iphone - Add Observer to BOOL variable -

is possible add observers simple variables such bools or nsintegers , see when change?

thanks!

you observe keys notified when value changes. data type can anything. defined objective-c property (with @property in .h file) ready go if want observe bool property add view controller follows:

in myviewcontroller.h:

@interface myviewcontroller : uiviewcontroller {     bool      mysetting; }  @property (nonatomic)    bool    mysetting; 

in myviewcontroller.m

@implementation myviewcontroller  @synthesize mysetting;  // rest of myviewcontroller implementation  @end 

in otherviewcontroller.m:

// assumes myvc defined property of otherviewcontroller  - (void)presentmyviewcontroller {     self.myvc = [[[myviewcontroller alloc] init] autorelease];     // note: remove self observer before myvc released/dealloced     [self.myvc addobserver:self forkeypath:@"mysetting" options:0 context:nil];     // present myvc modally or navigation controller here }  - (void)observevalueforkeypath:(nsstring *)keypath ofobject:(id)object change:(nsdictionary *)change context:(void *)context {     if (object == self.myvc && [keypath isequaltostring:@"mysetting"]) {         nslog(@"othervc: value of self.myvc.mysetting has changed");     } }