iOS开发之观察者

//观察者事件 (!!注册必删除)

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

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

//删除注册的观察者事件

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

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

//观察者触发的事件，在观察者观察到变化的时候触发

-(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(@"触发MoreModel观察者~!");

}

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

NSLog(@"触发BuyModel观察者~!");

[self
requestBeforeBuy];

}

}

再次强调，观察者添加必有删除，如果忘记删除，会导致意想不到的麻烦。

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