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;
    if (multiple == 0) {
        newMultiple = 1;
    }
    else if((fabs(multiple) > 0 && fabs(multiple) < 1) || (fabs(multiple)>1 && fabs(multiple)<2))
    {
        newMultiple = multiple;
    }
    else
    {
        newMultiple = 1;
    }
    CGFloat w = image.size.width*newMultiple;
    CGFloat h = image.size.height*newMultiple;
    CGFloat scale = [UIScreen mainScreen].scale;
    UIImage *tempImage = nil;
    CGRect imageFrame = CGRectMake(0, 0, w, h);
    UIGraphicsBeginImageContextWithOptions(image.size, NO, scale);
    [[UIBezierPath bezierPathWithRoundedRect:imageFrame cornerRadius:0] 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