Ios 使用水平滚动在图像视图上加载图像

我正在通过字符串将图像加载到

UIImageView

上，我希望通过水平滚动查看

UIImageView

上的图像。 在我的xib文件中，我有一个滚动视图，上面有一个图像视图。我正在使用此代码，但我的页面没有滚动，只加载了字符串中的第一个图像。请任何人帮助

代码：

-（void）viewDidLoad
{
计数=1；
//imagesName=[[NSMutableArray alloc]initWithObjects:@“election_band_base.jpg”，“ElectionBoxAPPA Hindi（1.jpg）”，@“photos.png”，“business.png”，“health.png”，nil]；
imagesName1=[NSString stringWithFormat:@“election_band_base.jpg”，“ElectionBoxAPPA Hindi（1.jpg）”，@“photos.png”，“business.png”，“health.png”，nil]；
[imagesName添加对象：imagesName 1]；
items=[[NSMutableArray alloc]init]；
//[_imageView1.image setImage=imagesName1]；
[超级视图下载]；
//加载视图后，通常从nib执行任何其他设置。
//_imageView1.image=[UIImage animatedImageWithImages:imagesName持续时间：0]；
_imageView1.image=[UIImage ImageName:imagesName1]；
[自动加载滚动视图]；
}
-（void）加载滚动视图
{
scrollView.contentSize=CGSizeMake（0，scrollView.frame.size.height）；
NSMutableArray*控制器=[[NSMutableArray alloc]init]；
for（无符号i=0；i<[imagesName计数]；i++）{
[控制器添加对象：[NSNull]；
}
self.viewControllers=控制器；
计数=1；
//页面是滚动视图的宽度
scrollView.PaginEnabled=是；
scrollView.contentSize=CGSizeMake（scrollView.frame.size.width*[imagesName count]，scrollView.frame.size.height）；
//scrollView.contentSize=CGSizeMake（900,80）；
scrollView.showsHorizontalScrollIndicator=是；
scrollView.showsVerticalScrollIndicator=是；
scrollView.scrollsToTop=否；
scrollView.delegate=self；
pageControl.numberOfPages=[imagesName计数]；
pageControl.currentPage=0；
//页面是按需创建的
//加载可见页面
//在任意一侧加载页面，以避免用户开始滚动时闪烁
[带页面的自加载滚动视图：0]；
[带第1页的自动加载滚动视图]；
}
-（void）加载滚动视图带页面：（int）页面{
如果（第<0页）返回；
如果（第>=[图像名称计数]）
返回；
//如有必要，请替换占位符
控制器=[viewControllers objectAtIndex:page]；
如果（（NSNull*）控制器==[NSNull]）{
NSString*deviceType=[UIDevice currentDevice]。型号；
如果（[deviceType IsequalString:@“iPhone”]）
{
控制器=[[MyViewController alloc]initWithNibName:@“MyViewController”捆绑包：nil]；
}
否则{
控制器=[[MyViewController alloc]initWithNibName:@“MyViewController_ipad”捆绑包：nil]；
}
[控制器初始化与页码：第页]；
[控制器设置arrData:imagesName]；
[viewControllers replaceObjectAtIndex:page with Object:controller]；
}
//将控制器视图添加到滚动视图
if（nil==controller.view.superview）{
CGRect frame=scrollView.frame；
frame.origin.x=frame.size.width*页；
frame.origin.y=0；
controller.view.frame=frame；
[scrollView添加子视图：controller.view]；
}
}
-（void）unloadScrollViewWithPage:（int）第页{
如果（第<0页）返回；
如果（第>=[图像名称计数]）返回；
控制器=[viewControllers objectAtIndex:page]；
如果（（NSNull*）控制器！=[NSNull]）{
if（nil！=controller.view.superview）
[controller.view removeFromSuperview]；
[viewControllers replaceObjectAtIndex:page withObject:[NSNull]]；
}
}
-（无效）scrollViewDidScroll:（UIScrollView*）发送方{
//我们不希望UIPageControl和中的滚动委托之间出现“反馈循环”
//由用户点击页面控件生成的滚动事件触发的更新
//委托方法。当使用页控件时，我们使用布尔值禁用委托逻辑。
如果（已使用页面控制）{
//不执行任何操作-滚动是从页面控件启动的，而不是用户拖动的
返回；
}
//当上一页/下一页显示超过50%时，切换指示器
CGFloat pageWidth=scrollView.frame.size.width；
int page=floor（（scrollView.contentOffset.x-pageWidth/2）/pageWidth）+1；
pageControl.currentPage=页面；
//NSLog（@“当前页%d”，第页）；
//加载可见页面及其两侧的页面（以避免用户开始滚动时闪烁）
[self-unloadScrollViewWithPage:page-2]；
[带页面的自加载滚动视图：第1页]；
[带页面的自加载滚动视图：第页]；
[self-loadScrollViewWithPage:page+1]；
[self-UnloadScrollViewWith page:page+2]；
计数=页码+1；
//一种可能的优化方法是卸载不再可见的视图+控制器
}
//在滚动拖动开始时，重置滚动源自UIPageControl时使用的布尔值
-（无效）ScrollViewWillBeginDraging:（UIScrollView*）scrollViewLoc
{
CGFloat pageWidth=scrollViewLoc.frame.size。
-(void)viewDidLoad
    {
        count=1;
       // imagesName = [[NSMutableArray alloc]initWithObjects :@"election_band_base.jpg", @"ElectionBoxAPPA-Hindi(1).jpg", @"photos.png", @"business.png", @"health.png", nil];

