观察者模式

通知   

KVO(Key-Value Observing)

NSString *value = [NSStringstringWithFormat:@"%d",(int)_mySlider.value];

NSLog(@"%@",[selfvalueForKeyPath:@"myTxt.text"]);

NSString *keyPath = @"myTxts.text";

[self setValue:value forKeyPath:keyPath];

 

 

KVC(Key-Value Coding)

 

===========1:

//加一个检测textFiled的

 

    [self addObserver:selfforKeyPath:@"myTxt.text"options:

     NSKeyValueObservingOptionOld||NSKeyValueObservingOptionNewcontext:nil];

===========2:

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

{

    NSLog(@"1");

    NSLog(@"%@",change);

}

 

适配器模式

协议