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Android中习惯了叫侧边栏，iOS中如果不习惯侧边栏称呼的话可以叫dock，侧边栏的切换，类似于Android中的底部导航栏的切换，iPad尺寸大了一些，导航的栏目放在侧边会显示的更好耐看一些。选项卡是用按钮实现的，通过按钮的状态控制按钮的背景图片，最后通过按钮的Tag属性进行相对应的操作，iPad需要考虑一个横竖屏的问题，不过现在有些项目为了效果也好，为了开发效率也罢，可能只是选中了横屏效果。

基本布局

布局之前先来看一下最终需要实现的效果:

iOS开发-iPad侧边栏Tab选项卡切换

 

需要最四个图片进行相应的操作，通过图片控制最后的切换效果，黑色的属于侧边栏的区域，四个图片是按钮的背景图片，不过由于需要经常操作区域的宽度和按钮的宽度，需要预定义一下,新建一个Common.h文件，如果你不习惯，你也可以定义为Config.h，能看懂即可:

//侧边栏条目的尺寸
#define GPDockItemWidth 100
#define GPDockItemHeight 80

在之前的xCode中是默认的有pch文件的，xCode6.1中没有，需要新建一个pch文件:

iOS开发-iPad侧边栏Tab选项卡切换

 

新建之后并不能保证你运行成功，还需要去编译中设置一下Prefix header($(SRCROOT)/PrefixHeader.pch)，清理下项目，导入Common.h文件即可成功；

iOS开发-iPad侧边栏Tab选项卡切换

Demo实战

①首先需要新建一个GPMainController控制器，控制页面页面逻辑:

 

 

//
//  GPMainController.h
//  GrouponProject
//Http://www.cnblogs.com/xiaofeixiang
//  Created by keso on 15/3/9.
//  Copyright (c) 2015年 keso. All rights reserved.
//

#import <UIKit/UIKit.h>
#import "GPDock.h"

@interface GPMainController : UIViewController <GPDockItemDelegate>


@end

 

需要在ViewDidLoad加载侧边栏区域:

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view.
    self.view.backgroundColor=[UIColor greenColor];
    
    //加入侧边栏Dock
    GPDock *dock=[[GPDock alloc]initWithFrame:CGRectMake(0, 0,GPDockItemWidth, self.view.frame.size.height)];
    dock.dockDelegate=self;
    [self.view addSubview:dock];

}

　响应侧边栏的点击事件，需要用到委托，如果委托不是很熟悉，可以参考本人之前的博客：

-(void)switchMainByTabItem:(GPDock *)gpdock originalTab:(int)start destinationTab:(int)end{
    switch (end) {
        case 0:
            self.view.backgroundColor=[UIColor blackColor];
            break;
        case 1:
            self.view.backgroundColor=[UIColor blueColor];
            break;
        case 2:
            self.view.backgroundColor=[UIColor redColor];
            break;
        case 3:
            self.view.backgroundColor=[UIColor purpleColor];
            break;
        default:
            break;
    }
    
}

GPMainContrller主要用于处理页面的逻辑，同时需要在AppDelegate中设置一下根控制器:

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
    // Override point for customization after application launch.
    [UIView setAnimationDuration:2.0];
    self.window.rootViewController=[[GPMainController alloc]init];
    return YES;
}

②设置侧边栏区域，继承自UIView:

//
//  GPDock.h
//  GrouponProject
//http://www.cnblogs.com/xiaofeixiang
//  Created by keso on 15/3/10.
//  Copyright (c) 2015年 keso. All rights reserved.
//

#import <UIKit/UIKit.h>
#import "GPTabItem.h"
@class GPDock;
@protocol GPDockItemDelegate <NSObject>

-(void)switchMainByTabItem:(GPDock*)gpdock originalTab:(int)start destinationTab:(int)end;

@end

@interface GPDock : UIView
{
    GPTabItem *selectedTabItem;
}
@property (nonatomic,weak) id<GPDockItemDelegate> dockDelegate;

@end

初始化侧边栏:

-(instancetype)initWithFrame:(CGRect)frame{
    self=[super initWithFrame:frame];
    if (self) {
        //自动伸缩高度可伸缩，右边距可以伸缩
        self.autoresizingMask=UIViewAutoresizingFlexibleHeight|UIViewAutoresizingFlexibleRightMargin;
       //设置背景图片
        self.backgroundColor=[UIColor colorWithPatternImage:[UIImage imageNamed:@"Toolbar_bg_tabbar.png"]];
        [self addTabItems];
    }
    return self;
}

　添加Tab选项卡:

//添加Tab选项卡
- (void)addTabItems
{
     //首页
    [self addSingleTab:@"Toolbar_searchshop.png" selectedImage:@"Toolbar_searchshop_selected.png" weight:1];
 
    //团购
    [self addSingleTab:@"Toolbar_groupon.png" selectedImage:@"Toolbar_groupon_selected.png" weight:2];

