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我有一个视图控制器,我向其中添加了一个滚动视图。然后我添加 UITextFields 的数量,根据用户需要多少文本字段动态调整 UIScrollView.contentSize 的大小。到目前为止,我已经检查并仔细检查了代表、contentSize 属性的大小、文本字段的来源和大小。我使用以下代码来做到这一点:

-(void)setScrollViewSize
{
    NSLog(@"Rows count: %d", self.rows);
    self.matrixInputScrollView.contentSize = CGSizeZero;
    CGSize scrollVieSize;
    if (!self.columns) {
    NSLog(@"Setting scroll view frame row");
    scrollVieSize = CGSizeMake(self.rows * TEXT_FIELD_WIDTH + (self.rows - 1) * TEXT_FIELD_INDENT, TEXT_FIELD_HEIGHT);
    }
    else
    {
        NSLog(@"Setting scroll view frame rows and columns");
        scrollVieSize = CGSizeMake(self.rows * TEXT_FIELD_WIDTH + (self.rows - 1) * TEXT_FIELD_INDENT, self.columns * TEXT_FIELD_HEIGHT + (self.columns - 1) * TEXT_FIELD_INDENT);
    }
    self.matrixInputScrollView.contentSize = scrollVieSize;

     if (!self.columns) {
         for (NSInteger i = 0; i < self.rows; ++i) {
             NSLog(@"Text filed adding");
             UITextField *textField = [[UITextField alloc] initWithFrame:CGRectMake(i * (TEXT_FIELD_WIDTH + TEXT_FIELD_INDENT), 0, TEXT_FIELD_WIDTH, TEXT_FIELD_HEIGHT)];
             NSLog(@"uitextfield position ad size: %f %f %f %f", textField.frame.origin.x, textField.frame.origin.y, textField.frame.size.width, textField.frame.size.height);
             [self.matrixInputScrollView addSubview:textField];
         }
      }
      else
      {
          for (NSInteger i = 0; i < self.rows; ++i) {
             for (NSInteger j = 0; j < self.columns; ++j) {
                  UITextField *textField = [[UITextField alloc] initWithFrame:CGRectMake(i * (TEXT_FIELD_WIDTH + TEXT_FIELD_INDENT), j * (TEXT_FIELD_HEIGHT + TEXT_FIELD_INDENT), TEXT_FIELD_WIDTH, TEXT_FIELD_HEIGHT)];
                   [self.matrixInputScrollView addSubview:textField];
            }
         }
      }

    NSLog(@"Before setNeedsDisplay");
    NSLog(@"Scroll view position and size: %f %f %f %f",      self.matrixInputScrollView.frame.origin.x, self.matrixInputScrollView.frame.origin.y,   self.matrixInputScrollView.frame.size.width, self.matrixInputScrollView.frame.size.height);
    NSLog(@"Scroll view content size: %f %f", self.matrixInputScrollView.contentSize.width,    self.matrixInputScrollView.contentSize.height);
}

上述样本的输出如下:

2013-10-16 15:27:30.672 RZCalc[2765:a0b] Rows count: 3
2013-10-16 15:27:30.672 RZCalc[2765:a0b] Setting scroll view frame row
2013-10-16 15:27:30.673 RZCalc[2765:a0b] Text filed adding
2013-10-16 15:27:30.673 RZCalc[2765:a0b] uitextfield position ad size: 0.000000 0.000000 40.000000 30.000000
2013-10-16 15:27:30.674 RZCalc[2765:a0b] Text filed adding
2013-10-16 15:27:30.674 RZCalc[2765:a0b] uitextfield position ad size: 50.000000 0.000000 40.000000 30.000000
2013-10-16 15:27:30.674 RZCalc[2765:a0b] Text filed adding
2013-10-16 15:27:30.675 RZCalc[2765:a0b] uitextfield position ad size: 100.000000 0.000000 40.000000 30.000000
2013-10-16 15:27:30.675 RZCalc[2765:a0b] Before setNeedsDisplay
2013-10-16 15:27:30.676 RZCalc[2765:a0b] Scroll view position and size: 76.000000 42.000000 244.000000 246.000000
2013-10-16 15:27:30.676 RZCalc[2765:a0b] Scroll view content size: 140.000000 30.000000

您在这里看到的是正在创建并放置在屏幕上的滚动视图,相应地调整了内容大小,并创建了 3 个文本字段并将其添加到滚动视图,它们的来源和大小在 contentSize 限制内。

结果是滚动视图显示在屏幕上,而文本字段不显示。

您能否判断上述代码是否有问题,或者您是否需要有关它的更多信息?

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1 回答 1

1

添加评论作为答案:

将标签的背景颜色设置为与滚动视图颜色不同的颜色,以查看它们是否存在。您没有为标签设置任何格式选项,因此它们目前可能只是透明视图。

于 2013-10-17T13:12:13.703 回答