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具体内容如下
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
1.首先实现Main.storyboard
2.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
@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
@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 ()
@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
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本文名称：iOS如何实现仿网易新闻滚动导航条效果-创新互联
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