UIBarItem 的设置

常见设置如下

#import "TRTabBarController.h"

@interface TRTabBarController ()<TRtabBarDelegate>

@end

@implementation TRTabBarController

　　 //设置选中后的背景图
    [self.tabBar setSelectionIndicatorImage:[UIImage imageNamed:@"delete_btn"]];
   

//遍历tabVarControoler 中的子视图，来改变样式
    for (UIViewController*vc in self.viewControllers) {
    //读取设置过的选中图片
        vc.tabBarItem.selectedImage=[vc.tabBarItem.selectedImage imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal];
        //设置vc的tabbarItem的文字样式
        UITabBarItem*baritem=vc.tabBarItem;
        //设置item的文字位置
        [baritem setTitlePositionAdjustment:UIOffsetMake(0, -2)];
        //字体变大
       NSMutableDictionary *nomalattributes=[NSMutableDictionary dictionary];
        nomalattributes[NSFontAttributeName]=[UIFont systemFontOfSize:13];
        nomalattributes[NSForegroundColorAttributeName]=[UIColor colorWithRed:128/255.0 green:128/255.0 blue:128/255.0 alpha:1];
        [baritem setTitleTextAttributes:nomalattributes forState:UIControlStateNormal];
        
        
        NSMutableDictionary *selectedAttributes2=[NSMutableDictionary dictionary];
        selectedAttributes2[NSFontAttributeName]=[UIFont systemFontOfSize:13];
       selectedAttributes2[NSForegroundColorAttributeName]=[UIColor colorWithRed:8/255.0 green:232/255.0 blue:13/255.0 alpha:1];
        [baritem setTitleTextAttributes: selectedAttributes2 forState:UIControlStateSelected];