如何在頁面控件的滾動視圖中將圖像應用於imageView。

Question

我有一個imageView在scrollView中使用頁面控件現在我想顯示不同的圖像到同一個imageView。頁面滾動視圖控制滾動automatically.It顯示第一個圖像，但不顯示我已經使用了其他images.The代碼如下：

// ----------------------------------------------------------------------------- 
// loadScrollViewWithPage 

- (void)loadScrollViewWithPage:(int)page 
{ 
    if (page < 0) return; 
    if (page >= kNumberOfPages) return; 
} 

// ----------------------------------------------------------------------------- 
// scrollViewDidScroll 

- (void)scrollViewDidScroll:(UIScrollView *)sender 
{ 
    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 = mScrollView.frame.size.width; 
    int page = floor((mScrollView.contentOffset.x - pageWidth/2)/pageWidth) + 1; 
    mPageControl.currentPage = page; 

    // 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]; 
} 

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

- (void)scrollViewWillBeginDragging:(UIScrollView *)scrollView 
{ 
    pageControlUsed = NO; 
    [mTimer invalidate]; 
} 

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

- (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView 
{ 
    pageControlUsed = NO; 
} 

- (id)initWithNibName:(NSString *)nibNameOrNil 
       bundle:(NSBundle *)nibBundleOrNil 
        tag:(NSInteger)inTag 
      noOfPoses:(NSInteger)inNoOfPoses 
      imageName:(NSArray *)inImageNameArr 
{ 
    self = [super initWithNibName:@"TIphonePosesDetailView" bundle:nibBundleOrNil]; 
    if (self) 
    { 
     mTag = inTag;// tag of the image taken from previous controller 
     mNoOfPoses = inNoOfPoses; 
     kNumberOfPages = mNoOfPoses; 
     if (inImageNameArr != nil) 
     { 
      mImgNameArr = [inImageNameArr retain];// contains images 
     } 
     NSLog(@"Image Array%@",mImgNameArr); 

    } 
    return self; 
} 

// ----------------------------------------------------------------------------- 
// viewDidLoad 

- (void)viewDidLoad 
{ 
    [super viewDidLoad]; 

    mScrollView.delegate = self; 
    mScrollView.showsHorizontalScrollIndicator = FALSE; 
    [mScrollView setContentSize:CGSizeMake(1000, 464)]; 
    [mScrollView setFrame:CGRectMake(45, 69, 240, 226)]; 

    // Setting frame 
    mStartPoint = CGPointMake(0, 0); 
    [mPrevImgView setImage:[self getImageFromName:[mImgNameArr objectAtIndex:mTag]]]; 
    [mPrevImgView setFrame:CGRectMake(mStartPoint.x, mStartPoint.y, 240, 226)]; 

    // a page is the width of the scroll view 
    mScrollView.pagingEnabled = YES; 
    mScrollView.contentSize = CGSizeMake(mScrollView.frame.size.width * kNumberOfPages, mScrollView.frame.size.height); 
    mScrollView.showsHorizontalScrollIndicator = NO; 
    mScrollView.showsVerticalScrollIndicator = NO; 
    mScrollView.scrollsToTop = NO; 
    mPageControl.numberOfPages = kNumberOfPages; 
    mPageControl.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]; 
    mTimer = [[NSTimer alloc] initWithFireDate:[NSDate dateWithTimeIntervalSinceNow:2] interval:2.0 target:self selector:@selector(scrollAutomatically:) userInfo:nil repeats:YES]; 
    [[NSRunLoop currentRunLoop] addTimer:mTimer forMode:NSDefaultRunLoopMode]; 
} 

// ----------------------------------------------------------------------------- 
// scrollAutomatically 

- (void)scrollAutomatically:(id)sender 
{ 
    if (mCurrentPage < [mPageControl numberOfPages]) 
    { 
     mCurrentPage ++; 
     mTag ++; 
     [mPrevImgView setImage:[self getImageFromName:[mImgNameArr objectAtIndex:mTag]]]; 
     mStartPoint.x += 250 + mPrevImgView.frame.size.width; 
    } 
    else 
    { 
     mCurrentPage = 0; 
    } 

    [self loadScrollViewWithPage:mCurrentPage - 1]; 
    [self loadScrollViewWithPage:mCurrentPage]; 
    [self loadScrollViewWithPage:mCurrentPage + 1]; 

    // update the scroll view to the appropriate page 
    CGRect frame = mScrollView.frame; 
    frame.origin.x = frame.size.width * mCurrentPage; 
    frame.origin.y = 0; 
    [mScrollView scrollRectToVisible:frame animated:YES]; 
} 

Answer 1

http://developer.apple.com/library/ios/#samplecode/PageControl/Introduction/Intro.html#//apple_ref/doc/uid/DTS40007795

此鏈接可能幫助你。

代替該函數調用此的：

+（的UIImage *）pageControlColorWithIndex：（NSUInteger）指數
{ }

使用此方法

+（ UIImage *）pageControlImageWithIndex：（NSUInteger）index
{
如果（__pageControlColorList ==無）
{
__pageControlColorList = [[NSArray中的alloc] initWithObjects：[UIImage的> imageNamed：@ 「1.png」]，[UIImage的imageNamed：@ 「2.png」]，[UIImage的imageNamed：@「3.png」]， [UIImage imageNamed：@「4.png」]，[UIImage imageNamed：@「5.png」]，[UIImage> imageNamed：@「6.png」]，[UIImage imageNamed：@「7.png」]，nil];
}

返回[_ pageControlColorList objectAtIndex：指數％[ _pageControlColorList計數]]; }

並在MyViewController類中添加UIScrollView對象。並在ViewDidLoad調用這個

mImage.image = [MyViewController pageControlImageWithIndex：pageNumber];

Answer 2

當你調用此方法加載的所有圖像，通過固定的座標動態。你可以使用緩存加載，這將節省時間加載圖像和可用here

- (void)loadScrollViewWithPage:(int)page 
{ 
    if (page < 0) return; 
    if (page >= kNumberOfPages) return; 
} 

，但只顯示當視圖被加載

之後滾動型的委託方法將你的移動網頁控制工作的第一頁....

但呼籲停止對這些

[self loadScrollViewWithPage:page - 1]; 
    [self loadScrollViewWithPage:page]; 
    [self loadScrollViewWithPage:page + 1]; 

它會創建影像反覆