I pass data(value) from a ViewController to a TableView (see below), but the tableview fill always only the first row. It don´t count. How can I fix it?
The tableview should show every passing data in a new row.
#IBAction func a(sender: UIButton) {
txtBalkenbewehrung = ausgabe.text
performSegueWithIdentifier("transferfile", sender: sender)
}
import UIKit
var txtBalkenbewehrung: String?
class EBTableViewController: UITableViewController, UITableViewDelegate, UITableViewDataSource {
var rowData = [txtBalkenbewehrung]
override func viewDidLoad() {
super.viewDidLoad()
self.tableView.editing = true
self.tableView.reloadData()
// Uncomment the following line to preserve selection between presentations
// self.clearsSelectionOnViewWillAppear = false
// Uncomment the following line to display an Edit button in the navigation bar for this view controller.
// self.navigationItem.rightBarButtonItem = self.editButtonItem()
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
// MARK: - Table view data source
override func numberOfSectionsInTableView(tableView: UITableView) -> Int {
// #warning Potentially incomplete method implementation.
// Return the number of sections.
return 1
}
override func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
// #warning Incomplete method implementation.
// Return the number of rows in the section.
return rowData.count
}
override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCellWithIdentifier("textcell",
forIndexPath: indexPath) as! UITableViewCell
// let data = rowData[indexPath.row]
cell.textLabel!.text = rowData[indexPath.row]
return cell
}
`
First, please make sure that you correctly format your code!
The behavior seems coherent, as the data is a an array with a single element, txtBalkenbewehrung
You need to fill the array with more element if you want to display more than one
I'm fairly new to xcode and Objective-C. Here is my problem:
I have a view controller with buttons and links to other view controllers on it.
On this view controller I have added a table view in which the cells will be used like a form
the cells will have text fields and labels
When trying to set this up and building it, it gives me an error saying I need to wire up my table view to the view controller somehow.
I know it is something to do with the data source and the table view delegate but I don't know how to wire the table view to the data source and delegate of my view controller.
Could anyone tell me how, or link me to an easy to follow guide on this?
Thanks
The easiest way would be to create a new Swift, or Objective-C Class and extend UITableViewController with it. This will create you a perfect sample code on how to write a UITableView DataSource and Delegate, which could be just copied.
After that, set your UITableViews delegate and datasource properties to self in viewdidload and implement UITableViewDataSource, UITableViewDelegate.
Edit
import UIKit
class ViewController: UIViewController, UITableViewDataSource, UITableViewDelegate {
#IBOutlet weak var myTable: UITableView!
var myDataArray: NSArray!
override func viewDidLoad() {
super.viewDidLoad()
myDataArray = NSArray(objects: "Peter", "Paul", "Marry")
myTable.dataSource = self
myTable.delegate = self
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
}
//MARK: TableView DataSource
func numberOfSectionsInTableView(tableView: UITableView) -> Int {
return 1
}
func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return myDataArray.count
}
func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
var cell: UITableViewCell? = tableView.dequeueReusableCellWithIdentifier("Cell") as? UITableViewCell
if (cell == nil) {
cell = UITableViewCell(style: UITableViewCellStyle.Default, reuseIdentifier: "Cell")
}
cell?.textLabel.text = myDataArray.objectAtIndex(indexPath.row) as NSString
return cell!
}
//MARK: TableView Delegate
func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
tableView.deselectRowAtIndexPath(indexPath, animated: true)
}
}
I quickly wired you up some Swift Example code, where you can see how to connect a table view, with the DataSource and Delegate of your Class.
I am using titleForHeaderInSection to show a header for a UITableView section. It worked fine with the iOS6 SDK, but the iOS7 SDK shows the header in all CAPS.
I guess it's part of Apple's updated Human Interface Guidelines; all examples in there show headers in all caps. Also, all section headers in Settings on my iPhone are in all caps.
However, I wonder if there is a way around that. Normally, I wouldn't mind showing caps if that improves consistency, but when I need to show people's names in a section header, it's a bit awkward.
Anybody any idea how to get around to capitalization?
