@interface TimerWeakObject : NSObject
@property (nonatomic, weak) id target; @property (nonatomic, assign) SEL selector; @property (nonatomic, weak) NSTimer *timer;
- (void)fire:(NSTimer *)timer; @end
@implementation TimerWeakObject
- (void)fire:(NSTimer *)timer { if (self.target) { if ([self.target respondsToSelector:self.selector]) { [self.target performSelector:self.selector withObject:timer.userInfo]; } } else{ [self.timer invalidate]; } }
@end
@implementation NSTimer (WeakTimer)
-
(NSTimer *)scheduledWeakTimerWithTimeInterval:(NSTimeInterval)interval target:(id)aTarget selector:(SEL)aSelector userInfo:(id)userInfo repeats:(BOOL)repeats { TimerWeakObject *object = [[TimerWeakObject alloc] init]; object.target = aTarget; object.selector = aSelector; object.timer = [NSTimer scheduledTimerWithTimeInterval:interval target:object selector:@selector(fire:) userInfo:userInfo repeats:repeats];
return object.timer; }