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demo:

#import "ZCNavTabBarDemoViewController.h"
#import "ZCNavTabBar.h"
#import "ZCNavToolBar.h"

@interface ZCNavTabBarDemoViewController ()
@property (nonatomic,strong) ZCNavToolBar       *navToolBar;
@property (nonatomic,strong) ZCNavTabBar        *navTabBar;
@property (nonatomic,strong) UIViewController1  *vc1;
@property (nonatomic,strong) UIViewController2  *vc2;
@property (nonatomic,strong) UIViewController3  *vc3;
@property (nonatomic,strong) UIViewController4  *vc4;
@end

@implementation ZCNavTabBarDemoViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    [self setupContentView];
}

- (void)setupContentView {
    //设置内容view
    [self.view addSubview:self.navTabBar];
    //设置title
    self.navigationItem.titleView = self.navToolBar;
    
    //赋值
    __weak typeof(self) weakSelf = self;
    _navTabBar.childViewsTitle = ^NSMutableArray<NSString *> *{
        NSMutableArray *array = [[NSMutableArray alloc]init];
        [array addObject:@"title1"];
        [array addObject:@"title2"];
        [array addObject:@"title3"];
        [array addObject:@"title4"];
        return array;
    };
    
    _navTabBar.gl_setCurrentVC = ^UIViewController *(NSInteger index) {
        UIViewController *vc;
        switch (index) {
            case 0:
                vc = weakSelf.vc1;
                break;
            case 1:
                vc = weakSelf.vc2;
                break;
            case 2:
                vc = weakSelf.vc3;
                break;
            case 3:
                vc = weakSelf.vc4;
                break;
            default:
                break;
        }
        return vc;
    };

    _navTabBar.currentPage = 2;
    [_navTabBar reloadData];
}

- (UIViewController1 *)vc1 {
    if (_vc1) return _vc1;
    _vc1 = [[UIViewController1 alloc]init];
    return _vc1;
}

- (UIViewController2 *)vc2 {
    if (_vc2) return _vc2;
    _vc2 = [[UIViewController2 alloc]init];
    return _vc2;
}

- (UIViewController3 *)vc3 {
    if (_vc3) return _vc3;
    _vc3 = [[UIViewController3 alloc]init];
    return _vc3;
}

- (UIViewController4 *)vc4 {
    if (_vc4) return _vc4;
    _vc4 = [[UIViewController4 alloc]init];
    return _vc4;
}

- (ZCNavToolBar *)navToolBar {
    if (_navToolBar) return _navToolBar;
    _navToolBar = self.navTabBar.navToolBar;
    _navToolBar.backgroundColor = [UIColor clearColor];
    _navToolBar.seletedTitleFont = [UIFont boldSystemFontOfSize:16];
    _navToolBar.tooBarTitleFont = [UIFont systemFontOfSize:15];
    _navToolBar.margin = 5.0;
    _navToolBar.unSeletedTitleColor = [UIColor whiteColor];
    _navToolBar.bottomSlideLineColor = [UIColor whiteColor];
    _navToolBar.seletedTitleColor = [UIColor whiteColor];
    _navToolBar.frame = CGRectMake(0,0,[UIScreen mainScreen].bounds.size.width-100,44);
    return _navToolBar;
}

- (ZCNavTabBar *)navTabBar {
    if (_navTabBar) return _navTabBar;
    _navTabBar = [[ZCNavTabBar alloc]init];
    _navTabBar.target = self;
    _navTabBar.frame = self.view.bounds;
    _navTabBar.scrollEnabled = YES;
    return _navTabBar;
}

@end




//----------------------------------------------------------------

@implementation UIViewController1
- (void)viewDidLoad {
    [super viewDidLoad];
    self.view.backgroundColor = [UIColor redColor];
}
@end

@implementation UIViewController2
- (void)viewDidLoad {
    [super viewDidLoad];
    self.view.backgroundColor = [UIColor blueColor];
}
@end

@implementation UIViewController3
- (void)viewDidLoad {
    [super viewDidLoad];
    self.view.backgroundColor = [UIColor blackColor];
}
@end

@implementation UIViewController4
- (void)viewDidLoad {
    [super viewDidLoad];
    self.view.backgroundColor = [UIColor yellowColor];
}
@end