UIScrollView -------- 实现简单的相册功能

转自出处：UIScrollView -------- 实现简单的相册功能

@在MRC环境下:释放宏    #define RELEASE_SAFELY(__Pointer) do{[__Pointer release],__Pointer = nil;} while(0)

@思路:1个大的UIScrollView上嵌套N个小的UIScrollView ,小的UIScrollView实现缩放,大的UIScrollView实现滚动查看

1.定义一个HMTMyScrollView,继承自UIScrollView,用它来绘制放置图片UIImageView的小UIScrollView

 #import <UIKit/UIKit.h>

 @interface HMTMyScrollView : UIScrollView <UIScrollViewDelegate>

 @property (nonatomic,retain)UIImageView * imageView;

 @end

 #import "HMTMyScrollView.h"

 @implementation HMTMyScrollView


 -(void)dealloc{

     RELEASE_SAFELY(_imageView);
     [super dealloc];

 }

 - (id)initWithFrame:(CGRect)frame
 {
     self = [super initWithFrame:frame];
     if (self) {
         // Initialization code

         // 缩放最大的比例
         self.maximumZoomScale = 3.0;
         // 缩放最小的比例
         self.minimumZoomScale = 0.2;

         _imageView = [[UIImageView alloc]initWithFrame:[self bounds]];
         [self addSubview:_imageView];

         self.delegate = self;

     }
     return self;
 }

 - (UIView *)viewForZoomingInScrollView:(UIScrollView *)scrollView{

     return _imageView;
 }
 @end

2.具体实现:

 #import "HMTRootViewController.h"
 #import "HMTMyScrollView.h"

 #define HEIGHT   548
 #define WIDTH    320
 #define TAG      100

 @interface HMTRootViewController (){

     NSInteger _previousPage;
 }

 @property (nonatomic,retain)UIPageControl * pageControl;
 @property (nonatomic,retain)UIScrollView  * headScroll;

 @end

 @implementation HMTRootViewController

 - (void)dealloc{

     RELEASE_SAFELY(_pageControl);
     RELEASE_SAFELY(_headScroll);
     [super dealloc];

 }

 - (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
 {
     self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
     if (self) {
         // Custom initialization
         _previousPage = 0;

     }
     return self;
 }

 - (void)viewDidLoad
 {
     [super viewDidLoad];
     // Do any additional setup after loading the view.
     [self realizePhotoAlbun];
 }

 - (void)realizePhotoAlbun{

     self.headScroll = [[UIScrollView alloc]initWithFrame:CGRectMake(0, 0, WIDTH, HEIGHT)];
     _headScroll.backgroundColor = [UIColor grayColor];
     _headScroll.contentSize = CGSizeMake(WIDTH * 8, HEIGHT);
     _headScroll.bounces = NO;
     _headScroll.delegate = self;
     _headScroll.pagingEnabled = YES;
     _headScroll.showsHorizontalScrollIndicator = NO;
     [self.view addSubview:_headScroll];
     [_headScroll release];

     NSArray * arrayImage = @[@"h1.jpeg",@"h2.jpeg",@"h3.jpeg",@"h4.jpeg",@"h5.jpeg",@"h6.jpeg",@"h7.jpeg",@"h8.jpeg"];
     for (int i = 0; i < [arrayImage count]; i++) {

         HMTMyScrollView * photoScrollView = [[HMTMyScrollView alloc]initWithFrame:CGRectMake(WIDTH * i,0, WIDTH, HEIGHT)];
         photoScrollView.imageView.image = [UIImage imageNamed:[arrayImage objectAtIndex:i]];
         photoScrollView.tag = TAG + i;
         [_headScroll addSubview:photoScrollView];
         [photoScrollView release];
     }

     self.pageControl = [[UIPageControl alloc]initWithFrame:CGRectMake(100, 518, 120, 40)];
     _pageControl.numberOfPages = 8;
     _pageControl.currentPageIndicatorTintColor = [UIColor purpleColor];
     _pageControl.pageIndicatorTintColor = [UIColor blackColor];
     [_pageControl addTarget:self action:@selector(controlPageControl:) forControlEvents:UIControlEventValueChanged];
     [self.view addSubview:_pageControl];
     [_pageControl release];

 }

 - (void)controlPageControl:(UIPageControl *)pageControl{

     // 点击UIPageControl,翻页产生动画效果
     [self.headScroll setContentOffset:CGPointMake(pageControl.currentPage * WIDTH, 0) animated:YES];
 }

 - (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView{

     NSInteger nowPage = scrollView.contentOffset.x / WIDTH;
     self.pageControl.currentPage = nowPage;
     HMTMyScrollView * myScrollView = (HMTMyScrollView *)[self.headScroll viewWithTag:_previousPage + TAG];

     if (myScrollView.zoomScale != 1 && nowPage != _previousPage) {
         myScrollView.zoomScale = 1;
     }

     _previousPage = nowPage;
     NSLog(@"%s",__FUNCTION__);

 }

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




 @end

@自动循环滚动效果

[NSTimer scheduledTimerWithTimeInterval:2 target:self selector:@selector(scrollTimer) userInfo:nil repeats:YES];

//设置滚动
-(void)scrollTimer{   
    timerCount++;
    if (timerCount >= 4) {
        timerCount=0;
    }
    [adView setContentOffset:CGPointMake(tableWidth * timerCount, 0)animated:YES];
    [pageControl setCurrentPage:timerCount];
}