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- 网易新闻的头部点击切换不同界面主要运用到了iOS中父子控制器知识点。
//ViewController.m
//01-MG新闻
//
//Created by ming on 15/12/13.
//Copyright ? 2015年 ming. All rights reserved.#import "ViewController.h"
#import "HotViewController.h"
#import "ReaderVeiwController.h"
#import "ScienceVeiwController.h"
#import "SocietyVeiwController.h"
#import "TopVeiwController.h"
#import "VideoVeiwController.h"#define screenW [UIScreen mainScreen].bounds.size.width
#define screenH [UIScreen mainScreen].bounds.size.height@interface ViewController ()
/** titleScrollView */
@property (nonatomic,weak) UIScrollView *titleScrollView;
/** contentScrollView */
@property (nonatomic,weak) UIScrollView *contentScrollView;
/** 按钮数组 */
@property (nonatomic,strong) NSMutableArray *titleButtons;
/** 选中按钮 */
@property (nonatomic,weak) UIButton *seltitleButton;
@end#pragma mark ========= 常量 ============
CGFloat const LYMNavHeight = 64;
CGFloat const titleScrollViewH = 44;
static CGFloat const maxTitleScale = 1.35;
@implementation ViewController
#pragma mark ========= 懒加载 ============
- (NSMutableArray *)titleButtons{
if (!_titleButtons) {
_titleButtons = [NSMutableArray array];
}
return _titleButtons;
}- (void)viewDidLoad {
[super viewDidLoad];
self.title = @"MG新闻";
// 不需要额外的滚动区域
self.automaticallyAdjustsScrollViewInsets = NO;
// 1.初始化标题TitleScrollView
[self setUPTittelscrollView];
// 2.初始化标题ContentlscrollView
[self setUPContentlscrollView];
// 3.初始化所有的子控制器
[self setUPAllChildViewController];
// 4.添加所有标题按钮
[self setupAllTitleButton];
}#pragma mark ========= 初始化标题TitleScrollView ============
// 1.初始化标题TitleScrollView
- (void)setUPTittelscrollView{
UIScrollView *titleScrollView = [[UIScrollView alloc] init];
CGRect frame = titleScrollView.frame;
frame.origin.y = LYMNavHeight;
frame.size.width = screenW;
frame.size.height = titleScrollViewH;
titleScrollView.frame = frame;
titleScrollView.showsHorizontalScrollIndicator = NO;
[self.view addSubview:titleScrollView];
self.titleScrollView = titleScrollView;
titleScrollView.backgroundColor = [UIColor grayColor];
}// 添加所有标题按钮
- (void)setupAllTitleButton{
CGFloat buttonW = 100;
CGFloat buttonH = titleScrollViewH;
CGFloat buttonX = 0;
CGFloat buttonY = 0;
NSInteger count = self.childViewControllers.count;
for (int i = 0;
i 红色 R:0 -> 1
// 红色 -> 黑色 R:1 -> 0
UIColor *leftColor = [UIColor colorWithRed:scaleL green:0 blue:0 alpha:1];
UIColor *rightColor = [UIColor colorWithRed:0 green:scaleR blue:0 alpha:1];
// 3.1 让左边按钮的颜色
[leftButton setTitleColor:leftColor forState:UIControlStateNormal];
// 3.2 让左边按钮的颜色
[rightButton setTitleColor:rightColor forState:UIControlStateNormal];
}#pragma mark ========= 让选中按钮居中显示的方法 ============
- (void)setselButtonOnCenter:(UIButton *)btn{
CGFloat offsetX = btn.center.x - 0.5 * screenW;
if (offsetX < 0) {
offsetX = 0;
}
CGFloat maxOffsetX = self.titleScrollView.contentSize.width - screenW;
if (offsetX > maxOffsetX) {
offsetX = maxOffsetX;
}[self.titleScrollView setContentOffset:CGPointMake(offsetX, 0) animated:YES];
}#pragma mark ========= 初始化所有的子控制器 ============
// 3.初始化所有的子控制器
- (void)setUPAllChildViewController{
// 头条
TopVeiwController *toptVC = [[TopVeiwController alloc] init];
toptVC.title = @"头条";
[self addChildViewController:toptVC];
// 热点
HotViewController *hotVC = [[HotViewController alloc] init];
hotVC.title = @"热点";
[self addChildViewController:hotVC];
// 视频
VideoVeiwController *videoVC = [[VideoVeiwController alloc] init];
videoVC.title = @"视频";
[self addChildViewController:videoVC];
// 社会
SocietyVeiwController *scoietyVC = [[SocietyVeiwController alloc] init];
scoietyVC.title = @"社会";
[self addChildViewController:scoietyVC];
// 订阅
ReaderVeiwController *readerVC = [[ReaderVeiwController alloc] init];
readerVC.title = @"订阅";
[self addChildViewController:readerVC];
// 科技
ScienceVeiwController *scienceVC = [[ScienceVeiwController alloc] init];
scienceVC.title = @"科技";
[self addChildViewController:scienceVC];
}@end```- ###效果：由于制作GIF比较麻烦，于是网上找了一个类似的效果图在(注：本文代码默认选中的titleButton会居中显示)，如下：
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