iOS 使用系统的UITabBarController 修改展示的图片大小

1. 设置TabBarItem图片的大小

 1 - (void)configurationAppTabBarAndNavigationBar
 {
     // 选中的item普通状态图片的大小
     UIImage *normalImage = self.navigationController.tabBarController.tabBar.selectedItem.image;
     UIImage *tabNormalImage = [ToolObject createNewImageWithColor:normalImage multiple:1.1];
     tabNormalImage = [tabNormalImage imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal];
     [self.navigationController.tabBarController.tabBar.selectedItem setImage:tabNormalImage];
     // 选中的item选中撞他图片的大小
     UIImage *selectImage = self.navigationController.tabBarController.tabBar.selectedItem.selectedImage;
     UIImage *tabSelectImage = [self createNewImageWithColor:selectImage multiple:1.1];
     tabSelectImage = [tabSelectImage imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal];12　　　// 设置点击图片放大缩小的动画
     [self.navigationController.tabBarController.tabBar.selectedItem setSelectedImage:tabSelectImage];
     self.navigationController.tabBarController.tabBar.tintColor = [UIColor colorWithRed:0.11f green:0.61f blue:0.97f alpha:1.00f];
     self.navigationController.tabBarController.tabBar.barTintColor = [UIColor colorWithRed:0.85f green:0.85f blue:0.85f alpha:1.00f];
 }

2.图片放大或压缩处理 ，图片放大倍数 0 ~ 2 之间 ，0~1 缩小图片，1~2 放大图片 

 1 /**
  *  根据image 返回放大或缩小之后的图片
  *
  *  @param image    原始图片
  *  @param multiple 放大倍数 0 ~ 2 之间
  *
  *  @return 新的image
  */
 + (UIImage *) createNewImageWithColor:(UIImage *)image multiple:(CGFloat)multiple
 {
     CGFloat newMultiple = multiple;
     ) {
         newMultiple = ;
     }
      && fabs(multiple) < ) || (fabs(multiple)> && fabs(multiple)<))
     {
         newMultiple = multiple;
     }
     else
     {
         newMultiple = ;
     }
     CGFloat w = image.size.width*newMultiple;
     CGFloat h = image.size.height*newMultiple;
     CGFloat scale = [UIScreen mainScreen].scale;
     UIImage *tempImage = nil;
     CGRect imageFrame = CGRectMake(, , w, h);
     UIGraphicsBeginImageContextWithOptions(image.size, NO, scale);
     [[UIBezierPath bezierPathWithRoundedRect:imageFrame cornerRadius:] addClip];
     [image drawInRect:imageFrame];
     tempImage = UIGraphicsGetImageFromCurrentImageContext();
     UIGraphicsEndImageContext();
     return tempImage;
 }

这样就可以修改选中状态和普通状态下的TabBarItem 图片的大小 ，是不是很简单呢，不足之处，还请大家多多指教