(sharedWXHUIAdapter.topicName);
        }
    }
}

总结：

1、实现的方式比较简单，图片除了默认的主题会有缓存，其他的主题的图片都没做缓存，可以按实际需求添加。
2、每一个主题都需要把所有的对应数据都保存一次，如果找不到数据就默认置空了。
3、对应单个页面的字体、字体大小的改变，如web页面的字体、聊天的字体设置，不属于主题的部分最好单独管理