自定义标签栏（重用性高的方法）

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- (void)addItemWithIcon:(NSString *)icon title:(NSString *)title {//1.初始化CustomTabBarItem *item = [[CustomTabBarItem alloc]init];[item setImage:[UIImage imageNamed:icon] forState:UIControlStateNormal];[item setTitle:title forState:UIControlStateNormal];[item addTarget:self action:@selector(buttonPressed:) forControlEvents:UIControlEventTouchUpInside];//2.添加子视图[self addSubview:item];//3.调整item的frame[self itemFrame];
}
//很好地一个方法
- (void)itemFrame {NSInteger count = self.subviews.count;CGFloat height = CGRectGetHeight(self.bounds);CGFloat width = CGRectGetWidth(self.bounds) / count;for (int i = 0; i < count; i ++) {CustomTabBarItem *tabBarItem = self.subviews[i];tabBarItem.tag = i; //绑定标记tabBarItem.frame = CGRectMake(width * i, 0, width, height);}
}

自定义标签View (

CustomTabBarItem (按钮)

)

可重用性高，

设置点击事件监听的代理

@protocol CustomTabBarDlegate <NSObject>
@optional
- (void)customTabBar:(CustomTabBarView *)tabBar itemSelectedFrom:(NSInteger)from to:(NSInteger)to;@end

@property (nonatomic,weak)id<CustomTabBarDlegate> delegate;

- (void)buttonPressed:(CustomTabBarItem *)item {//通知代理：if ([_delegate respondsToSelector:@selector(customTabBar:itemSelectedFrom:to:)]) {[_delegate customTabBar:self itemSelectedFrom:_selectedItem.tag to:item.tag];}_selectedItem = item;
}

在外面使用：（要增加标签直接再写add方法就行了）

 //1.添加 CustomTabBarViewcustomTabBarView = [[CustomTabBarView alloc]initWithFrame:CGRectMake(0, CGRectGetHeight(self.view.bounds) - CUSTOMTABBARVIEW_HEIGHT,CGRectGetWidth(self.view.bounds), CUSTOMTABBARVIEW_HEIGHT)];customTabBarView.delegate = self;[self.view addSubview:customTabBarView];//2.往 CustomTabBarView 里添加内容[customTabBarView addItemWithIcon:@"商品" title:@"xiangu"];[customTabBarView addItemWithIcon:@"消息" title:@"xiangu"];[customTabBarView addItemWithIcon:@"订单" title:@"xiangu"];//3.添加其他控制器[self customTabBar:customTabBarView itemSelectedFrom:0 to:0];

切换视图控制器

#pragma mark - CustomTabBarView的代理方法
- (void)customTabBar:(CustomTabBarView *)tabBar itemSelectedFrom:(NSInteger)from to:(NSInteger)to {NSLog(@"%ld,%ld",from,to);[_currentVC.view removeFromSuperview];[_currentVC removeFromParentViewController];if (to == 0) {UIViewController *vc = [[UIViewController alloc]init];self.view.backgroundColor = [UIColor greenColor];[self.view addSubview:vc.view];[self addChildViewController:vc];_currentVC = vc;}else if (to == 1){UIViewController *vc = [[UIViewController alloc]init];vc.view.backgroundColor = [UIColor redColor];[self.view addSubview:vc.view];[self addChildViewController:vc];_currentVC = vc;}else {UIViewController *vc = [[UIViewController alloc]init];vc.view.backgroundColor = [UIColor orangeColor];[self.view addSubview:vc.view];[self addChildViewController:vc];_currentVC = vc;}[self.view bringSubviewToFront:customTabBarView];}

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