[英]Change UITableViewCell Height based UICollectionView content size height
I'm working on a calendar created with a UICollectionView
.我正在处理使用UICollectionView
创建的日历。
The UICollectionView
is located inside a UITableViewCell
The UITableViewCell
in the heightForRowAt
method return UITableView.automaticDimension
该UICollectionView
位于内部UITableViewCell
的UITableViewCell
在heightForRowAt
方法return UITableView.automaticDimension
The UICollectionView
used to create the calendar updates its height based on how many days are shown, for example the month of November has its first day which falls on Sunday so to place the day under the label "Sunday" the collectionView
must necessarily add a whole line.用于创建日历的UICollectionView
根据显示的天数更新其高度,例如11 月的第一天落在星期日,因此要将这一天放置在标签“星期日”下, collectionView
必须添加一个整体线。
Normally each month has 5 rows (week) but when the first day of the month happens on Sunday the collectionview
returns 6通常每个月有 5 行(周)但是当月的第一天发生在星期日时, collectionview
返回 6
Now as I said I was able to update the height of the UICollectionView based on how many rows it returns but I cannot dynamically change the height of the TableViewCell
that contains the collectionView
现在正如我所说,我能够根据它返回的行数更新UICollectionView的高度,但我无法动态更改包含collectionView
的TableViewCell
的高度
How can I resize the tableViewCell
based on the height of the CollectionView
within it?如何根据其中的CollectionView
的高度调整tableViewCell
的大小?
EDIT编辑
my cell我的手机
I have set UITableView.automaticDimension
for the height of the cell that contains the CalendarView
我已经为包含CalendarView
的单元格的高度设置了UITableView.automaticDimension
In the class CalendarView: UIView
I created a variable CGFloat calendarH to set the default height of the collectionView在类CalendarView: UIView
我创建了一个变量 CGFloat calendarH 来设置 collectionView 的默认高度
CollectionView implementation集合视图实现
I have added an observer which tracks the height of the collctionView
when it changes我添加了一个观察者,它在collctionView
发生变化时跟踪它的高度
I am currently able to change the height of the collectionView
but its superview ( bookingCalendarView
) and the tableView cell continue to remain with a fixed height and do not adapt to the collectionView
我目前可以更改collectionView
的高度,但它的bookingCalendarView
视图( bookingCalendarView
)和 tableView 单元格继续保持固定高度并且不适应collectionView
You need to create an @IBOutlet
for your collection view's height constraint.您需要为集合视图的高度约束创建一个@IBOutlet
。
When you set a row's calendar / month data, determine whether you need 5 or 6 rows.当您设置一行的日历/月份数据时,请确定您需要 5 行还是 6 行。
If it's 6, set the .constant
on the height constraint to 750
如果是 6,则将高度约束上的.constant
设置为750
If it's 5, set the .constant
on the height constraint to 675
如果是 5,则将高度约束上的.constant
设置为675
Edit编辑
First, I'm going to suggest you forget about using a "self-sizing" collection view.首先,我将建议您忘记使用“自我调整大小”的集合视图。 UICollectionView
is designed to lay out cells based on the size of the collection view , providing automatic scrolling when there are too many cells. UICollectionView
旨在根据集合视图的大小对单元格进行布局,在单元格过多时提供自动滚动。
Trying to "self-size" it may work in one instance, but fail in another.尝试“自我调整”它可能在一种情况下有效,但在另一种情况下会失败。 The reason it fails in this case is because your table view lays out the cell and calculates its height before the collection view is populated, and thus before it can "self-size."在这种情况下它失败的原因是因为您的表格视图在填充集合视图之前布置了单元格并计算了它的高度,因此在它可以“自我调整大小”之前。
Instead, since you know your cell Height is 75, you can calculate how many rows your calendar will need and either set the .constant
on a height constraint for your collection view, or (since you're already using heightForRowAt
) calculate the row height there.相反,因为你知道你的单元格高度是 75,你可以计算你的日历需要多少行,或者在你的集合视图的高度约束上设置.constant
,或者(因为你已经在使用heightForRowAt
)计算行高那里。
Look at this code:看看这段代码:
let dateComponents = DateComponents(year: year, month: month)
// startDate will be the first date of the month (Jan 1, Feb 1, Mar 1, etc...)
guard let startDate = calendar.date(from: dateComponents) else {
fatalError("Something is wrong with the date!")
}
// get the range of days in the month
guard let range = calendar.range(of: .day, in: .month, for: startDate) else {
fatalError("Something is wrong with the date!")
