Question

您好我的应用程序中我想在UIScrollView中的每个图像上显示不同的标签文本。这是我的代码。

for (int i=0; i<imageArray.count; i++)
{
    NSString *str = [imageArray objectAtIndex:i];
    NSString *bannerImageURL = [NSString stringWithFormat:@"http://url.com", str];
    CGFloat myOrigin = i * self.view.frame.size.width;

 UIImageView *myImageView = [[UIImageView alloc] initWithFrame:CGRectMake(myOrigin, 0, self.view.frame.size.width,imgScrollView.frame.size.height)];
    myImageView.contentMode = UIViewContentModeScaleToFill;
    myImageView.image = [UIImage imageWithData:[NSData dataWithContentsOfURL:[NSURL URLWithString:bannerImageURL]]];
 imgScrollView.contentSize = CGSizeMake(self.view.frame.size.width * imageArray.count,                                      self.view.frame.size.height);

CGPoint scrollPoint = CGPointMake(0, 0);
[imgScrollView setContentOffset:scrollPoint animated:YES];
imgScrollView.delegate = self;
[imgScrollView addSubview:myImageView];
}

这是我的代表方法。

- (void)scrollViewDidScroll:(UIScrollView *)scrollView
 {
  [imgScrollView setContentOffset: CGPointMake(imgScrollView.contentOffset.x,0)];
 }
- (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView
{
CGFloat pageWidth = scrollView.frame.size.width;
int page = floor((scrollView.contentOffset.x - pageWidth / 2) / pageWidth) + 1;
NSLog(@"Scrolling - You are now on page %i",page);
}

我想将数组传递给该标签，还有一件事如何将页面控制器添加到此代码中？请帮助。

Answer 1

我不确定你在上述问题中指的是什么标签。我假设您的标头中定义了标签UILabel * _label和数组NSArray * _namesArray。

我试图稍微清理你的代码。试试这个：

for(int index = 0; index < [imageArray count]; index++){
  NSString * string = [imageArray objectAtIndex:index];
  NSString * bannerImageURL = [NSString stringWithFormat:@"http://url.com/%@", string]; // You weren't using the string in your formatter, so I added it to the end.
  CGFloat myOrigin = index * self.view.frame.size.width;

  UIImageView * myImageView = [[UIImageView alloc] initWithFrame:CGRectMake(myOrigin, 0.0f, self.view.frame.size.width, imageScrollView.frame.size.height)];
  myImageView.contentMode = UIViewContentModeScaleToFill;
  myImageView.image = [UIImage imageWithData:[NSData dataWithContentsOfURL:[NSURL URLWithString:bannerImageURL]]];
  [imageScrollView addSubview:myImageView];
}
imageScrollView.contentSize = CGSizeMake(self.view.frame.size.width * imageArray.count,                                      self.view.frame.size.height);
[imageScrollView setContentOffset:CGPointZero animated:YES];
imageScrollView.delegate = self;

然后对于委托方法，您将尝试：

- (void)scrollViewDidScroll:(UIScrollView *)scrollView; {
  CGFloat pageWidth = scrollView.frame.size.width;
  int page = floor((scrollView.contentOffset.x - pageWidth / 2) / pageWidth) + 1;
  _label.text = [_namesArray objectAtIndex:page];
  NSLog(@"Scrolling - You are now on page %i, and the name for the label is: %@", page, [_namesArray objectAtIndex:page]);
}

希望有帮助！

如何在UIScrollview中为每个页面更改标签文本不同的文本？

1 个答案: