這篇文章主要為大家展示了“iOS如何實現仿網易新聞滾動導航條效果”,內容簡而易懂,條理清晰,希望能夠幫助大家解決疑惑,下面讓小編帶領大家一起研究并學習一下“iOS如何實現仿網易新聞滾動導航條效果”這篇文章吧。
具體內容如下
實現效果
效果:選擇不同的欄目,下面出現不同的視圖,欄目條可以滾動;下面的視圖也可以滾動,滾動時上面對應的欄目要選中顏色為紅色;
滾動的導航條包括兩部分:標題滾動視圖(UIScrollView),內容滾動視圖(UIScrollView)

實現代碼
1.首先實現Main.storyboard

2.創建多個子控制器:頭條、科技、汽車、體育、視頻、圖片、熱點
// 頭條ViewController, 其它控制器和這個控制器都一樣,只是背景顏色不同而已
#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實現Main.storyboard對應的視圖控制器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 = @"網易新聞";
// 1. 初始化標題滾動視圖上的按鈕
[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;
// 禁止額外滾動區域
self.automaticallyAdjustsScrollViewInsets = NO;
// 初始化時默認選中第一個
[self titleButtonOnClick:self.buttons[0]];
}
- (void)titleButtonOnClick:(UIButton *)button {
// 1. 選中按鈕
[self selectingButton:button];
// 2. 顯示子視圖
[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); // 選中字體變大,按鈕變大,字體也跟著變大
_selectedButton = button;
// 選中按鈕時要讓選中的按鈕居中
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 {
}
// 滾動結束時,將對應的視圖控制器的視圖添加到內容滾動視圖中
- (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView {
NSInteger i = self.contentScrollView.contentOffset.x / ScreenWidth;
[self addViewToContentScrollView:_buttons[i]];
// 內容滾動視圖結束后選中對應的標題按鈕
[self selectingButton:_buttons[i]];
}
- (void)initChildViewControllers {
// 0.頭條
TopLineViewController * topViewController = [[TopLineViewController alloc] init];
topViewController.title = @"頭條";
[self addChildViewController:topViewController];
// 1.科技
TechnologyViewController * technologyViewController = [[TechnologyViewController alloc] init];
technologyViewController.title = @"科技";
[self addChildViewController:technologyViewController];
// 2.汽車
CarViewController * carViewController = [[CarViewController alloc] init];
carViewController.title = @"汽車";
[self addChildViewController:carViewController];
// 3.體育
SportsViewController * sportsViewController = [[SportsViewController alloc] init];
sportsViewController.title = @"體育";
[self addChildViewController:sportsViewController];
// 4.視頻
VideoViewController * videoViewController = [[VideoViewController alloc] init];
videoViewController.title = @"視頻";
[self addChildViewController:videoViewController];
// 5.圖片
ImageViewController * imageViewController = [[ImageViewController alloc] init];
imageViewController.title = @"圖片";
[self addChildViewController:imageViewController];
// 6.熱點
HotViewController * hotViewController = [[HotViewController alloc] init];
hotViewController.title = @"熱點";
[self addChildViewController:hotViewController];
}
- (NSMutableArray *)buttons {
if (_buttons == nil) {
_buttons = [NSMutableArray array];
}
return _buttons;
}
@end以上是“iOS如何實現仿網易新聞滾動導航條效果”這篇文章的所有內容,感謝各位的閱讀!相信大家都有了一定的了解,希望分享的內容對大家有所幫助,如果還想學習更多知識,歡迎關注億速云行業資訊頻道!
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