Yes, we had very much a similar problem to this, and my own solution was as follows:
The Apple UITableViewHeaderFooterView documentation (the link to it is irritatingly long but you can find it easily with your favourite search engine) says you can access the textLabel of the header view without having to format your own view via viewForHeaderInSection method.
textLabel A primary text label for the view. (read-only)
#property(nonatomic, readonly, retain) UILabel *textLabel Discussion
Accessing the value in this property causes the view to create a
default label for displaying a detail text string. If you are managing
the content of the view yourself by adding subviews to the contentView
property, you should not access this property.
The label is sized to fit the content view area in the best way
possible based on the size of the string. Its size is also adjusted
depending on whether there is a detail text label present.
With some additional searching the best place to modify the label text was the willDisplayHeaderView method (suggested in How to implement `viewForHeaderInSection` on iOS7 style?).
So, the solution I came up with is pretty simple and just does a transformation of the text label string, after it's actually been set by titleForHeaderInSection:
-(NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section {
//I have a static list of section titles in SECTION_ARRAY for reference.
//Obviously your own section title code handles things differently to me.
return [SECTION_ARRAY objectAtIndex:section];
}
and then simply call the willDisplayHeaderView method to modify how it looks:
- (void)tableView:(UITableView *)tableView willDisplayHeaderView:(UIView *)view forSection:(NSInteger)section
{
if([view isKindOfClass:[UITableViewHeaderFooterView class]]){
UITableViewHeaderFooterView *tableViewHeaderFooterView = (UITableViewHeaderFooterView *) view;
tableViewHeaderFooterView.textLabel.text = [tableViewHeaderFooterView.textLabel.text capitalizedString];
}
}
You can put in your own 'if' or 'switch' clauses in there as the section number is also passed to the method, so hopefully it'll allow you to show your user/client name in capitalised words selectively.
solution which i found is add Title in "titleForHeaderInSection" method
- (NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section {
return #"Table Title";
}
and then call the willDisplayHeaderView method to Update :
- (void)tableView:(UITableView *)tableView willDisplayHeaderView:(UIView *)view forSection:(NSInteger)section
{
UITableViewHeaderFooterView *header = (UITableViewHeaderFooterView *)view;
header.textLabel.textColor = [UIColor darkGrayColor];
header.textLabel.font = [UIFont boldSystemFontOfSize:18];
CGRect headerFrame = header.frame;
header.textLabel.frame = headerFrame;
header.textLabel.text= #"Table Title";
header.textLabel.textAlignment = NSTextAlignmentLeft;
}
In Swift,
override func tableView(tableView: UITableView, willDisplayHeaderView view: UIView, forSection section: Int) {
let headerView = view as! UITableViewHeaderFooterView
headerView.textLabel.text = "My_String"
}
If you want to just keep the string as it is, you could simply do this:
- (void)tableView:(UITableView *)tableView willDisplayHeaderView:(UIView *)view forSection:(NSInteger)section {
if ([view isKindOfClass:[UITableViewHeaderFooterView class]] && [self respondsToSelector:#selector(tableView:titleForHeaderInSection:)]) {
UITableViewHeaderFooterView *headerView = (UITableViewHeaderFooterView *)view;
headerView.textLabel.text = [self tableView:tableView titleForHeaderInSection:section];
}
}
Swift solution:
func tableView(_ tableView: UITableView, willDisplayHeaderView view: UIView, forSection section: Int) {
if let headerView = view as? UITableViewHeaderFooterView, self.respondsToSelector(Selector("tableView:titleForHeaderInSection:")) {
headerView.textLabel?.text = self.tableView(tableView, titleForHeaderInSection: section)
}
}
One solution I found is to utilize UITableViewHeaderFooterView.
Instead of
- (NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section
{
return #"some title";
}
Do
- (UIView*)tableView:(UITableView *)tableView viewForHeaderInSection:(NSInteger)section
{
static NSString *identifier = #"defaultHeader";
UITableViewHeaderFooterView *headerView = [tableView dequeueReusableHeaderFooterViewWithIdentifier:identifier];
if (!headerView) {
headerView = [[UITableViewHeaderFooterView alloc] initWithReuseIdentifier:identifier];
}
headerView.textLabel.text = #"some title";
return headerView;
}
The annoying downside is that the table view will no longer automatically adjust the section header height for you. So if your header heights varies, you'll have to do something like this:
- (CGFloat)tableView:(UITableView *)tableView heightForHeaderInSection:(NSInteger)section
{
id headerAppearance = [UILabel appearanceWhenContainedIn:[UITableViewHeaderFooterView class], nil];
UIFont *font = [headerAppearance font];
CGFloat viewWidth = CGRectGetWidth(tableView.frame);
CGFloat xInset = 10;
CGFloat yInset = 5;
CGFloat labelWidth = viewWidth - xInset * 2;
CGSize size = [sectionInfo.name sizeWithFont:font constrainedToSize:CGSizeMake(labelWidth, MAXFLOAT)];
return size.height + yInset * 2;
}
I really don't like hard-coding layout information (the inset) this way, as it might break in the future version. If anyone has a better solution to get/set the header height, I'm all ears.
