iOS:制作具有动态高度的 UIScrollView 的最佳方法?

问题描述

我目前正在设置具有以下结构的 UIScrollView

I'm currently setting up a UIScrollView with the following structure

UIScrollView
--ContentView (UIView)
  --ContainerView1 (UIView)
     --UILabel1
     --UILabel2
  --ContainerView2 (UIView)
     --UILabel3
     --UILabel4
  --ContainerView3 (UIView) 
     --UILabel5
     --UILabel6

我已经为上面的所有元素固定了所有四个边，并且还定义了它们的高度限制(如果我没有这样做，故事板会抱怨零高度).

I've pinned all the four edges for all the elements above and also have defined their height constraints (Storyboard complaints of zero height if I didn't do so).

现在，每当我的 UILabel 从服务器接收到它的文本时，我都会为所有标签调用 sizeToFit.然后我使用 containerViews 的 lastObject 来计算假设的新高度.然后我调用 setNeedsLayout.但是，我的应用没有任何变化！

Now whenever my UILabel receives its text from the server, I call sizeToFit for all the labels. Then I use the lastObject of the containerViews to calculate the supposing new height. Then I call setNeedsLayout. However, nothing changes in my app!

这是我用来计算新高度和调整的代码.也许我编程错了?对不起，我的约束概念不强，可能也设置了错误的约束?

This is the code that I use to calculate the new height and adjust. Perhaps have I programmed it wrong? Sorry my concept on constraints is not strong, may have set the constraints the wrong way too?

- (void) relayoutAllSubViews: (NSArray *) arrayOfContainerViews
{
    //Relayout subviews
    for (int i = 0; i < [arrayOfContainerViews count]; i++)
    {
        UIView * indView = [arrayOfContainerViews objectAtIndex:i];

        if (indView.hidden == YES)
        {
            indView.frame = CGRectMake(indView.frame.origin.x, indView.frame.origin.y, indView.frame.size.width, 0);

        }
        else
        {
            UIView * lastSubviewInView = [indView.subviews lastObject];
            CGFloat subviewEndPos = lastSubviewInView.frame.origin.y + lastSubviewInView.frame.size.height;

            if ((subviewEndPos - (indView.frame.origin.y + indView.frame.size.height)) > 0)
            {
                indView.frame = CGRectMake(indView.frame.origin.x, indView.frame.origin.y, indView.frame.size.width, (subviewEndPos - indView.frame.origin.y));
            }

        }
    }

    //Adjust scrollview
    UIView * lastView = [self.scrollView.subviews lastObject];
    CGFloat newEndPos = lastView.frame.origin.y + lastView.frame.size.height;
    self.contentView.bounds = CGRectMake(self.contentView.bounds.origin.x, self.contentView.bounds.origin.y, self.contentView.bounds.size.width, (newEndPos - self.contentView.bounds.origin.y));
    self.scrollView.contentSize = self.contentView.bounds.size;

    [self.view setNeedsLayout];
}

需要帮助！！

推荐答案

//使用下面的代码来设置滚动视图的内容大小.

//use the below code to set the content size of a scroll view.

    float newHeight=0.0f;
        for(UIView *subViews in [scrollViewObj subviews])
        {
            if([subViews isKindOfClass:[UIView class]])
            {
                newHeight=newHeight+(subViews.frame.origin.x+subViews.frame.size.height);
            }
        }
        NSLog(@"%f",newHeight);
        [scrollView setContentSize:CGSizeMake(300, newHeight)];//change the width as you need

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