}
// get number of days in the month
let numberOfDaysInMonth = range.count
// get the day of the week for the first date in the month
// this returns 1-based numbering
// Nov 1, 2020 was a Sunday, so this would return 1
let startDayOfWeek = Calendar.current.component(.weekday, from: startDate)
// add the "leading days to the start date"
// so, if startDayOfWeek == 3 (Tuesday)
// we need to add 2 "empty day cells" for Sunday and Monday
let totalCellsNeeded = numberOfDaysInMonth + (startDayOfWeek - 1)
// calculate number of rows needed -- this will be 4, 5 or 6
// the only time we get 4 is if Feb 1st in a non-leapYear falls on a Sunday
let numRows = Int(ceil(Double(totalCellsNeeded) / Double(7)))
// we now know the Height needed for the collection view
// you said your calendar cell height is 75, so...
// cvHeight = numRows * 75
We can put that in a loop and print()
the information to the debug console like this:我们可以把它放在一个循环中并将信息print()
到调试控制台,如下所示:
override func viewDidLoad() {
super.viewDidLoad()
let calendar = Calendar.current
// 2026 is the next year where Feb starts on a Sunday
// so let's use that year to see that we get 4 rows for Feb
let year = 2026
for month in 1...12 {
let dateComponents = DateComponents(year: year, month: month)
// startDate will be the first date of the month (Jan 1, Feb 1, Mar 1, etc...)
guard let startDate = calendar.date(from: dateComponents) else {
fatalError("Something is wrong with the date!")
}
// get the range of days in the month
guard let range = calendar.range(of: .day, in: .month, for: startDate) else {
fatalError("Something is wrong with the date!")
}
// get number of days in the month
let numberOfDaysInMonth = range.count
// get the day of the week for the first date in the month
// this returns 1-based numbering
// Nov 1, 2020 was a Sunday, so this would return 1
let startDayOfWeek = Calendar.current.component(.weekday, from: startDate)
// add the "leading days to the start date"
// so, if startDayOfWeek == 3 (Tuesday)
// we need to add 2 "empty day cells" for Sunday and Monday
let totalCellsNeeded = numberOfDaysInMonth + (startDayOfWeek - 1)
// calculate number of rows needed -- this will be 4, 5 or 6
// the only time we get 4 is if Feb 1st in a non-leapYear falls on a Sunday
let numRows = Int(ceil(Double(totalCellsNeeded) / Double(7)))
// we now know the Height needed for the collection view
// you said your calendar cell height is 75, so...
// cvHeight = numRows * 75
// debug output
let dateFormatter = DateFormatter()
dateFormatter.dateFormat = "EEEE"
let dayName = dateFormatter.string(from: startDate)
dateFormatter.dateFormat = "LLLL y"
let dateString = dateFormatter.string(from: startDate)
let dayPadded = dayName.padding(toLength: 10, withPad: " ", startingAt: 0)
let datePadded = dateString.padding(toLength: 16, withPad: " ", startingAt: 0)
print("\(datePadded) has \(numberOfDaysInMonth) days, starting on \(dayPadded) requiring \(numRows) rows")
}
}
Here's the output:这是输出:
January 2026 has 31 days, starting on Thursday requiring 5 rows
February 2026 has 28 days, starting on Sunday requiring 4 rows
March 2026 has 31 days, starting on Sunday requiring 5 rows
April 2026 has 30 days, starting on Wednesday requiring 5 rows
May 2026 has 31 days, starting on Friday requiring 6 rows
June 2026 has 30 days, starting on Monday requiring 5 rows
July 2026 has 31 days, starting on Wednesday requiring 5 rows
August 2026 has 31 days, starting on Saturday requiring 6 rows
September 2026 has 30 days, starting on Tuesday requiring 5 rows
October 2026 has 31 days, starting on Thursday requiring 5 rows
November 2026 has 30 days, starting on Sunday requiring 5 rows
December 2026 has 31 days, starting on Tuesday requiring 5 rows
So... either in:所以......要么在:
cellForRowAt
... calculate the needed height and set the CV height in the cell, or cellForRowAt
... 计算所需的高度并在单元格中设置 CV 高度,或heightForRowAt
... calculate and return the needed height for the row heightForRowAt
... 计算并返回该行所需的高度Side note: I'd suggest using auto-layout for all of your cells, instead of returning various row heights.旁注:我建议对所有单元格使用自动布局,而不是返回各种行高。
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