Thanks #Animal451. This is more generic solution that would work with any type of header string.
// We need to return the actual text so the header height gets correctly calculated
- (NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section
{
return self.headerString;
}
- (void)tableView:(UITableView *)tableView willDisplayHeaderView:(UIView *)view forSection:(NSInteger)section
{
UITableViewHeaderFooterView *header = (UITableViewHeaderFooterView *)view;
[header.textLabel setText:self.headerString]; //String in the header becomes uppercase. Workaround to avoid that.
}
To avoid duplication the header string can be declared anywhere else. I have done it in the -viewDidLoad method.
In addition to #Animal451's post.
For swift 3 you can use
func tableView(_ tableView: UITableView, willDisplayHeaderView view: UIView, forSection section: Int) {
guard section == 0 ,
let tableViewHeaderFooterView = view as? UITableViewHeaderFooterView
else { return }
tableViewHeaderFooterView.textLabel?.text = "Your awesome string"
}
And then ignore - titleForHeaderInSection:
Keep in mind that this code is for 1st section only. If you want to go through all of your sections, you'll need to add support for them
Swift 5
Static TableViewController & storyboard section title.
The below code will work the first letter capitalized.
override func tableView(_ tableView: UITableView, willDisplayHeaderView view: UIView, forSection section: Int) {
let titleView = view as! UITableViewHeaderFooterView
titleView.textLabel?.text = titleView.textLabel?.text?.capitalized
}
Simplest Solution for was below: Swift 2.x
func tableView(tableView: UITableView, willDisplayHeaderView view: UIView, forSection section: Int) {
header.textLabel?.text = header.textLabel?.text?.capitalizedString
}
Swift 3.x:
if let headerView = view as? UITableViewHeaderFooterView {
headerView.textLabel?.text? = headerView.textLabel?.text?.capitalized ?? ""
}
The solution which worked for me was to create a simple UILabel Instance Variable to use as the section header view. (Your needs may be different, but for me, I only needed to have text in my header...)
Then, inside viewForHeaderInSection, I set up the label as required, and return this label as the header view.
Then, whenever I want to update the text in the header, I simply change the label's text directly.
In the .h file:
#property (nonatomic, retain) UILabel *sectionHeaderLabel;
then in the .m file:
- (UIView*)tableView:(UITableView *)tableView viewForHeaderInSection:(NSInteger)section
{
return [self refreshMySectionHeaderLabel]; // I created this handy little method to update the header text
}
// Get the latest text for the section header...
-(UILabel *) refreshMySectionHeaderLabel {
// Initialise the first time.
if( sectionHeaderLabel == nil ) {
sectionHeaderLabel = [[UILabel alloc] initWithFrame: CGRectNull];
}
// ...
// May also set other attributes here (e.g. colour, font, etc...)
// Figure out the text...
sectionHeaderLabel.text = #"Your updated text here...";
return sectionHeaderLabel;
}
When I want to update my section header, I simply call:
[self refreshMySectionHeaderLabel];
...or you could simply call:
sectionHeaderLabel.text = #"The new text...";
Take note: I only have 1 section (section 0). You may need to account for multiple sections...
