I would like to update the content of my custom cell with his height so I wrote this code :
extension MyViewController: UITableViewDelegate {
func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat {
return UITableViewAutomaticDimension
}
func tableView(_ tableView: UITableView, estimatedHeightForRowAt indexPath: IndexPath) -> CGFloat {
return 100
}
}
in my customCellTableView xib i added the top,right,left,bottom constraint to all the labels and also the numberOflines properties to 0
but when t run the app i got a cell of 250 height to all the cells which is very abnormal. I work on Xcode 9 and swift 4.
please if someone can help me,
Related
I am using the following method to move between viewControllers:
func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
self.performSegue(withIdentifier: "segueJokeDetail", sender: self)
}
That's the capture from the storyboard showing segueId
If you do a segue from a UITableViewCell in interface builder, you don’t need to do it in the UITableView delegate as well.
I would like to know if it was possible to use UITableViewVibrantCell on a UITableView (not controller). I can't figure out how to do it.
I'm doing :
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = self.tableView(tableView, cellForRowAt: indexPath) as! UITableViewVibrantCell
cell.blurEffectStyle = SideMenuManager.default.menuBlurEffectStyle
return cell
}
My UIViewController inherit from UITableViewDataSource and UITableViewDelegate.
Thank you for your help :)
I'm trying to figure out how to make a table of images with varying sizes. Where the images get resized to fit the width of the device, and the cells fit the height of the image. Currently the images are getting sized to the table cells.
Xcode project
ViewController
import UIKit
class ViewController: UIViewController, UITableViewDataSource {
var images = ["abstract","city","city2","nightlife"]
override func viewDidLoad() {
super.viewDidLoad()
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
}
func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
var cell = tableView.dequeueReusableCellWithIdentifier("cell", forIndexPath: indexPath) as! ImageTableViewCell
cell.configureCellWith(images[indexPath.item])
return cell
}
func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return images.count
}
}
ImageTableViewCell
import UIKit
class ImageTableViewCell: UITableViewCell {
#IBOutlet weak var tableImage: UIImageView!
func configureCellWith(image: String) {
tableImage.image = UIImage(named: image)
}
}
Implement heightForRowAtIndexPath to set the cell height to the correct height for that cell's image.
(You can determine that height by examining the image's width and height, and divide to give the aspect ratio. Now use that aspect ratio to determine the height based on the cell width, which is the table width.)
This is actually fairly simple. You just have to implement heightForRowAtIndexPath function and return height of image for each cell.
override func tableView(tableView: UITableView, heightForRowAtIndexPath indexPath: NSIndexPath) -> CGFloat {
return image[indexPath.row].size.height
}
I'm using the Beginning Swift Programming book by AppCoda and I can't seem to figure out what is wrong with this block of code.
import UIKit
class ViewController: UIViewController, UITableViewDataSource, UITableViewDelegate {
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
var restaurantNames = ["Cafe Deadend", "Homei", "Teakha", "CafeLoisl", "Petite Oyster", "For Kee Restaurant", "Po's Atelier", "Bourke Street Bakery", "Haigh’s Chocolate", "Palomino Espresso", "Upstate", "Traif", "Graham Avenue Meats And Deli", "Waffle & Wolf", "Five Leaves", "Cafe Lore", "Confessional", "Barrafina", "Donostia", "Royal Oak", "CASK Pub and Kitchen"]
func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
// Return the number of rows in the section.
return restaurantNames.count
}
func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) ->
UITableViewCell {
let cellIdentifier = "Cell"
let cell = tableView.dequeueReusableCellWithIdentifier(cellIdentifier, forIndexPath: indexPath) as UITableViewCell
// Configure the cell...
cell.textLabel.text = restaurantNames[indexPath.row]
return cell
}
}
This line is throw a 'AnyObject is not convertible to 'UITableViewCell'
let cell = tableView.dequeueReusableCellWithIdentifier(cellIdentifier, forIndexPath: indexPath) as UITableViewCell
I'm really new to Swift and iOS programming in general so any help would be appreciated.
