iOS上的键路径字符串生成器
@"sometimes.you.want.query.value.from.dictionary"
@interface KPMaker (QueryKeyPath)
@property (readonly) KPMaker *sometimes;
-(KPMaker*) you;
-(KPMaker*) want;
...
-(KPMaker*) dictionary;
@end
NSString *keyPath = KeyPath(sometimes.you.want.query.value.from.dictionary);
支持任何类的所有属性