import "ViewController.h"

@interface ViewController ()<UIScrollViewDelegate>

{
NSTimer *_timer;
BOOL isAdd;
}

@property (nonatomic, strong) UIScrollView *scrollView;
@property (nonatomic, strong) NSMutableArray *advsList;
@property (nonatomic, strong) UIPageControl *pagePoint;

@end

/**

• 屏幕宽度
  */

define SCREEN_WIDTH ([UIScreen mainScreen].bounds.size.width)

/**

• 屏幕高度
  */

define SCREEN_HEIGHT ([UIScreen mainScreen].bounds.size.height)

@implementation ViewController

• (void)viewDidLoad {
  [super viewDidLoad];

  [self addView];
  [self showAdvs];
  [self addNSTimer];

}

pragma mark -创建图片数组

• (NSMutableArray *)advsList
  {
  if(_advsList == nil){
  _advsList = [NSMutableArray array];
  }
  return _advsList;
  }

pragma mark -添加控件

• (void)addView{

  //添加图片
  for (int i = 1; i < 5; i++) {
  [self.advsList addObject:[NSString stringWithFormat:@"%d",i]];
  }
  self.view.backgroundColor = [UIColor whiteColor];

  //添加滑动视图
  self.scrollView = [[UIScrollView alloc]initWithFrame:CGRectMake(0, 100, self.view.frame.size.width, 150)];
  //设置代理这个必须的
  self.scrollView.delegate = self;
  //设置总大小也就是里面容纳的大小
  self.scrollView.contentSize = CGSizeMake(self.view.frame.size.width * self.advsList.count,self.scrollView.frame.size.height);
  [self.scrollView setBackgroundColor:[UIColor blackColor]];
  //里面的子视图跟随父视图改变大小
  [self.scrollView setAutoresizesSubviews:YES];
  //设置分页形式，这个必须设置
  [self.scrollView setPagingEnabled:YES];
  //隐藏横竖滑动块
  [self.scrollView setShowsVerticalScrollIndicator:NO];
  [self.scrollView setShowsHorizontalScrollIndicator:NO];
  [self.view addSubview:self.scrollView];
  //场景UIPageControl显示控件，并修改小点颜色
  self.pagePoint = [[UIPageControl alloc]init];
  self.pagePoint.currentPageIndicatorTintColor = [UIColor blackColor];
  self.pagePoint.pageIndicatorTintColor = [UIColor grayColor];
  self.pagePoint.frame = CGRectMake(self.view.frame.size.width - self.pagePoint.bounds.size.width-self.advsList.count*10, self.scrollView.frame.origin.y+135, self.pagePoint.bounds.size.width, self.pagePoint.bounds.size.height);
  [self.pagePoint setNumberOfPages:[self.advsList count]];
  [self.view addSubview:self.pagePoint];

}

pragma mark -展示广告位,初始化

• (void)showAdvs{

  isAdd = true;
  for (UIView *view in [self.scrollView subviews]){
  [view removeFromSuperview];
  }
  for(int i = 0; i < [self.advsList count]; i ++){
  UIButton *thumbView = [[UIButton alloc] init];
  [thumbView addTarget:self
  action:@selector(myDidSelectAdvAtIndex:)
  forControlEvents:UIControlEventTouchUpInside];
  thumbView.tag = i;
  thumbView.frame = CGRectMake(self.view.frame.size.width * i, 0, self.view.frame.size.width, 150);
  [thumbView setBackgroundImage:[UIImage imageNamed:self.advsList[i]] forState:UIControlStateNormal];
  thumbView.adjustsImageWhenHighlighted = NO;
  [self.scrollView addSubview:thumbView];
  }
  }

pragma mark -添加定时器

• (void)addNSTimer
  {
  NSTimer *timer = [NSTimer scheduledTimerWithTimeInterval:2 target:self selector:@selector(nextPage) userInfo:nil repeats:YES];
  //添加到runloop中
  [[NSRunLoop mainRunLoop]addTimer:timer forMode:NSRunLoopCommonModes];
  _timer = timer;
  }

pragma mark -删除定时器

• (void)removeNSTimer
  {
  [ _timer invalidate];
  _timer =nil;
  }

pragma mark -定时器下一页

• (void)nextPage{
  NSInteger num = self.pagePoint.currentPage;
  if(isAdd){
  num++;
  if(num == self.advsList.count -1){
  isAdd = false;
  }
  }else{
  num--;
  if(num == 0){
  isAdd = true;
  }
  }
  [self scrollToIndex:num];
  }

pragma mark -滑动的距离

• (void)scrollToIndex:(NSInteger)index
  {

  CGRect frame = self.scrollView.frame;
  frame.origin.x = frame.size.width * index;
  frame.origin.y = 0;
  [self.scrollView scrollRectToVisible:frame animated:YES];
  }

pragma mark -滑动完成时计算滑动到第几页

• (void)scrollViewDidScroll:(UIScrollView *)scrollView
  {

  CGFloat pageWidth = scrollView.frame.size.width;
  int page = floor((scrollView.contentOffset.x - pageWidth / 2) /pageWidth) +1;
  [self.pagePoint setCurrentPage:page];
  }

pragma mark -当用户开始拖拽的时候就调用移除计时器

• (void)scrollViewWillBeginDragging:(UIScrollView *)scrollView
  {
  [self removeNSTimer];
  }

pragma mark -当用户停止拖拽的时候调用添加定时器

• (void)scrollViewDidEndDragging:(UIScrollView *)scrollView willDecelerate:(BOOL)decelerate
  {
  [self addNSTimer];
  }

pragma mark -点击广告

• (void)myDidSelectAdvAtIndex:(id) index
  {
  UIButton *thumbView = (UIButton *)index;
  NSLog(@"你点击了第个%ld广告",thumbView.tag);
  }

• (void)didReceiveMemoryWarning {
  [super didReceiveMemoryWarning];
  // Dispose of any resources that can be recreated.
  }

@end