滚动

AppDelegate.m

import "ViewController.h"

import "NewsViewController.h"

// 获取NSUserDefaults单例对象
NSUserDefaults *theUser=[NSUserDefaults standardUserDefaults];

// 通过单例对象获取key：isOpened的value值
BOOL isOpend=[theUser boolForKey:@"isOpened"];
if (isOpend == YES) {
     // 直接进入到主页面或者登陆页面
  
    NewsViewController *theNvct=[[NewsViewController alloc]init];
    self.window.rootViewController=theNvct;
    
}else
{
    // 直接进入到主页面或者登陆页面(体验页面)


   
    
    ViewController *theView=[[ViewController alloc]init];
    self.window.rootViewController=theView;
    
    // 通过通过单例对象对key：isOpened赋值为YES
    [theUser setBool:YES forKey:@"isOpened"];
}

//#import "ViewController.m"

import "NewsViewController.h"

import "AppDelegate.h"

@interface ViewController ()
{
//创建滚动控件
UIScrollView *theScroll;

//创建数组
NSArray *theArray;

//分页控件
UIPageControl *thePage;

//添加计数器(用来实现页面的自动滚动)
NSTimer *theTimer;


//创建整形类(更方便判断滚动的页面)
NSInteger timerPage;

}

@end

@implementation ViewController

• (void)viewDidLoad {
  [super viewDidLoad];

//获取页面宽度个高度
float width=self.view.frame.size.width;
float hight=self.view.frame.size.height;

//初始化滚动控件
theScroll=[[UIScrollView alloc]initWithFrame:CGRectMake(0, 0, width, hight)];

//获取X轴
float X=0.0;

for (int i=0; i<4; i++) {
    //给滚动视图添加图片  0     0
    //                 375   0
    //                 375*2 0
    //                 375*3 0
    
//给图片添加成背景图
    UIImageView *theImage=[[UIImageView alloc]initWithFrame:CGRectMake(X, 0, width, hight)];
    
//将4张图片用数组形式存入数据中
    theArray=@[[UIImage imageNamed:@"1.jpg"],[UIImage  imageNamed:@"2.jpg"],[UIImage imageNamed:@"3.jpg"],[UIImage imageNamed:@"4.jpg"]];
    
 
    //将图片与数据进行绑定
    theImage.image=theArray[i];
    
    //将图片添加到滚动视图上
    [theScroll addSubview:theImage];
    //每张图片都要变化宽度变
    X +=width;
    
   
}



//设置滚动视图总共的大小（总共宽度）
theScroll.contentSize=CGSizeMake(width*4, hight);

//滚动视图是否按页跳转
theScroll.pagingEnabled=YES;

//隐藏滚动条
theScroll.showsHorizontalScrollIndicator=NO;  //水平

// theScroll.showsVerticalScrollIndicator=NO 垂直

theScroll.delegate=self;

//初始化页码
thePage=[[UIPageControl alloc]initWithFrame:CGRectMake(width/2-50, 570, 100, 30)];

//设置页码个数
thePage.numberOfPages=4;

//设置页码初始页
thePage.currentPage=0;


//设置页码颜色
thePage.pageIndicatorTintColor=[UIColor blueColor];

//设置当前页码颜色
thePage.currentPageIndicatorTintColor=[UIColor yellowColor];

//把滚动控件添加到视图上
[self.view addSubview:theScroll];

//把分页控件添加到视图上
[self.view addSubview:thePage];

//给计时器添加方法
theTimer=[NSTimer scheduledTimerWithTimeInterval:2 target:self selector:@selector(scrollChange) userInfo:nil repeats:YES];






// Do any additional setup after loading the view, typically from a nib.

}
//设置计时器方法
-(void)scrollChange
{
timerPage++;
if (timerPage >= theArray.count-1) {

    //销毁定时器
    [theTimer invalidate];
}

// //点的大小 为了把点 放到中间
[theScroll setContentOffset:CGPointMake(timerPage*theScroll.frame.size.width, 0) animated:YES];

}

//遵守两个协议方法
//表示在滑动滚动视图的时候调用此方法

• (void)scrollViewDidScroll:(UIScrollView *)scrollView
  {
  CGPoint point=scrollView.contentOffset;//偏移量
  //当前点的第几张图片
  thePage.currentPage=point.x/scrollView.frame.size.width;

  if (thePage.currentPage == theArray.count-1) {
  //创建一个按钮
  UIButton *theButton=[UIButton buttonWithType:UIButtonTypeRoundedRect];
  theButton.frame=CGRectMake(180, 500, 100, 30);

    [theButton setTitle:@"立即体验" forState:UIControlStateNormal];
    [theButton setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];
    theButton.backgroundColor=[UIColor redColor];
    [theButton addTarget:self action:@selector(NextNewPageChange) forControlEvents:UIControlEventTouchUpInside];
   
    //把按钮添加到滚动视图上
     [self.view addSubview:theButton];
  

  }

}
//设置方法跳转下一页面
-(void)NextNewPageChange
{
NewsViewController *theNew=[[NewsViewController alloc]init];

AppDelegate *app=(AppDelegate*)[UIApplication sharedApplication].delegate;
app.window.rootViewController=theNew;

}
//实现页码和滚动视图的关联

• (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView
  {
  //当前页 把滚动的页数与滚动控件进行关联
  thePage.currentPage=theScroll.contentOffset.x/self.view.frame.size.width;

}

//跳转页面