swift -观察数组

classKnowViewModel:NSObject{

//被观察的属性必须用dynamic修饰

dynamicvardataSourceForKnowViewModel : [KnowModel]! = []//数组

}

//懒加载创建数组

/* 1.

lazy var dataArray : NSArray = {

return NSArray()

}()

*/

//2.

lazyvardataSource :Array = {

vartmpArray :Array! = []//初始化

returntmpArray

}()

classKnowHuViewController:UIViewController,UITableViewDataSource,UITableViewDelegate{

//3.MARK:定义属性viewModel一定要var,并没有初始化

varknowViewModle :KnowViewModel!

overridefuncviewDidLoad() {

super.viewDidLoad()

// Do any additional setup after loading the view.

self.title="知乎MVVM"

//初始化控件

configurationKnowHuView()

//3.初始化knowViewModle

knowViewModle=KnowViewModel.init()

//添加观察者,写在初始化后面

knowViewModle.addObserver(self, forKeyPath:"dataSourceForKnowViewModel", options: .New, context:nil)

knowViewModle.getDailyThemesDataWithThemeID(10)

}

//MARK:实现观察者方法

overridefuncobserveValueForKeyPath(keyPath:String?, ofObject object:AnyObject?, change: [String:AnyObject]?, context:UnsafeMutablePointer) {

ifkeyPath =="dataSourceForKnowViewModel"{

//将viewModle里面的数据赋给dataSource

self.dataSource=knowViewModle.dataSourceForKnowViewModel

self.tableView.reloadData()

}

}

//MARK:移除观察者

deinit{

knowViewModle.removeObserver(self, forKeyPath:"dataSourceForKnowViewModel")

}

}