    //排行榜
    [self addSingleTab:@"Toolbar_ranklist.png" selectedImage:@"Toolbar_ranklist_selected.png" weight:3];
    
    // 个人中心
    [self addSingleTab:@"Toolbar_usercenter.png" selectedImage:@"Toolbar_usercenter_selected.png" weight:4];
    
}

因为代码类似，所以封装到一个方法里面:

- (void)addSingleTab:(NSString *)backgroundImage selectedImage:(NSString *)selectedImage weight:(int)weight
{
    GPTabItem *tabItem=[[GPTabItem alloc]init];
    [tabItem setBackgroundImage:backgroundImage];
    [tabItem setSelectedImage:selectedImage];
    //设置位置
    tabItem.frame = CGRectMake(0, GPDockItemHeight * (weight+1), 0, 0);
    //设置选中触摸选中事件
    [tabItem addTarget:self action:@selector(tabItemTouchEvent:) forControlEvents:UIControlEventTouchDown];
    tabItem.tag = weight - 1;
    [self addSubview:tabItem];
    
}

　设置触摸事件:

//设置触摸事件
- (void)tabItemTouchEvent:(GPTabItem *)tabItem
{

    if ([self.dockDelegate respondsToSelector:@selector(switchMainByTabItem:originalTab:destinationTab:)]) {
        [self.dockDelegate switchMainByTabItem:self originalTab:selectedTabItem.tag destinationTab:tabItem.tag];
    }
    selectedTabItem.enabled=YES;
    tabItem.enabled = NO;
    //将当前选中的赋值
    selectedTabItem =tabItem;
}

③封装侧边栏的GPDockItem，然后选项卡上的可以继承：

//
//  GPDockItem.h
//  GrouponProject
//博客园FlyElephant:http://www.cnblogs.com/xiaofeixiang
//  Created by keso on 15/3/11.
//  Copyright (c) 2015年 keso. All rights reserved.
//

#import <UIKit/UIKit.h>

@interface GPDockItem : UIButton

//背景图片
@property (nonatomic,strong)  NSString  *backgroundImage;
//选中图片
@property (nonatomic,strong)  NSString  *selectedImage;

@end

　设置背景图片和选中图片:

//
//  GPDockItem.m
//  GrouponProject
//博客园FlyElephant:http://www.cnblogs.com/xiaofeixiang
//  Created by keso on 15/3/11.
//  Copyright (c) 2015年 keso. All rights reserved.
//

#import "GPDockItem.h"

@implementation GPDockItem

/*
// Only override drawRect: if you perform custom drawing.
// An empty implementation adversely affects performance during animation.
- (void)drawRect:(CGRect)rect {
    // Drawing code
}
*/

-(instancetype)initWithFrame:(CGRect)frame{
    self=[super initWithFrame:frame];
    if (self) {
        // Item分割线
        UIImageView *splitLine = [[UIImageView  alloc] init];
        splitLine.frame = CGRectMake(0, 0, GPDockItemWidth, 2);
        splitLine.image = [UIImage imageNamed:@"separator_tabbar_item.png"];
        [self addSubview:splitLine];
    }
    return self;

}
//设置背景图片
-(void)setBackgroundImage:(NSString *)backgroundImage{
    
    _backgroundImage=backgroundImage;
    [self setImage:[UIImage imageNamed:backgroundImage] forState:UIControlStateNormal];
    
}
//设置选中图片
-(void)setSelectedImage:(NSString *)selectedImage{
    _selectedImage=selectedImage;
    [self setImage:[UIImage imageNamed:selectedImage] forState:UIControlStateDisabled];
    
}

-(void)setFrame:(CGRect)frame{
    //固定Item宽高
    frame.size=CGSizeMake(GPDockItemWidth, GPDockItemHeight);
    [super setFrame:frame];
}

@end

　GPTabItem代码:

#import "GPDockItem.h"

@interface GPTabItem : GPDockItem

@end

设置选中时的背景图片:

//
//  GPTabItem.m
//  GrouponProject
//博客园FlyElephant:http://www.cnblogs.com/xiaofeixiang
//  Created by keso on 15/3/11.
//  Copyright (c) 2015年 keso. All rights reserved.
//

#import "GPTabItem.h"

@implementation GPTabItem

/*
// Only override drawRect: if you perform custom drawing.
// An empty implementation adversely affects performance during animation.
- (void)drawRect:(CGRect)rect {
    // Drawing code
}
*/

-(instancetype)initWithFrame:(CGRect)frame{
    self=[super initWithFrame:frame];
    if (self) {
    // 设置选中时背景图片
    [self setBackgroundImage:[UIImage imageNamed:@"bg_tabbar_item.png"] forState:UIControlStateDisabled];
    }
    return self;
}

@end

　最终效果如下:

iOS开发-iPad侧边栏Tab选项卡切换

　代码相对以往较多，如有遗漏，请随时与我联系，如有好感，推荐或关注均可~

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