UITableViewCell minimum height with automatically resizing cells

问题

I am using automatically resizing cells in my project. I want to keep the cells at a minimum height, but I cannot set a minimum height constraint for my cells in my Content View (as it is greyed out in the Add New Constraints view:

Is there anyway to add minimum height constraints for my cells?

回答1:

When UITableViewAutomaticDimension is enabled the system calls UITableViewCell's systemLayoutSizeFittingSize:withHorizontalFittingPriority:verticalFittingPriority: method to calculate the cell height, so you can subclass UITableViewCell and override this method to force a minimum height for the cell, in this way

class MinHeightTableViewCell: UITableViewCell {

    var minHeight: CGFloat?

    override func systemLayoutSizeFitting(_ targetSize: CGSize, withHorizontalFittingPriority horizontalFittingPriority: UILayoutPriority, verticalFittingPriority: UILayoutPriority) -> CGSize {
        let size = super.systemLayoutSizeFitting(targetSize, withHorizontalFittingPriority: horizontalFittingPriority, verticalFittingPriority: verticalFittingPriority)
        guard let minHeight = minHeight else { return size }
        return CGSize(width: size.width, height: max(size.height, minHeight))
    }
}

And then

public func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
    let cell = tableView.dequeueReusableCell(withIdentifier: "minHeightCell", for: indexPath) as! MinHeightTableViewCell
    cell.minHeight = 62 // change with your desidered min height
    cell.textLabel?.text = "some text"
    return cell
}

回答2:

set a height constraint as height >= 60.0 No need to do anything

回答3:

You can makes your cells as dynamic height by returning the UITableViewAutomaticDimension in height calculation methods of tableview. But for this your cell design constraints should be like the below one

- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath{
    return UITableViewAutomaticDimension;
}


- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath{
    return UITableViewAutomaticDimension;
}

Note: Todo Title is the static height. And description will be dynamic height. So description does not own the height constrain. Important thing is you need set a number of lines as 0 for description label

回答4:

simple added height constraint with minimum height you want and then change it relation to "Greater then Equal to". look highlighted section of screen short.

回答5:

Follow these steps, to set automatic dimension for cell with some minimum height.

Assign and implement tableview dataSource and delegate
Assign UITableViewAutomaticDimension to rowHeight & estimatedRowHeight
Implement delegate/dataSource methods (i.e. heightForRowAt and return a value UITableViewAutomaticDimension to it)

Objective C:

// in ViewController.h
#import <UIKit/UIKit.h>

@interface ViewController : UIViewController <UITableViewDelegate, UITableViewDataSource>

  @property IBOutlet UITableView * table;

@end

// in ViewController.m

- (void)viewDidLoad {
    [super viewDidLoad];
    self.table.dataSource = self;
    self.table.delegate = self;

    self.table.rowHeight = UITableViewAutomaticDimension;
    self.table.estimatedRowHeight = UITableViewAutomaticDimension;
}

-(CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath {

    return UITableViewAutomaticDimension;
}

Swift:

@IBOutlet weak var table: UITableView!

override func viewDidLoad() {
    super.viewDidLoad()

    // Don't forget to set dataSource and delegate for table
    table.dataSource = self
    table.delegate = self

    // Set automatic dimensions for row height
    table.rowHeight = UITableViewAutomaticDimension
    table.estimatedRowHeight = UITableViewAutomaticDimension
}



// UITableViewAutomaticDimension calculates height of label contents/text
func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat {
    return UITableViewAutomaticDimension
}

For label instance in UITableviewCell

Set number of lines = 0 (& line break mode = truncate tail)
Set all constraints (top, bottom, right left) with respect to its superview/ cell container.
Note: Set minimum height for label, if you want minimum vertical area covered by label, even if there is no data.

来源：https://stackoverflow.com/questions/36804302/uitableviewcell-minimum-height-with-automatically-resizing-cells

标签

ios

swift

uitableview

autolayout

tableviewcell