UIPageControl

UIPageControl

import “MainViewController.h”

define WIDTH self.view.frame.size.width

define HEIGHT self.view.frame.size.height

@interface MainViewController ()
@property(nonatomic,retain)UIScrollView *scrollView;

@end

@implementation MainViewController

• (void)dealloc
  {
  [_scrollView release];
  [super dealloc];
  }

• (void)viewDidLoad {
  [super viewDidLoad];
  // Do any additional setup after loading the view.

  self.scrollView=[[UIScrollView alloc] initWithFrame:CGRectMake(0, 0,WIDTH ,HEIGHT )];
  self.scrollView.backgroundColor=[UIColor whiteColor];
  [self.view addSubview:self.scrollView];
  [self.scrollView release];

  self.scrollView.contentSize=CGSizeMake(WIDTH*7, HEIGHT);
  self.scrollView.pagingEnabled=YES;

  for (NSInteger i=1; i<8; i++) {
  NSString *picName=[NSString stringWithFormat:@”h%ld.jpg”,i];
  UIImageView *imageView=[[UIImageView alloc] initWithImage:[UIImage imageNamed:picName]];
  imageView.frame=CGRectMake(WIDTH*(i-1), 0, WIDTH, HEIGHT-37);
  [self.scrollView addSubview:imageView];
  [imageView release];
  }

  self.scrollView.contentOffset=CGPointMake(WIDTH*0, 0);
  self.scrollView.bounces=NO;
  self.scrollView.showsHorizontalScrollIndicator=NO;
  self.scrollView.showsVerticalScrollIndicator=NO;

  UIPageControl *pageControl=[[UIPageControl alloc] initWithFrame:CGRectMake(0,630,WIDTH,37)];
  pageControl.backgroundColor=[UIColor yellowColor];
  [self.view addSubview:pageControl];
  [pageControl release];

  // 图片的个数和点的个数相等
  pageControl.numberOfPages=7;
  // 点的背景颜色
  pageControl.pageIndicatorTintColor=[UIColor redColor];
  // 被选中的点的颜色
  pageControl.currentPageIndicatorTintColor=[UIColor blackColor];
  pageControl.currentPage=0;
  // 给它添加一个点击方法
  [pageControl addTarget:self action:@selector(pageControlAction:) forControlEvents:UIControlEventValueChanged];

  self.scrollView.delegate=self;

  pageControl.tag=1000;

  // scrollView的缩放
  // 缩放的比例
  // 最大的比例
  self.scrollView.maximumZoomScale=2;
  // 最小的比例
  self.scrollView.minimumZoomScale=0.5;
  // 原始的缩放比例
  self.scrollView.zoomScale=1;

}

pragma mark 专门用来缩放的协议方法

-(UIView )viewForZoomingInScrollView:(UIScrollView )scrollView{
return [scrollView.subviews firstObject];

}

-(void)pageControlAction:(UIPageControl *)pageControl{
// 点的个数从第0张开始
NSLog(@”%ld”,pageControl.currentPage);
// 触发事件,进行图片的切换
[self.scrollView setContentOffset:CGPointMake(pageControl.currentPage*WIDTH, 0) animated:YES];
}

-(void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView{
// 滑动图片,让圆点一起跟着动
UIPageControl pageControl=(UIPageControl )[self.view viewWithTag:1000];
pageControl.currentPage=self.scrollView.contentOffset.x/WIDTH;
}