         imagesName1 = [NSString stringWithFormat :@"election_band_base.jpg", @"ElectionBoxAPPA-Hindi(1).jpg", @"photos.png", @"business.png", @"health.png", nil];

        [imagesName addObject:imagesName1];

                items = [[NSMutableArray alloc]init];


        // [_imageView1.image setImage=imagesName1];

        [super viewDidLoad];
        // Do any additional setup after loading the view, typically from a nib.
       // _imageView1.image=[UIImage animatedImageWithImages:imagesName duration:0];

        _imageView1.image=[UIImage imageNamed:imagesName1 ];

        [self loadScrollView];

    }



        -(void)loadScrollView

        {

            scrollView.contentSize = CGSizeMake(0, scrollView.frame.size.height);



            NSMutableArray *controllers = [[NSMutableArray alloc] init];

            for (unsigned i = 0; i < [imagesName count]; i++) {

                [controllers addObject:[NSNull null]];

            }

            self.viewControllers = controllers;
            count=1;


            // a page is the width of the scroll view

            scrollView.pagingEnabled = YES;

            scrollView.contentSize = CGSizeMake(scrollView.frame.size.width * [imagesName count], scrollView.frame.size.height);
            //scrollView.contentSize = CGSizeMake(900,80);


            scrollView.showsHorizontalScrollIndicator =YES;

            scrollView.showsVerticalScrollIndicator = YES;

            scrollView.scrollsToTop = NO;

            scrollView.delegate = self;


            pageControl.numberOfPages = [imagesName count];

            pageControl.currentPage = 0;





            // pages are created on demand

            // load the visible page

            // load the page on either side to avoid flashes when the user starts scrolling

            [self loadScrollViewWithPage:0];

            [self loadScrollViewWithPage:1];

        }







       - (void)loadScrollViewWithPage:(int)page {

            if (page < 0) return;

            if (page >= [imagesName count])

                return;


            // replace the placeholder if necessary

            controller = [viewControllers objectAtIndex:page];

            if ((NSNull *)controller == [NSNull null]) {

                NSString *deviceType = [UIDevice currentDevice].model;

                if([deviceType isEqualToString:@"iPhone"])

                {

                    controller = [[MyViewController alloc] initWithNibName:@"MyViewController" bundle:nil];

                }

                else{

                    controller = [[MyViewController alloc] initWithNibName:@"MyViewController_ipad" bundle:nil];

                }

                [controller initWithPageNumber:page];

                [controller setArrData:imagesName];

                [viewControllers replaceObjectAtIndex:page withObject:controller];



            }


            // add the controller's view to the scroll view

            if (nil == controller.view.superview) {

                CGRect frame = scrollView.frame;

                frame.origin.x = frame.size.width * page;

                frame.origin.y = 0;

                controller.view.frame = frame;

                [scrollView addSubview:controller.view];

            }

        }

        - (void)unloadScrollViewWithPage:(int)page {

            if (page < 0) return;

            if (page >= [imagesName count]) return;



            controller = [viewControllers objectAtIndex:page];



            if ((NSNull *)controller != [NSNull null]) {

                if (nil != controller.view.superview)

                    [controller.view removeFromSuperview];



                [viewControllers replaceObjectAtIndex:page withObject:[NSNull null]];



            }

        }



        - (void)scrollViewDidScroll:(UIScrollView *)sender {

            // We don't want a "feedback loop" between the UIPageControl and the scroll delegate in

            // which a scroll event generated from the user hitting the page control triggers updates from

            // the delegate method. We use a boolean to disable the delegate logic when the page control is used.

            if (pageControlUsed) {

                // do nothing - the scroll was initiated from the page control, not the user dragging

                return;

            }


            // Switch the indicator when more than 50% of the previous/next page is visible

            CGFloat pageWidth = scrollView.frame.size.width;

            int page = floor((scrollView.contentOffset.x - pageWidth / 2) / pageWidth) + 1;

            pageControl.currentPage = page;

