ios 自定义带下划线的tab切换按钮

1. 创建2个tab栏切换的TabBar

#pragma mark -- 创建顶部Tab切换按钮- (void)createTopTabBarSegment{    if(!_segmentLineView)    {        _segmentLineView = [[UIView alloc] initWithFrame:CGRectMake((kDEVICEWIDTH - TOPTABBARWIDTH*2 - 35)/2.0, 20+38, TOPTABBARWIDTH, 2)];        _segmentLineView.backgroundColor = loadColor(@"0093ff");        [self.view addSubview:_segmentLineView];    }        ／／多少个tab    for (NSInteger i = 0; i < _segmentTitleArray.count; i++)    {        UIButton * segmentButton = [UIButton buttonWithType:UIButtonTypeCustom];        segmentButton.frame = CGRectMake((kDEVICEWIDTH - TOPTABBARWIDTH*2 - 35)/2.0 + TOPTABBARWIDTH*i, 20, TOPTABBARWIDTH, 40);        segmentButton.tag = 9999 + i;        [segmentButton setTitle:[_segmentTitleArray objectAtIndex:i] forState:UIControlStateNormal];        [segmentButton setTitle:[_segmentTitleArray objectAtIndex:i] forState:UIControlStateSelected];        [segmentButton  setTitleColor:TFCOLOR_68758E forState:UIControlStateNormal];        [segmentButton  setTitleColor:loadColor(@"0093ff")  forState:UIControlStateSelected];        segmentButton.titleLabel.font = loadFont(18.f);        [segmentButton addTarget:self action:@selector(didTopTabSelectClick:) forControlEvents:UIControlEventTouchUpInside];        [self.view addSubview:segmentButton];        if (i == 0)//默认选中第一个tab        {            _selectedTabBtn = segmentButton;            [segmentButton setSelected:YES];        }    }}#pragma mark --  顶部tab选择事件- (void)didTopTabSelectClick:(UIButton*)sender{    _segmentLineView.frame = CGRectMake((kDEVICEWIDTH - TOPTABBARWIDTH*2 - 35)/2.0 + TOPTABBARWIDTH * (sender.tag - 9999), 20+38, TOPTABBARWIDTH, 2);    _selectedTabBtn.selected = !_selectedTabBtn.selected;    sender.selected = !sender.selected;    _selectedTabBtn = sender;        if (sender.tag == 9999)    {        self.currentSelectedTabIndex = 0;    }    else if (sender.tag == 10000)    {
        self.currentSelectedTabIndex = 1;
 }}
//清除顶部的tabBar UI上的数据- (void)clearTopTabBarSegment{ //先将顶部的View移除掉，再去添加   UIButton *ljBtn = (UIButton*)[self.view viewWithTag:9999]; if (ljBtn) { [ljBtn removeFromSuperview]; } UIButton *ljBtn1 = (UIButton*)[self.view viewWithTag:10000]; if (ljBtn1) { [ljBtn1 removeFromSuperview]; }  if(_segmentLineView) { [_segmentLineView removeFromSuperview]; _segmentLineView = nil; }}


2. 当从第一个页面里面的某一个button切换到第二个tab时，可以这样处理
#pragma mark -- 查看按钮点击- (void)aroundClicked{    CHDebugLog(@"%s",__FUNCTION__);        if (_selectedTabBtn.tag == 9999)    {        if ([self respondsToSelector:@selector(didTopTabSelectClick:)])        {             UIButton *ljBtn1 = (UIButton*)[self.view viewWithTag:10000];／／将当前页面里面的第二个tab找到传过去             [self performSelector:@selector(didTopTabSelectClick:) withObject:ljBtn1];        }    }}


                                             
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