Question

下一个按钮仅适用于2个图像我在阵列中有10个图像后，两个图像不向前移动前一个按钮适用于所有图像，但下一个按钮只能处理一个和第二个图像下面是下一个按钮代码

       - (IBAction)  nextButtonAction {

    if ( self.scrollView.contentOffset.x <= self.scrollView.frame.size.width ) {
    CGRect frame;
    frame.origin.x = self.scrollView.contentOffset.x +self.scrollView.frame.size.width;
    frame.origin.y = 0;
     frame.size = self.scrollView.frame.size;
     [self.scrollView scrollRectToVisible:frame animated:YES];
    pageControlBeingUsed = YES;
       }

     }


 // Here is the previous button code


      -(IBAction)previousButtonAction
    {


    if ( self.scrollView.contentOffset.x >= self.scrollView.frame.size.width ) {
    CGRect frame;
    frame.origin.x = self.scrollView.contentOffset.x -self.scrollView.frame.size.width;
    frame.origin.y = 0;
    frame.size = self.scrollView.frame.size;
    [self.scrollView scrollRectToVisible:frame animated:YES];
    pageControlBeingUsed = YES;
   } 
   }

将图像添加到数据库

     -(IBAction)addToCollectionButtonAction{




      GeoNewsAppDelegate *appDelegate = (GeoNewsAppDelegate *)[[UIApplication   sharedApplication] delegate];

   // Create a Coffee Object.
    Coffee *coffeeObj = [[Coffee alloc] initWithPrimaryKey:0];

    int pageNumber  = [pageControl currentPage]; 
   NSLog(collectionImage);


   RowTwo*aRowTwo=[appDelegate.articles objectAtIndex:pageNumber];




    NSString*thumb2=aRowTwo.image;

    coffeeObj.thumb = thumb2;
   coffeeObj.path = thumb2; 





         [appDelegate addCoffee:coffeeObj];



      }

Answer 1

将self.scrollView.frame.size.width替换为self.scrollView.contentSize.width

    - (IBAction)  nextButtonAction {

    if ( self.scrollView.contentOffset.x <= self.scrollView.contentSize.width ) {
    CGRect frame;
    frame.origin.x = self.scrollView.contentOffset.x +self.scrollView.frame.size.width;
    frame.origin.y = 0;
     frame.size = self.scrollView.frame.size;
     [self.scrollView scrollRectToVisible:frame animated:YES];
    pageControlBeingUsed = YES;
       }

     }


 // Here is the previous button code


      -(IBAction)previousButtonAction
    {


    if ( self.scrollView.contentOffset.x >= self.scrollView.frame.size.width ) {
    CGRect frame;
    frame.origin.x = self.scrollView.contentOffset.x -self.scrollView.frame.size.width;
    frame.origin.y = 0;
    frame.size = self.scrollView.frame.size;
    [self.scrollView scrollRectToVisible:frame animated:YES];
    pageControlBeingUsed = YES;
   } 
   }

Answer 2

- (IBAction)  nextButtonAction {

    if ( self.scrollView.contentOffset.x < (self.scrollView.frame.size.width*10) ) {
        CGRect frame;
        frame.origin.x = self.scrollView.contentOffset.x +self.scrollView.frame.size.width;
        frame.origin.y = 0;
        frame.size = self.scrollView.frame.size;
        [self.scrollView scrollRectToVisible:frame animated:YES];
        pageControlBeingUsed = YES;
    }

}

UIScrollView下一个上一个按钮

2 个答案: