封装实现一个自己的tabbar

//
//  CSTabBar.m
//  diary
//
//  Created by asheng123 on 15/4/11.
//  Copyright (c) 2015年 asheng123. All rights reserved.
//

#import "CSTabBar.h"
@interface CSTabBar()
@property(nonatomic,weak)UIButton *plusButton;
@end
@implementation CSTabBar

-(instancetype)initWithFrame:(CGRect)frame
{
    if (self = [super initWithFrame:frame]) {
        [self setPlusButton];
    }
    return self;
}
-(void)setPlusButton
{
    UIButton * plusButton=[[UIButton alloc]init];
    [plusButton setBackgroundImage:[UIImage imageNamed:@"tabbar_compose_button"] forState:UIControlStateNormal];
    [plusButton setBackgroundImage:[UIImage imageNamed:@"tabbar_compose_button_highlighted"] forState:UIControlStateHighlighted];
    [plusButton setImage:[UIImage imageNamed:@"tabbar_compose_icon_add"] forState:UIControlStateNormal];
    [plusButton setImage:[UIImage imageNamed:@"tabbar_compose_icon_add_highlighted"] forState:UIControlStateHighlighted];
    [self addSubview:plusButton];
    self.plusButton = plusButton;
}
-(void)layoutSubviews
{
    [super layoutSubviews];
    
    [self setupPlusButtonFrame];
    [self setupallTabBarFrame];
}
-(void)setupPlusButtonFrame
{
    self.plusButton.size = self.plusButton.currentBackgroundImage.size;
    self.plusButton.center = CGPointMake(self.width*0.5, self.height*0.5);
}
-(void)setupallTabBarFrame
{
    int index= 0;
    for (UIView *tabBarButton in self.subviews) {
//        [tabBarButton isKindOfClassL: NSClassFromString(@"UITabBarButton")];
        BOOL isTabBar =[tabBarButton isKindOfClass:NSClassFromString(@"UITabBarButton")];
        if (!isTabBar) {
            continue;
        }
        [self setTabBarButtonFrame:tabBarButton withIndex:index];
        [self setTabBarButtonTextColor:tabBarButton withIndex:index];
    
        index++;
    }
    
}
//设置每一个tabbar对应的frame
//传进来的tabbar   也就是当前的一个按钮，那么要给他设定对应的值
-(void)setTabBarButtonFrame:(UIView *)tabBar withIndex:(int)index
{
    //首先取大小
    CGFloat tabWidth= self.width/(self.items.count +1);
    CGFloat tabHeight = self.height;
    
    //然后就是给对应控件赋值了
    if (index>=2) {
        tabBar.frame = CGRectMake(tabWidth*(index +1), 0, tabWidth, tabHeight);
    }else
    {
        tabBar.frame = CGRectMake(tabWidth *index, 0, tabWidth, tabHeight);
    }
    
}
//设置每一个tabbar对应的背景color
-(void)setTabBarButtonTextColor:(UIView *)tabBar withIndex:(int)index
{
    //要给每一个选中的tabbar对应一个background
    //比较重要的就是判断对应的index和当前选中的项目是不是相同
    int currentSelect= (int)[self.items indexOfObject:self.selectedItem];
    //判断对应的是不是选中的项
    for (UILabel *label in tabBar.subviews) {
        if (![label isKindOfClass:NSClassFromString(@"UILabel")]) {
            continue;
        }
        if (currentSelect == index) {
            label.textColor = [UIColor orangeColor];
        }else
        {
            label.textColor = [UIColor blackColor];
        }
    }
}
@end