iOS tabbar文字与图片间距

- (void)addOneChildViewController:(UIViewController*)viewController

                        WithTitle:(NSString*)title

                  normalImageName:(NSString*)normalImageName

                selectedImageName:(NSString*)selectedImageName {

viewController.tabBarItem.title= title;

[viewController.tabBarItem setTitleTextAttributes:dict forState:UIControlStateNormal];

viewController.tabBarItem.titlePositionAdjustment = UIOffsetMake(0, 5);

 viewController.tabBarItem.imageInsets=UIEdgeInsetsMake(-1,0,1,0);

}