自定义Tabbar

#import "FxianViewController.h"

#import "OneViewController.h"

#import "TwoViewController.h"

#import "ThreeViewController.h"

@interface FxianViewController ()<UIScrollViewDelegate>{

    UIScrollView *scr;

    UIButton*bun;

    UIScrollView*center;

}

@property (nonatomic,strong)UIButton *selbun;

@end

@implementationFxianViewController

- (void)viewDidLoad {

    [super viewDidLoad];

    [selfADDbtn];

    //添加顶部滚动式图

    [self setTopVc];

    //添加点击按钮

    [self setUpBun];

    //设置中间滚动

    [self setCenterVc];

}

-(void)ADDbtn{

    OneViewController *one=[[OneViewController alloc]init];

    one.title=@"语文";

    [self addChildViewController:one];

    TwoViewController *two=[[TwoViewController alloc]init];

    two.title=@"数学";

    [self addChildViewController:two];

    ThreeViewController *three=[[ThreeViewController alloc]init];

    three.title=@"数学";

    [self addChildViewController:three];

}

- (void)setTopVc{

    scr=[[UIScrollView alloc]initWithFrame:CGRectMake(0, 64, self.view.frame.size.width, 100)];

    scr.backgroundColor=[UIColor whiteColor];

    scr.bounces=NO  ;

    [self.view addSubview:scr];

}

- (void)setUpBun{

    NSInteger count=self.childViewControllers.count;

    for(NSIntegeri=0; I<count;i++){

        bun=[[UIButton alloc]initWithFrame:CGRectMake(i*100, 0, 100, 40)];

        bun.tag=i;

        NSLog(@"tag :%ld",bun.tag);

        if(i==0) {

            [selfppp:bun];

        }

        UIViewController *vc=self.childViewControllers[i];

        [bun setTitle:vc.title forState:UIControlStateNormal];

        [bun setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];

        [bun setTitleColor:[UIColor redColor] forState:UIControlStateSelected];

        [bun addTarget:self action:@selector(ppp:) forControlEvents:UIControlEventTouchUpInside];

        [scraddSubview:bun];

        scr.contentSize=CGSizeMake(count *100,0);

    }

}

- (void)setCenterVc{

    center=[[UIScrollView alloc]initWithFrame:CGRectMake(0, 130, self.view.frame.size.width,self.view.frame.size.height - 130)];

    center.backgroundColor=[UIColor greenColor];

    [self.view addSubview:center];

    center.pagingEnabled=YES;

    center.bounces=NO;

    center.delegate=self;

    center.contentSize=CGSizeMake([UIScreen mainScreen].bounds.size.width*self.childViewControllers.count, 0);

    for (int i=0; i<self.childViewControllers.count; i++) {

        UIViewController *vc=self.childViewControllers[i];

        vc.view.frame=CGRectMake(self.view.frame.size.width*i, 0, self.view.frame.size.width, self.view.frame.size.height);

        [centeraddSubview:vc.view];

    }

}

- (void)ppp:(UIButton*)sender{

    [selfselbun:sender];

    //滚动到对应页面的偏移量

    CGFloat ofsetX = sender.tag*self.view.frame.size.width;

    NSLog(@"%ld",sender.tag);

    //设置中间滚动式图的偏移量

    center.contentOffset=CGPointMake(ofsetX,0);

    //添加对应子控制器view到对应的位置

    UIViewController *vc=self.childViewControllers[sender.tag];

    //设置子控制器view的位置

    vc.view.frame=CGRectMake(ofsetX, 0, self.view.frame.size.width, self.view.frame.size.height);

    [centeraddSubview:vc.view];

}

- (void)selbun:(UIButton*)sender{

    _selbun.selected=NO;

    sender.selected=YES;

    _selbun=sender;

}