在不同 Y 位置的 UIView 中添加多个 UIButton

Question

我知道如何以编程方式将 UIButton 添加到 UIView。但是在之前的 YPosition 中添加了一定数量的 UIButtons 之后，我一直坚持在新的 YPosition 中添加 UIButton。

这是我的情况：

• 要添加的 UIButton 数量来自 NSArray - 我们取 20

• UIView 已经添加到 UIViewController - 让我们调用
  '按钮视图'

• 我正在使用循环创建 UIButton（最多 20 个）。我已经设置了
  buttonWidth 为 70，buttonHeight 为 45

• 我正在获取屏幕尺寸并将其除以 buttonWith，所以
  至于计算每行可以容纳的项目数 或每个 Y 位置。

• 如果屏幕宽度为 414，则 414/70 = ~5.9，我将其视为

• 前 5 个 UIButton 的 YPosition 为 0，XPosition 从 0 开始，为后续按钮添加 buttonWidth。

• 接下来的 5 个 UIButton (6-10) 应该将新的 YPosition 设置为 1-5 UIButton Yposition(0)+buttonHeight(45)+somespace(10)= 55 并且 XPostion 应该 从 0 开始。

• 对于下一组 UIButtons(11-15)，YPosition 应该是
  Yposition(55)+buttonHeight(45)+somespace(10)= 100 和 XPosition 以 0 开头

如何做到这一点？下面是我的代码

xPos = 8.0f; 
yPos = 0.0f;
totalSlots =timeslots.Count - //Total Number UIButtons to be creted
buttonWidth = 70;
buttonHeight = 45;
buttonViewWidth = this.view.frame.size.width // I'm getting the screen
buttonPerLine = scrollViewWidth / (buttonWidth + 10); // This calculates no.of.buttons per line/Y Position. I'm rounding off as said before
numberOfLine = totalSlots / buttonPerLine // This gives how many lines needed

for (int i = 0; i < totalSlots; i++)
                        {
timeSlotbtn[i] = new UIButton();
                        timeSlotbtn[i] = new UIButton();
                        timeSlotbtn[i].Frame = new CGRect(xPos, yPos, buttonWidth, buttonHeight);
                        timeSlotbtn[i].SetTitle(buttonText, UIControlState.Normal);
                        timeSlotbtn[i].Layer.BorderWidth = 2.0f;
                        timeSlotbtn[i].Layer.CornerRadius = 3;
                        timeSlotbtn[i].Tag = i;
                        timeSlotbtn[i].TitleLabel.Font = UIFont.FromName("HelveticaNeue-bold", 14.0f);


                xPos = timeSlotbtn[i].Frame.Location.X + buttonWidth + buttonSpace;
                timeslotScrollView.AddSubview(timeSlotbtn[i]);
}

请注意，上面的代码是用 Xamarin.iOS 编写的。如果您知道解决方案，那么您可能可以用 Objective-c 编写。总之，逻辑应该是一样的。

Answer 1

            int buttonWidth = 65;
            int buttonSpace = 5;
            int buttonHeight = 30;
            int totalSlots = timeslots.Count;
            nfloat screenSize = firstViewController.screenSize;
            nfloat buttonPerLine = screenSize / (buttonWidth + buttonSpace );
            int roundedButtonPerLine = Convert.ToInt32(Math.Floor(buttonPerLine));
            nfloat totalLines = totalSlots / buttonPerLine;
            int roundedTotalLines = Convert.ToInt32(Math.Ceiling(totalLines));
            nfloat determineXPosition = (screenSize - (8 + (buttonWidth * roundedButtonPerLine) + (buttonSpace*(roundedButtonPerLine-1))))/2;
            nfloat xPos;
            if (roundedTotalLines > 1)
            {
                 xPos = determineXPosition;
            }
            else
            {
                 xPos = 8.0f;
            }

            nfloat yPos = 0.0f;
            int currentLine = 1;
            int loopCount = 1;

            for (int i = 0; i < room.timeslots.Count; i++)
            {
                var buttonText = room.timeslots[i].startDate.ConvertDateToStanfordLocalTime();//hour + ":" + minute + "p";
                timeSlotbtn[i] = new UIButton();
                timeSlotbtn[i].Frame = new CGRect(xPos, yPos, buttonWidth, buttonHeight);
                timeSlotbtn[i].SetTitle(buttonText, UIControlState.Normal);
                timeSlotbtn[i].Layer.BorderWidth = 2.0f;
                timeSlotbtn[i].Layer.CornerRadius = 3;
                timeSlotbtn[i].Tag = i;
                timeSlotbtn[i].TitleLabel.Font = UIFont.FromName("HelveticaNeue-bold", 14.0f);

                xPos = timeSlotbtn[i].Frame.Location.X + buttonWidth + buttonSpace;
                timeslotScrollView.AddSubview(timeSlotbtn[i]);


                if (loopCount == roundedButtonPerLine)
                {

                    if (roundedTotalLines > 1)
                    {
                         xPos = determineXPosition;
                    }
                    else
                    {
                         xPos = 8.0f;
                    }
                    currentLine++;
                    yPos = timeSlotbtn[i].Frame.Location.Y + buttonHeight + buttonSpace;
                    loopCount = 0;
                }
                loopCount++;
            }