自定义UITabbarController控制器

//
//  ViewController.m
//  TabbarController
//
//  Created by XianMingYou on 15/4/15.
//  Copyright (c) 2015年 XianMingYou. All rights reserved.
//

#import "ViewController.h"

#import "FirstViewController.h"
#import "SecondViewController.h"

#import "UIButton+DemoUse.h"

typedef enum : NSUInteger {
    FIRST = 0x12,
    SECOND,
    BACK_VIEW,
} EButtonFlag;

@interface ViewController ()

@property (nonatomic, strong) FirstViewController  *first;
@property (nonatomic, strong) SecondViewController *second;

@property (nonatomic, strong) UIViewController     *current;

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    
    self.view.backgroundColor = [UIColor whiteColor];
    
    // 初始化第一个控制器
    self.first   = [FirstViewController new];
    [self addChildViewController:self.first];
    
    // 初始化第二个控制器
    self.second = [SecondViewController new];
    [self addChildViewController:self.second];
    
    // 加载第一个控制器的视图
    [self.first didMoveToParentViewController:self];
    [self.view addSubview:self.first.view];
    
    // 简易存储当前控制器
    self.current = self.first;
    
    // 创建出按钮
    [self createButtons];
}

- (void)createButtons {
    UIView *backView = [[UIView alloc] initWithFrame:CGRectMake(0, 200, 320, 80)];
    backView.tag     = BACK_VIEW;
    [self.view addSubview:backView];
    
    // 控制器1按钮
    [UIButton createButtonWithFrame:CGRectMake(10, 0, 145, 80)
                            withTag:FIRST
                          withTitle:@"First"
                           withFont:nil
                          addTarget:self
                             action:@selector(buttonEvent:)
                         haveBorder:YES
                       insertInView:backView];
    
    // 控制器2按钮
    [UIButton createButtonWithFrame:CGRectMake(10 + 155, 0, 145, 80)
                            withTag:SECOND
                          withTitle:@"Second"
                           withFont:nil
                          addTarget:self
                             action:@selector(buttonEvent:)
                         haveBorder:YES
                       insertInView:backView];
}

- (void)buttonEvent:(UIButton *)button {
    
    if (button.tag == FIRST) {
        
        // 此句话必加(否则点击两次的话会报错)
        if ([self.current isEqual:self.first]) {
            return;
        }
        
        // 控制器转场
        [self transitionFromViewController:self.current
                          toViewController:self.first
                                  duration:0
                                   options:UIViewAnimationOptionTransitionNone
                                animations:^{
                                }  completion:^(BOOL finished) {
                                    self.current = self.first;
                                    
                                    // 将按钮设置到最前面
                                    [self.view bringSubviewToFront:[self.view viewWithTag:BACK_VIEW]];
                                }];
        
    } else if (button.tag == SECOND) {
        
        // 此句话必加(否则点击两次的话会报错)
        if ([self.current isEqual:self.second]) {
            return;
        }
        
        // 控制器转场
        [self transitionFromViewController:self.current
                          toViewController:self.second
                                  duration:0
                                   options:UIViewAnimationOptionTransitionNone
                                animations:^{
                                }  completion:^(BOOL finished) {
                                    self.current = self.second;
                                    
                                    // 将按钮设置到最前面
                                    [self.view bringSubviewToFront:[self.view viewWithTag:BACK_VIEW]];
                                }];
        
    }
    
}

@end