修改pageController的图片

- (void) setBotPageControllerImage {     NSArray *subView = pagecontrol.subviews;     for (int i =0; i < [subView count]; i++)     {         UIImageView *dot = [subView objectAtIndex:i];         dot.image = (pagecontrol.currentPage == i ?[UIImage selfimageNamed:@"[email protected]"]:[UIImage selfimageNamed:@"[email protected]"]);         dot=nil;     }     subView=nil; }