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:
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:
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；
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:
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~