new/二期/General/Root/CustomTabBar.m

//
//  CustomTabBar.m
//  DouBanProject
//
//  Created by wuli萍萍 on 16/5/6.
//  Copyright © 2016年 wuli萍萍. All rights reserved.
//

#import "CustomTabBar.h"

#define NUM_TAB 3.0
@implementation CustomTabBar

- (void)layoutSubviews
{
    
    [super layoutSubviews];
//        [self setBackgroundImage:[UIImage imageNamed:@"background_tab"]];
//        [self setBackgroundColor:[UIColor clearColor]];
//
//        [self setShadowImage:[UIImage new]];
    
    //系统自带的按钮类型是UITabBarButton，找出这些类型的按钮，然后重新排布位置，空出中间的位置
    Class class = NSClassFromString(@"UITabBarButton");
    
    
    int btnIndex = 0;
    for (UIView *btn in self.subviews) {//遍历tabbar的子控件
        if ([btn isKindOfClass:class]) {
            btn.width = self.width / NUM_TAB;
            
            btn.x = btn.width * btnIndex;
            
            btnIndex++;
            
        }
    }
    
}

@end