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