You need to change as to as!
var cell = tableView.dequeueReusableCellWithIdentifier("Cell", forIndexPath: indexPath) as! UITableViewCell
Also make sure that you have added a prototype cell to your storyboard with the reusable string name "Cell"
//MARK: Tableview
func tableView(tableView: UITableView!, numberOfRowsInSection section: Int) -> Int
{
return tabledata.count
}
func tableView(tableView: UITableView!,
cellForRowAtIndexPath indexPath: NSIndexPath!) -> UITableViewCell!
{
let cell:UITableViewCell = UITableViewCell(style:UITableViewCellStyle.Default, reuseIdentifier:"Cell")
cell.textLabel?.text = tabledata[indexPath.row]
return cell
}
I have used this code for tableview....You can change this according to your need.Even I'm new in swift or else I would've correct your code.
I am trying to set the height of each row in the tableView to the height of the corresponding cell with this code:
override func tableView(tableView: UITableView!, heightForRowAtIndexPath indexPath: NSIndexPath!) -> CGFloat {
var cell = tableView.cellForRowAtIndexPath(indexPath)
return cell.frame.height
}
I get this error when initialising var cell :
Thread 1:EXC_BAD_ACCESS(code=2,address=0x306d2c)
For setting row height there is separate method:
For Swift 3
func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat {
return 100.0;//Choose your custom row height
}
Older Swift uses
func tableView(tableView: UITableView, heightForRowAtIndexPath indexPath: NSIndexPath) -> CGFloat {
return 100.0;//Choose your custom row height
}
Otherwise you can set row height using:
self.tableView.rowHeight = 44.0
In ViewDidLoad.
Put the default rowHeight in viewDidLoad or awakeFromNib. As pointed out by Martin R., you cannot call cellForRowAtIndexPath from heightForRowAtIndexPath
self.tableView.rowHeight = 44.0
func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat {
var height:CGFloat = CGFloat()
if indexPath.row == 1 {
height = 150
}
else {
height = 50
}
return height
}
yourTableView.rowHeight = UITableViewAutomaticDimension
Try this.
As pointed out in comments, you cannot call cellForRowAtIndexPath inside heightForRowAtIndexPath.
What you can do is creating a template cell used to populate with your data and then compute its height.
This cell doesn't participate to the table rendering, and it can be reused to calculate the height of each table cell.
Briefly, it consists of configuring the template cell with the data you want to display, make it resize accordingly to the content, and then read its height.
I have taken this code from a project I am working on - unfortunately it's in Objective C, I don't think you will have problems translating to swift
- (CGFloat) tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath {
static PostCommentCell *sizingCell = nil;
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
sizingCell = [self.tblComments dequeueReusableCellWithIdentifier:POST_COMMENT_CELL_IDENTIFIER];
});
sizingCell.comment = self.comments[indexPath.row];
[sizingCell setNeedsLayout];
[sizingCell layoutIfNeeded];
CGSize size = [sizingCell.contentView systemLayoutSizeFittingSize:UILayoutFittingCompressedSize];
return size.height;
}
Problem Cause:
The problem is that the cell has not been created yet. TableView first calculates the height for row and then populates the data for each row, so the rows array has not been created when heightForRow method gets called. So your app is trying to access a memory location which it does not have the permission to and therefor you get the EXC_BAD_ACCESS message.
How to achieve self sizing TableViewCell in UITableView:
Just set proper constraints for your views contained in TableViewCell's view in StoryBoard. Remember you shouldn't set height constraints to TableViewCell's root view, its height should be properly computable by the height of its subviews -- This is like what you do to set proper constraints for UIScrollView. This way your cells will get different heights according to their subviews. No additional action needed
Make sure Your TableView Delegate are working as well.
if not then
in your story board or in .xib
press and hold Control + right click on tableView drag and Drop to your Current ViewController.
swift 2.0
func tableView(tableView: UITableView, heightForRowAtIndexPath indexPath: NSIndexPath) -> CGFloat {
return 60.0;
}
There is no way to call tableView.dequeueReusableCell from within tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath).
So you have to compute the height from the data.
In my case that was not possible because I have a textView in the cell, which size I did not know.
So I come around with the following strategies:
Do not use tableView.dequeueReusableCell. Just use an array of cells yo have under full control. If your cell is not too large in memory and you don't have too much rows, this is the simplest strategy.
Use a dummy cell, configure it with your data and compute the size.
Try code like this copy and paste in the class
func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat {
return 100
}