app 换肤
关于app换肤的几种方式
本地换肤
本地换肤，是通过包里面自身已经拥有的图片和颜色配置，对视图以及各控件切换主题色。
优点是工作量相对较少，不需要后台人员配合。
缺点是局限性比较大，必须通过发包的形式才能更新最新的皮肤颜色，也不能根据节日更换app主题。
远程换肤
远程换肤，是通过后台配置的方式，下载新的皮肤对app重新布局。也可以在app当天的第一次启动时，发送请求给后台，通过后台的服务器时间，缓存最新的节日皮肤。并在节日当天换上最新的皮肤。
优点是可以灵活配置各种皮肤，并且也不会占用太多的安装包大小。
缺点是工作量大，耗时长，需要后台人员配合。
换肤方案
app换肤，有多种途径实现换肤的效果，以下所叙的是通过runtime给UIView添加一个属性字典，在属性字典中设置可变皮肤的特性。再采用通知的方式，让每个控件去刷新自身，并且由自身控制生命周期。从而实现本地换肤的效果，并且兼容后续添加远程换肤。
首先设置存取皮肤主题的plist文件，默认添加几个皮肤方案。再新建一个类控制皮肤切换时更改颜色和图片
+ (UIImage *)setSkinImageWithStr:(NSString *)str
{
// 获取plist里面的数据
NSDictionary * dict = [NSString getDicWithKey:@"Skin.plist"];
if ([dict.allKeys containsObject:@"selectColor"])
{
NSString * key = [dict objectForKey:@"selectColor"];
return [UIImage imageNamed:[NSString stringWithFormat:@"%@_%@", str, key]];
}
return nil;
}
+ (UIColor *)setSkinColorWithStr:(NSString *)str
{
NSDictionary * dict = [NSString getDicWithKey:@"Skin.plist"];
if ([dict.allKeys containsObject:@"selectColor"])
{
NSString * key = [dict objectForKey:@"selectColor"];
NSDictionary * dic = [dict objectForKey:key];
NSString * colorStr = [dic objectForKey:@"color"];
return [UIColor sam_colorWithHex:colorStr];
}
return [UIColor clearColor];
}
给UIView和UITabbarItem添加类别，利用runtime添加themeMap的属性
static void *kUIView_ThemeMap;
static void *kUIView_DeallocHelper;
@implementation UITabBarItem (UIConfig)
- (void)setThemeMap:(NSDictionary *)themeMap
{
objc_setAssociatedObject(self, &kUIView_ThemeMap, themeMap, OBJC_ASSOCIATION_COPY_NONATOMIC);
if (themeMap) {
@autoreleasepool {
// Need to removeObserver in dealloc
if (objc_getAssociatedObject(self, &kUIView_DeallocHelper) == nil) {
__unsafe_unretained typeof(self) weakSelf = self; // NOTE: need to be __unsafe_unretained because __weak var will be reset to nil in dealloc
id deallocHelper = [self addDeallocBlock:^{
NSLog(@"deallocing %@", weakSelf);
[[NSNotificationCenter defaultCenter] removeObserver:weakSelf];
}];
objc_setAssociatedObject(self, &kUIView_DeallocHelper, deallocHelper, OBJC_ASSOCIATION_ASSIGN);
}
[[NSNotificationCenter defaultCenter] removeObserver:self name:kThemeDidChangeNotification object:nil];
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(themeChanged) name:kThemeDidChangeNotification object:nil];
[self themeChanged];
}
}
else {
[[NSNotificationCenter defaultCenter] removeObserver:self name:kThemeDidChangeNotification object:nil];
}
}
- (NSDictionary *)themeMap
{
return objc_getAssociatedObject(self, &kUIView_ThemeMap);
}
添加key值对应UItabbarItem的选中颜色，未选中颜色，选中图片，未选中图片
/**
* 设置图片
*/
NSString *kTabBarItemKeyImageName = @"kTabBarItemKeyImageName";
/**
* 设置选中图片
*/
NSString *kTabBarItemKeySelectedImageName = @"kTabBarItemKeySelectedImageName";
/**
* 设置文字颜色
*/
NSString *kTabBarItemKeyColorName = @"kTabBarItemKeyColorName";
/**
* 设置选中文字颜色
*/
NSString *kTabBarItemKeySelectedColorName = @"kTabBarItemKeySelectedColorName";
通知监听的方法
#define TColor(name) [ChangeSkinManager setSkinColorWithStr:name]
#define TImage(name) [ChangeSkinManager setSkinImageWithStr:name]
- (void)themeChanged
{
// TODO: performace tuning
dispatch_async(dispatch_get_main_queue(), ^{
[self changeTheme];
});
}
- (void)changeTheme
{
NSDictionary *map = self.themeMap;
if (map[kTabBarItemKeyImageName])
{
self.image = TImage(map[kTabBarItemKeyImageName]);
}
if (map[kTabBarItemKeySelectedImageName])
{
self.selectedImage = TImage(map[kTabBarItemKeySelectedImageName]);
}
if (map[kTabBarItemKeyColorName])
{
[self setTitleTextAttributes:[NSMutableDictionary dictionaryWithObjectsAndKeys:TColor(map[kTabBarItemKeyColorName]) ,NSForegroundColorAttributeName, nil] forState:UIControlStateNormal];
}
if (map[kTabBarItemKeySelectedColorName])
{
[self setTitleTextAttributes:[NSMutableDictionary dictionaryWithObjectsAndKeys:TColor(map[kTabBarItemKeySelectedColorName]) ,NSForegroundColorAttributeName, nil] forState:UIControlStateSelected];
}
}
在AppDelegate设置tabbar的时候
OneViewController * oneVC = [[OneViewController alloc] init];
UINavigationController * oneNav = [[UINavigationController alloc] initWithRootViewController:oneVC];
oneNav.tabBarItem.title = @"第一页";
[oneNav.tabBarItem setTitlePositionAdjustment:UIOffsetMake(0, -3)];
// @""里面设置plist文件里面自定义的key
oneNav.tabBarItem.themeMap = @{
kTabBarItemKeyColorName:@"",
kTabBarItemKeySelectedColorName:[ChangeSkinManager setSkinColorWithStr:@""]
};
最后在更换主题时，发送通知就可以了
- (void)changeSkin:(UIButton *)button
{
NSString *cachesPath = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES)lastObject] ;
NSString *infoFilePath = [cachesPath stringByAppendingPathComponent:@"Skin.plist"];
NSDictionary * dic = [NSString getDicWithKey:@"Skin.plist"];
[dic setValue:@"red" forKey:@"selectColor"];
[dic writeToFile:infoFilePath atomically:YES];
[[NSNotificationCenter defaultCenter] postNotificationName:kThemeDidChangeNotification object:nil];
}
总结
如需要实现远程换肤，还需要添加后台支持，下载之后添加到plist文件，再切换。
demo地址：https://github.com/LKY7748/ChangeSkinDemo
参考资料：https://github.com/yanjunz/ThemeManager
把工程重新整理了一遍，可以下载查看了。。。
