iOS滚动的导航条(仿网易新闻)

实现效果

效果：选择不同的栏目，下面出现不同的视图，栏目条可以滚动；下面的视图也可以滚动，滚动时上面对应的栏目要选中颜色为红色；

滚动的导航条包括两部分：标题滚动视图(UIScrollView)，内容滚动视图(UIScrollView)

实现代码

首先实现Main.storyboard
创建多个子控制器:头条、科技、汽车、体育、视频、图片、热点

// 头条ViewController, 其它控制器和这个控制器都一样，只是背景颜色不同而已
#import <UIKit/UIKit.h>
@interface TopLineViewController : UIViewController@end
//----------------------------------------------------------------
#import "TopLineViewController.h"
@interface TopLineViewController ()@end@implementation TopLineViewController
- (void)viewDidLoad {[super viewDidLoad];self.view.backgroundColor = [UIColor blackColor];
}
@end

实现Main.storyboard对应的视图控制器ViewController

#import <UIKit/UIKit.h>
@interface ViewController : UIViewController@end
//----------------------------------------------------------------
#import "ViewController.h"
#import "TopLineViewController.h"
#import "TechnologyViewController.h"
#import "CarViewController.h"
#import "SportsViewController.h"
#import "VideoViewController.h"
#import "ImageViewController.h"
#import "HotViewController.h"#define ScreenWidth [UIScreen mainScreen].bounds.size.width
#define ScreenHeight [UIScreen mainScreen].bounds.size.height@interface ViewController () <UIScrollViewDelegate>@property (weak, nonatomic) IBOutlet UIScrollView *titleScrollView;@property (weak, nonatomic) IBOutlet UIScrollView *contentScrollView;@property (strong, nonatomic) NSMutableArray *buttons;
@property (strong, nonatomic) UIButton *selectedButton;@end@implementation ViewController- (void)viewDidLoad {[super viewDidLoad];self.navigationItem.title = @"网易新闻";// 1. 初始化标题滚动视图上的按钮[self initButtonsForButtonScrollView];}- (void) initButtonsForButtonScrollView {// 初始化子控制器[self initChildViewControllers];CGFloat buttonWidth = 100;CGFloat buttonHeight = 40;NSInteger childViewControllerCount = self.childViewControllers.count;for (NSInteger i = 0; i < childViewControllerCount; i++) {UIViewController *childViewController = self.childViewControllers[i];UIButton *titleButton = [UIButton buttonWithType:UIButtonTypeCustom];titleButton.tag = i;CGFloat x = i * buttonWidth;titleButton.frame = CGRectMake(x, 0, buttonWidth, buttonHeight);[titleButton setTitle:childViewController.title forState:UIControlStateNormal];[titleButton setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];[titleButton addTarget:self action:@selector(titleButtonOnClick:) forControlEvents:UIControlEventTouchUpInside];[self.titleScrollView addSubview:titleButton];[self.buttons addObject:titleButton];}self.titleScrollView.contentSize = CGSizeMake(buttonWidth * childViewControllerCount, 0);self.titleScrollView.showsHorizontalScrollIndicator = NO;self.titleScrollView.bounces = NO;self.contentScrollView.contentSize = CGSizeMake(ScreenWidth * childViewControllerCount, 0);self.contentScrollView.showsHorizontalScrollIndicator = NO;self.contentScrollView.pagingEnabled = YES;self.contentScrollView.delegate = self;// 禁止额外滚动区域self.automaticallyAdjustsScrollViewInsets = NO;// 初始化时默认选中第一个[self titleButtonOnClick:self.buttons[0]];
}- (void)titleButtonOnClick:(UIButton *)button {// 1. 选中按钮[self selectingButton:button];// 2. 显示子视图[self addViewToContentScrollView:button];
}- (void)selectingButton:(UIButton *)button {[_selectedButton setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];_selectedButton.transform = CGAffineTransformMakeScale(1.0, 1.0);[button setTitleColor:[UIColor redColor] forState:UIControlStateNormal];button.transform = CGAffineTransformMakeScale(1.3, 1.3); // 选中字体变大，按钮变大，字体也跟着变大_selectedButton = button;// 选中按钮时要让选中的按钮居中CGFloat offsetX = button.frame.origin.x - ScreenWidth * 0.5;CGFloat maxOffsetX = self.titleScrollView.contentSize.width - ScreenWidth;if (offsetX < 0) {offsetX = 0;} else if (offsetX > maxOffsetX) {offsetX = maxOffsetX;}[self.titleScrollView setContentOffset:CGPointMake(offsetX, 0) animated:YES];
}- (void)addViewToContentScrollView:(UIButton *)button {NSInteger i = button.tag;UIViewController *childViewController = self.childViewControllers[i];CGFloat x = i * ScreenWidth;// 防止添加多次if (childViewController.view.subviews != nil) {childViewController.view.frame = CGRectMake(x, 0, ScreenWidth, ScreenHeight);[self.contentScrollView addSubview:childViewController.view];}self.contentScrollView.contentOffset = CGPointMake(x, 0);
}#pragma mark - UIScrollViewDelegate
- (void)scrollViewDidScroll:(UIScrollView *)scrollView {}// 滚动结束时，将对应的视图控制器的视图添加到内容滚动视图中
- (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView {NSInteger i = self.contentScrollView.contentOffset.x / ScreenWidth;[self addViewToContentScrollView:_buttons[i]];// 内容滚动视图结束后选中对应的标题按钮[self selectingButton:_buttons[i]];
}- (void)initChildViewControllers {// 0.头条TopLineViewController * topViewController = [[TopLineViewController alloc] init];topViewController.title = @"头条";[self addChildViewController:topViewController];// 1.科技TechnologyViewController * technologyViewController = [[TechnologyViewController alloc] init];technologyViewController.title = @"科技";[self addChildViewController:technologyViewController];// 2.汽车CarViewController * carViewController = [[CarViewController alloc] init];carViewController.title = @"汽车";[self addChildViewController:carViewController];// 3.体育SportsViewController * sportsViewController = [[SportsViewController alloc] init];sportsViewController.title = @"体育";[self addChildViewController:sportsViewController];// 4.视频VideoViewController * videoViewController = [[VideoViewController alloc] init];videoViewController.title = @"视频";[self addChildViewController:videoViewController];// 5.图片ImageViewController * imageViewController = [[ImageViewController alloc] init];imageViewController.title = @"图片";[self addChildViewController:imageViewController];// 6.热点HotViewController * hotViewController = [[HotViewController alloc] init];hotViewController.title = @"热点";[self addChildViewController:hotViewController];
}- (NSMutableArray *)buttons {if (_buttons == nil) {_buttons = [NSMutableArray array];}return _buttons;
}
@end

以上代码即可实现网易新闻滚动的导航条，因该功能可能在其它地方使用，所以最好可以将该功能抽出来，便于其它控制器集成，暂时还没做

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iOS滚动的导航条(仿网易新闻)

实现效果

实现代码

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