            //    NSLog(@"current page %d",page);


            // load the visible page and the page on either side of it (to avoid flashes when the user starts scrolling)

            [self unloadScrollViewWithPage:page - 2];

            [self loadScrollViewWithPage:page - 1];

            [self loadScrollViewWithPage:page];

            [self loadScrollViewWithPage:page + 1];

            [self unloadScrollViewWithPage:page + 2];

            count=page+1;




            // A possible optimization would be to unload the views+controllers which are no longer visible

        }



        // At the begin of scroll dragging, reset the boolean used when scrolls originate from the UIPageControl

        - (void)scrollViewWillBeginDragging:(UIScrollView *)scrollViewLoc

        {

            CGFloat pageWidth = scrollViewLoc.frame.size.width;

            CGPoint translation = [scrollViewLoc.panGestureRecognizer translationInView:scrollViewLoc.superview];

            int page = floor((scrollViewLoc.contentOffset.x - pageWidth / 2) / pageWidth) + 1;





                               }



        // At the end of scroll animation, reset the boolean used when scrolls originate from the UIPageControl

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

            pageControlUsed = NO;

        }

- (IBAction)changePage:(id)sender
{
    int page = pageControl.currentPage;


            // load the visible page and the page on either side of it (to avoid flashes when the user starts scrolling)

            [self loadScrollViewWithPage:page - 1];

            [self loadScrollViewWithPage:page];

            [self loadScrollViewWithPage:page + 1];



            // update the scroll view to the appropriate page

            CGRect frame = scrollView.frame;

            frame.origin.x = frame.size.width * page;

            frame.origin.y = 0;

            [scrollView scrollRectToVisible:frame animated:YES];



            // Set the boolean used when scrolls originate from the UIPageControl. See scrollViewDidScroll: above.

            pageControlUsed = YES;



        }

- (void)makeFriendsScrollView{
    int friendsCount = 10;
    float xPos = 10;
    for (int i = 0; i < friendsCount; i++) {


        UIImageView *imgView = [[UIImageView alloc] initWithFrame:CGRectMake(xPos,25 , 54, 54)];
        imgView.image = [UIImage imageNamed:@"user_default.png"];
        [imgView.layer setCornerRadius:27.0];
        imgView.clipsToBounds = YES;

        [scrollViewFriends addSubview:imgView];
        xPos = xPos + 64;

    }
    scrollViewFriends.contentSize = CGSizeMake(friendsCount*65, 90);
    [scrollViewFriends.layer setBorderColor:[UIColor lightGrayColor].CGColor];
    [scrollViewFriends.layer setBorderWidth:0.5f];
}

self.arraname=[NSArray arrayWithObjects:@"1.jpg",@"2.jpg",@"3.jpg", nil];
//    int friendsCount = 10;
    float xPos = 160;
    float x1=0;
    float y=60;
    for (int i = 0; i < [self.arraname count]; i++)
    {

         x1=xPos+(260*i);
        _imgView = [[UIImageView alloc] initWithFrame:CGRectMake(x1, y, 54, 54)];
        _imgView.image = [UIImage imageNamed:[self.arraname objectAtIndex:i]];
        [_imgView.layer setCornerRadius:27.0];
        _imgView.clipsToBounds = YES;

        [self.scroll addSubview:_imgView];

    }
    NSLog(@"%f",x1);
    self.scroll.contentSize=CGSizeMake(x1+200, 0);
    self.scroll.showsHorizontalScrollIndicator = YES;
    self.scroll.showsVerticalScrollIndicator=NO;
    self.scroll.pagingEnabled = YES;

ImageArray=[[NSMutableArray alloc]init];

for (int i=0; i<19; i++) {
   NSString *imgtext=[[NSString alloc]initWithFormat:@"img%d",i+1];
   [ImageArray addObject:imgtext];
}

for (int i = 0; i < ImageArray.count; i++) {
CGRect frame;
frame.origin.x = self.scrollview.frame.size.width * i;
frame.origin.y = 0;
frame.size = self.scrollview.frame.size;
UIView *subview = [[UIView alloc] initWithFrame:frame];

UIImage *image = [UIImage imageNamed: [NSString stringWithFormat:@"%@.png",[ImageArray objectAtIndex:i]]];
UIImageView *imageView = [[UIImageView alloc] initWithImage: image];
[imageView setFrame:CGRectMake(0, 0, frame.size.width,frame.size.height )];
[subview addSubview:imageView]; 
[self.scrollview addSubview:subview];
 }

self.scrollview.contentSize = CGSizeMake(self.scrollview.frame.size.width * ImageArray.count, self.scrollview.frame.size.height);

self.scrollview.contentOffset=CGPointMake (self.scrollview.frame.size.width, 0);