iOS自定义TabBar

1、TabBarButton继承UIButton setHighlighted 方法，去掉选中高亮状态，还可以根据需求自定义Button的字体，字体颜色，背景图片等等

//
//  TabBarItem.m
//  TabBarDemo
//
//  Created by iOS on 15/12/10.
//  Copyright © 2015年 iOS. All rights reserved.
//

#import "TabBarItem.h"

@implementation TabBarItem



- (void)setHighlighted:(BOOL)highlighted{
    
}

@end

2、TabBar继承Uiview  来设置TabBar

//
//  TabBar.m
//  TabBarDemo
//
//  Created by iOS on 15/12/10.
//  Copyright © 2015年 iOS. All rights reserved.
//

#import "TabBar.h"
#import "TabBarItem.h"


@interface TabBar()
@property(nonatomic,weak)UIButton *selectedBtn;
@end

@implementation TabBar


- (void)layoutSubviews{
    [super layoutSubviews];
    
    NSInteger count = self.subviews.count;
    
    for (NSInteger i=0; i<count; i++) {
        UIButton *btn = self.subviews[i];
        btn.tag = i;
        CGFloat x = i*self.frame.size.width/count;
        CGFloat y = 0;
        CGFloat w = self.frame.size.width/count;
        CGFloat h = self.frame.size.height;
        
        btn.frame = CGRectMake(x, y, w, h);
        
    }
}


- (void)addButtonItem{
    UIButton *btn = [UIButton buttonWithType:UIButtonTypeCustom];
    [self addSubview:btn];
    
    [btn addTarget:self action:@selector(click:) forControlEvents:UIControlEventTouchUpInside];
    
    if (self.subviews.count==1) {
        [self click:btn];
    }
}

- (void)click:(UIButton *)btn{
    
    self.selectedBtn.selected = NO;
    btn.selected = YES;
    
    self.selectedBtn = btn;
    
    if ([self.delegate respondsToSelector:@selector(tabBar:selectedFrom:to:)]) {
        [self.delegate tabBar:self selectedFrom:self.selectedBtn.tag to:btn.tag];
    }
}

@end

3、TabBarController

//
//  MainViewController.m
//  TabBarDemo
//
//  Created by iOS on 15/12/10.
//  Copyright © 2015年 iOS. All rights reserved.
//

#import "MainViewController.h"
#import "TabBar.h"
#import "TabBarItem.h"
#import "OneViewController.h"
#import "TwoViewController.h"
#import "ThreeViewController.h"
#import "FourViewController.h"
#import "FiveViewController.h"
#import "SixViewController.h"
@interface MainViewController ()<TabBarDelegate>
@property(nonatomic, weak) UIButton *selectedBtn;
@property(nonatomic,weak)TabBar *tab;
@end

@implementation MainViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    
    CGRect rect = self.tabBar.bounds;
    TabBar *tab =[[TabBar alloc]init];
    tab.backgroundColor = [UIColor redColor];
    tab.delegate = self;
    tab.frame = rect;
    [self.tabBar addSubview:tab];
    
    self.tab = tab;
    
    
    OneViewController *oneVC = [[OneViewController alloc]init];
    
    [self setUpVieController:oneVC title:@"One"];
    
    TwoViewController *twoVC = [[TwoViewController alloc]init];
    [self setUpVieController:twoVC title:@"Two"];
    
    ThreeViewController *threeVC = [[ThreeViewController alloc]init];
    
    [self setUpVieController:threeVC title:@"ThreeVC"];
    
    FourViewController *fourVC = [[FourViewController alloc]init];
    
    [self setUpVieController:fourVC title:@"Four"];
    
    FiveViewController *fiveVC = [[FiveViewController alloc]init];
    
    [self setUpVieController:fiveVC title:@"FiveVC"];
    
    
}




- (void)setUpVieController:(UIViewController *)vc title:(NSString *)title{
    
    vc.title = title;
    
    [self addChildViewController:vc];
    
    [self.tab addButtonItem];
    
}


- (void)tabBar:(TabBar *)tabBar selectedFrom:(NSInteger)from to:(NSInteger)to{
}

@end