OC-观察者练习练习

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main.h    //被观察的对象    Jones *joens = [[Jones alloc] initWithJones];        //观察的对象    Lucy *lucy = [[Lucy alloc] initWithLucy:joens];        [[NSRunLoop currentRunLoop] run];@interface Jones : NSObject@property(nonatomic,assign) int happy;-(instancetype)initWithJones;//高兴值增加-(void)happyIncrement;————————————————————————————————@implementation Jones//高兴值-(void)happyIncrement{    //通过KVC才能触发KVO        NSNumber *number = [NSNumber numberWithInt:++_happy];    //[self setHappy:++_happy];        [self setValue:number forKey:@"happy"];        //[self setHappy:12]        NSLog(@"%d",self->_happy);};-(instancetype)initWithJones{    if(self = [super init])    {        [NSTimer scheduledTimerWithTimeInterval:1 target:self selector:@selector(happyIncrement) userInfo:nil repeats:YES];    }    return self;}@implementation Jones//高兴值-(void)happyIncrement{    //通过KVC才能触发KVO        NSNumber *number = [NSNumber numberWithInt:++_happy];    //[self setHappy:++_happy];        [self setValue:number forKey:@"happy"];        //[self setHappy:12]        NSLog(@"%d",self->_happy);};-(instancetype)initWithJones{    if(self = [super init])    {        [NSTimer scheduledTimerWithTimeInterval:1 target:self selector:@selector(happyIncrement) userInfo:nil repeats:YES];    }    return self;}@implementation Lucy-(instancetype)initWithLucy:(Jones *)jones{    if (self = [super init])    {        //当Jones传入进来 我们就对他观察                self->_jones = jones;                self->_jones.happy = 0;                //添加观察者模式        /*            参数介绍 1,观察那个对象 2,观察那个属性 3,新值,和旧值 4,可以随便给                 */        [_jones addObserver:self forKeyPath:@"happy" options:NSKeyValueObservingOptionOld|NSKeyValueObservingOptionNew context:nil];    };    return self;}//如果被观察者的对象属性被改变这个对象就回被触发!-(void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context{    /**        1.参数介绍            1.keyPath 那个属性            2.object  那个对象            3.change  属性大全    **/        //如果被监听属性加到10了 移除被观察的对象    if ([[change objectForKey:@"new"] intValue] == 10)    {        //移除观察者对象           [_jones removeObserver:self forKeyPath:@"happy"];    }        //否则打赢属性    NSLog(@"观察者调用了->%@",[change objectForKey:@"new"]);    };
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