UITabBarController的實現方法

2、新建三個file，都繼承uiviewcontroller，分別取名為firstviewcontroller，secondviewcontroller，thirdviewcontroller。且都帶有xib檔案，三個xib檔案的背景分別設定為黃色、墨綠色、紅色；

3、新建乙個file，繼承uitabbarcontroller，取名為tabbarcontroller

4、在tabbarcontroller.m檔案中首先匯入三個檔案

#import "firstviewcontroller.h"

#import"secondviewcontroller.h"

#import"thirdviewcontroller.h"

然後在viewdidload方法裡面新增如下**：

firstviewcontroller*firstviewcontroller=[[firstviewcontroller alloc]initwithnibname:@"firstviewcontroller" bundle:nil];

firstviewcontroller.title=@"first";

（若想加上，可新增如下**

firstviewcontroller.tabbaritem.image =[uiimage imagenamed:@"first.png"];

） secondviewcontroller*secondviewcontroller=[[secondviewcontroller alloc]initwithnibname:@"secondviewcontroller"bundle:nil];

secondviewcontroller.title=@"second";

thirdviewcontroller *thirdviewcontroller=[[thirdviewcontroller alloc] initwithnibname:@"thirdviewcontroller" bundle:nil];

thirdviewcontroller.title=@"third";

thirdviewcontroller.tabbaritem.image =[uiimage imagenamed:@"third.png"];

tabbarcontroller *tabbarcontroller=[[tabbarcontroller

alloc]init];

self.window.rootviewcontroller=tabbarcontroller;

實現結果如圖所示：