One liner solution, based on #Dheeraj D answer:
override func tableView(_ tableView: UITableView, willDisplayHeaderView view: UIView, forSection section: Int) {
(view as? UITableViewHeaderFooterView)?.textLabel?.text = (view as? UITableViewHeaderFooterView)?.textLabel?.text?.capitalized
}
SWIFT
In implementation, i found out that you need to specify section header text in both titleForHeaderInSection & willDisplayHeaderView function, othervise header hides.
extension ViewController: UITableViewDelegate, UITableViewDataSource {
func tableView(_ tableView: UITableView, titleForHeaderInSection section: Int) -> String? {
let sectionHeader = datasource[section].sectionHeader
// Header Title
return sectionHeader
}
func tableView(_ tableView: UITableView, willDisplayHeaderView view: UIView, forSection section: Int) {
guard let header = view as? UITableViewHeaderFooterView else { return }
header.textLabel?.textColor = UIColor.darkGray
header.textLabel?.font = UIFont.systemFont(ofSize: 20, weight: .semibold)
header.textLabel?.frame = header.frame
// Header Title
header.textLabel?.text = datasource[section].sectionHeader
}
}
Use the method viewForHeaderInSection to create the header title.
In viewDidLoad register a UITableViewHeaderFooterView
tableView.register(UITableViewHeaderFooterView.self, forHeaderFooterViewReuseIdentifier: "HeaderFooterViewID")
add delegate
override func tableView(_ tableView: UITableView, viewForHeaderInSection section: Int) -> UIView? {
let header = tableView.dequeueReusableHeaderFooterView(withIdentifier: "HeaderFooterViewID")
var config = header?.defaultContentConfiguration()
let title = "My Header Title"
let attribute = [ NSAttributedString.Key.foregroundColor: UIColor.blue ]
config?.attributedText = NSAttributedString(string: title, attributes: attribute)
header?.contentConfiguration = config
return header
}
You can adjust the attributed text more, reference
With RubyMotion / RedPotion, paste this into your TableScreen:
def tableView(_, willDisplayHeaderView: view, forSection: section)
view.textLabel.text = self.tableView(_, titleForHeaderInSection: section)
end
I think what's happening is that somewhere in there the text gets set to ALL CAPS. This little trick RESETS the text back to whatever it was originally. Works like a charm for me!
I have a UITableView with edit mode enabled in my -viewDidLoad method. My problem is that I don't need the three-line 'move' symbol on the right of each cell.
[tableview setEditing:YES];
tableview.allowsSelectionDuringEditing=YES;
I need to either have a transparent disclosure button, or hide the disclosure button altogether. I have tried:
cell.editingAccessoryType = UITableViewCellAccessoryNone;
But this has no effect. Can anybody help me with this?
You can do that in your cell subclass using the below method. I don't think it will work as-is , you need to amend it. But this should be your lead.
- (void)willTransitionToState:(UITableViewCellStateMask)state {
[super willTransitionToState:state];
//check whether you need it.
if ((state & UITableViewCellStateShowingEditControlMask) == UITableViewCellStateDefaultMask) {
for (UIView *subview in self.subviews) {
//check for reorder control. it checks for delete button.
if ([NSStringFromClass([subview class]) isEqualToString:#"UITableViewCellDeleteConfirmationControl"]) {
subview.hidden = YES;
subview.alpha = 0.0;
}
}
}
}
Modify tableView(_:canMoveRowAt) and return false, this is an UITableViewDataSource method.
func tableView(_ tableView: UITableView, canMoveRowAt indexPath: IndexPath) -> Bool {
return false
}
I have got an UITableView. How to simply fill it with three elements, for example "e1", "e2", "e3" ?
set DataSource of your table to your class and define in your class 3 methods:
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
return 1;
}
- (NSInteger)tableView:(UITableView*)tableView numberOfRowsInSection:(NSInteger)section {
return 3;
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
static NSString *cellId = #"identifier";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier: cellId];
if (cell == nil) {
cell = [[[UITableViewCell alloc] initWithFrame:CGRectZero reuseIdentifier:cellId] autorelease];
}
[cell setText:[NSString stringWithFormat:#"e%i",indexPath:[indexPath row]];
return cell;
}
UITableView is a component that rewards study. Read the local doc pages on UITableView and its datasource and delegate protocols.
There is a table view programming guide in the docs as well. It is a good read.
Some of it took me a while to grok and I am still refining my approach each time I implement one.
Using the API and implementing the methods it requires, you should be able to bend it to your will.
Hellra1ser's example should push you in the right direction. Lookup those methods first, you will be using them alot.
Code in swift 3.1:
Just in case if someone needs to copy paste it for the purpose of testing.
extension ViewController : UITableViewDataSource, UITableViewDelegate {
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return 50
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "cell", for: indexPath)
cell.textLabel?.text = "Test"
return cell
}
func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat {
return 60
}
}