iOS開發之觀察者

//觀察者事件  (!!註冊必刪除)

[[IndexViewInformation sharedInstance] addObserver:self forKeyPath:@"selectedMoreModel" options:NSKeyValueObservingOptionNew | NSKeyValueObservingOptionOld context:nil];

    

    [[IndexViewInformation sharedInstance] addObserver:self forKeyPath:@"selectedBuyModel" options:NSKeyValueObservingOptionNew | NSKeyValueObservingOptionOld context:nil];

//刪除註冊的觀察者事件

[[IndexViewInformation sharedInstance] removeObserver:self forKeyPath:@"selectedBuyModel"];

[[IndexViewInformation sharedInstance] removeObserver:self forKeyPath:@"selectedMoreModel"];

//觀察者觸發的事件，在觀察者觀察到變化的時候觸發

-(void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context {

    

    if ([keyPath isEqualToString:@"selectedMoreModel"]) {

        UIStoryboard *board=[UIStoryboard storyboardWithName:@"Main" bundle:nil];

        ProjectDetailViewController *pro =[board instantiateViewControllerWithIdentifier:@"ProjectDetail"];

        

        pro.shengyuTime = [IndexViewInformation sharedInstance].selectedMoreModel.thenDays;

        pro.projectID = [IndexViewInformation sharedInstance].selectedMoreModel.prodectId;

        pro.thenDays = pro.shengyuTime;

        [self.navigationController pushViewController:pro animated:YES];

        NSLog(@"觸發MoreModel觀察者~!");

        

    }

    

    if ([keyPath isEqualToString:@"selectedBuyModel"]) {

        

        NSLog(@"觸發BuyModel觀察者~!");

        

        [self requestBeforeBuy];

        

        

    }

    

}

再次強調，觀察者添加必有刪除，如果忘記刪除，會導致意想不到的麻煩。

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