定制 tabBar 按钮中心。
#import "FLTabBarController.h"
LObject *one = [[FLObject alloc]initWithViewController:[[OneViewController alloc]init] title:@"one" imageName:@"one" selectedImageName:@"one" isCustomImageView:NO];
FLTabBarController *tabbarController = [[FLTabBarController alloc] initWithTabItems:@[one,two,three,four,five]];