改变UITabBarController的颜色

UIView*mView=[[UIView alloc]initWithFrame:CGRectMake(0,0,320,48)];//这是部分tabbar的颜色

[mView setBackgroundColor:[UIColor colorWithPatternImage:[UIImage imageNamed:@"ydy1.jpg"]]];

[self.tabBar insertSubview:mView atIndex:1];

mView.alpha=0.8;

效果如图：

设置tabBar的背景色

第一种方式：

[[UITabBar appearance] setBackgroundColor:[UIColor redColor]];//测试时不起作用

[[UITabBar appearance] setBarTintColor:[UIColor redColor]];//这样写才能达到效果。

如果想要得到想要的颜色需要再另外添加一句：

[UITabBar appearance].translucent = NO;// 这句表示取消tabBar的透明效果。

第二种方式：在tabBar上添加一个有颜色的View

UIView *view= [[UIView alloc]init];

view.backgroundColor=[UIColor redColor];

view.frame=self.tabBar.bounds;

[[UITabBar appearance] insertSubview:view atIndex:0];

第三种方式：使用背景图片：

[[UITabBar appearance] setBackgroundImage:[UIImage imageNamed:@"tabBarBackgroundImage"]];

[UITabBar appearance].translucent = NO;

UITabBarItem的文字样式（颜色和大小）

#define WYColor(r, g, b) [UIColor colorWithRed:(r)/255.0 green:(g)/255.0 blue:(b)/255.0 alpha:1.0]

// 第一种写法

NSMutableDictionary *textAttrs = [NSMutableDictionary dictionary];

textAttrs[NSForegroundColorAttributeName] = WYColor(123, 123, 123);

textAttrs[NSFontAttributeName]=[UIFont fontWithName:@"Helvetica" size:12.0f];

NSMutableDictionary *selectTextAttrs = [NSMutableDictionary dictionary];

selectTextAttrs[NSForegroundColorAttributeName] = WYColor(50, 156, 245);

selectTextAttrs[NSFontAttributeName]=[UIFont fontWithName:@"Helvetica" size:18.0f];

[[UITabBarItem appearance] setTitleTextAttributes:textAttrs forState:UIControlStateNormal];

[[UITabBarItem appearance] setTitleTextAttributes:selectTextAttrs forState:UIControlStateSelected];

// 第二种写法

[[UITabBarItem appearance] setTitleTextAttributes:[NSDictionary dictionaryWithObjectsAndKeys:[UIColor blackColor], NSForegroundColorAttributeName, [UIFont fontWithName:@"Helvetica" size:12.0f],NSFontAttributeName,nil] forState:UIControlStateNormal];

[[UITabBarItem appearance] setTitleTextAttributes:[NSDictionary dictionaryWithObjectsAndKeys:[UIColor redColor], NSForegroundColorAttributeName, [UIFont fontWithName:@"Helvetica" size:19.0f],NSFontAttributeName,nil] forState:UIControlStateSelected];

注意：1、设置字体的时候要选择支持中文的字体，不然的话修改字号是无效的，比如字体设置成“ProximaNova-Semibold”。这种字体本身只支持英语，不支持中文，所以使用该字体并不能调整字体大小。

2、如果文字太大的话，会和图片靠的很近，这个时候我们可以让UI设计师给我们切图的时候多留一点边白就可以解决。

UITabBarItem的选中和非选中图片

UINavigationController *nav = [[UINavigationController alloc] initWithRootViewController:[[ViewController alloc] init]];

nav.tabBarItem.image =[[UIImage imageNamed:@"unselect"] imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal];

nav.tabBarItem.selectedImage =[[UIImage imageNamed:@"select"] imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal];

nav.tabBarItem.title = @"yoowei";

[self addChildViewController:nav];

调整各个ITEM的位置

//未选中的图片（上面的数组没有列出）

UIImage *unselectedImage = [UIImage imageNamed:nor_images[i]];

unselectedImage = [unselectedImage imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal];

//选中的图片

UIImage *selectedImage = [UIImage imageNamed:select_images[i]];

selectedImage = [selectedImage imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal];

UITabBarItem *tabBarItem = [[UITabBarItem alloc] initWithTitle:arrayName[i] image:unselectedImage selectedImage:selectedImage];

//设置背景图片的内凹变化，正值向内缩小，负值向外延伸

UIEdgeInsets insets;

insets.left = -5;

insets.right = -5;

tabBarItem.imageInsets = insets;

//设置item.title位置偏移

UIOffset offset;

offset.horizontal = 30;

offset.vertical = -10;

[tabBarItem setTitlePositionAdjustment:offset];

效果如下：（虽然很难看，但是效果达到了）。