I want to change the backgroundcolor of the Headerlines in my UITableView.
I've tried the following:
1: Set on Xcode-Designer in "TableView" -> "Section Index" -> "Background"
2: As Code in ViewDidLoad: TableView.TintColor = UIColor.Black and TableView.BackgroundColor = UIColor.Black;
Nothing happened, the Background is still Light Gray..
Everything I find here was with Xamarin.Forms, but i'm not using Xamarin.Forms!
You can use your own custom views and override method GetViewForHeader. You can refer to the following code,which could change the Header Background Color and text color:
public override UIView GetViewForHeader(UITableView tableView, nint section)
{
UIView view = new UIView();
view.BackgroundColor = UIColor.Yellow;
view.Frame = new CoreGraphics.CGRect(0, 100, 200, 50);
UILabel label = new UILabel();
label.Frame = view.Bounds;
label.Text = "test";
label.TextColor = UIColor.Red;
view.Add(label);
return view;
}
Related
I am trying to implement a custom Navigation Title on an iOS app.
The StoryBoard looks like this:
The place that I want to have the custom Navigation Title is the last view ( the message view ), and because I use an image and text this means that I need to have custom width and height. By needing this if I do in viewDidLoad:
let rect = CGRect(x: 0, y:0, width: 150, height: 88)
titleView = UIView(frame: rect)
......
titleView?.addSubview(imageView)
......
titleView?.addSubview(label)
navigationItem.titleView = titleView
The height of the title is blocked to 44pt.
But how I managed to do it is adding the subViews to the navigation bar:
var navigationBar: MessagesNavigationBar? {
guard let navigationBar = navigationController?.navigationBar as? MessagesNavigationBar else {
return nil
}
return navigationBar
}
And in viewDidLoad
let rect = CGRect(x: 0, y:0, width: 150, height: 88)
titleView = UIView(frame: rect)
......
titleView?.addSubview(imageView)
......
titleView?.addSubview(label)
navigationBar?.addSubview(titleView!)
But the problem is that I have to remove the subviews when I leave the view, otherwise whatever I add there will be present in the table view as well.
override func viewWillDisappear(_ animated: Bool) {
super.viewWillDisappear(animated)
if navigationBar != nil {
titleView?.removeFromSuperview()
}
}
Which kinda makes me feel that I'm not doing the right thing and I find difficult to add a fade out animation to those subViews when I leave the conversation. (i.e. native messages app on iOS).
So what is the right way of creating a custom Title Navigation Bar in iOS 12?
Scenes
Creating your custom titleView and assigning it to navigationItem.titleView is what you want. On older systems (pre iOS 11) you just might need to call sizeToFit() on the titleView.
This way you can create this titleView
Swift
override func viewDidLoad() {
super.viewDidLoad()
let imageView = UIImageView()
NSLayoutConstraint.activate([
imageView.heightAnchor.constraint(equalToConstant: 20),
imageView.widthAnchor.constraint(equalToConstant: 20)
])
imageView.backgroundColor = .red
let titleLabel = UILabel()
titleLabel.text = "Custom title"
let hStack = UIStackView(arrangedSubviews: [imageView, titleLabel])
hStack.spacing = 5
hStack.alignment = .center
navigationItem.titleView = hStack
}
Obj-C
- (void)viewDidLoad {
[super viewDidLoad];
UIImageView *imageView = [[UIImageView alloc] init];
[NSLayoutConstraint activateConstraints:#[
[imageView.heightAnchor constraintEqualToConstant:20],
[imageView.widthAnchor constraintEqualToConstant:20]
]];
imageView.backgroundColor = [UIColor redColor];
UILabel *titleLabel = [[UILabel alloc] init];
titleLabel.text = #"Custom title";
UIStackView *hStack = [[UIStackView alloc] initWithArrangedSubviews:#[imageView, titleLabel]];
hStack.spacing = 5;
hStack.alignment = UIStackViewAlignmentCenter;
self.navigationItem.titleView = hStack;
}
You might also need to have the right set of autolayout constraints or use UIStackView.
These lines have no effect on the size of a title view:
let rect = CGRect(x: 0, y:0, width: 150, height: 88)
titleView = UIView(frame: rect)
Instead (or in addition) give your title view a width constraint and a height constraint. That is how the runtime knows what size you want.
I've looked into many answers but either it's only UILabel or UIImage not both. So after trying to implement it I finally found that we cannot do two tableView.backgroundView. Here is what I've done so far:
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int
{
let noDataLabel: UILabel = UILabel(frame: CGRect(x: 0, y: 0, width: tableView.bounds.size.width, height: tableView.bounds.size.height))
let image = UIImage(named: "noData")
let noDataImage = UIImageView(image: image)
noDataImage.frame = CGRect(x: 0, y: 10, width: 20, height: 20)
if allData.count == 0 {
noDataLabel.isHidden = false
noDataImage.isHidden = false
noDataLabel.text = "No data added. Add new entry \nby pressing the add icon on top right."
noDataLabel.textColor = UIColor.black
noDataLabel.numberOfLines = 3
noDataLabel.backgroundColor = UIColor.white
noDataLabel.textAlignment = .center
//what to do from here
tableView.backgroundView = noDataImage
tableView.backgroundView = noDataLabel
//end
tableView.separatorStyle = .none
return 0;
}
else {
noDataLabel.backgroundColor = UIColor.clear
noDataLabel.isHidden = true
noDataImage.isHidden = true
tableView.backgroundView = nil
return allData.count
}
I want to show an image and below that image I want to show a UILabel. How can I achieve this?
You need to create a view with subviews your image and label
var backgroundView =UIView(frame: CGRectMake(0, 0, your_width, your_height))
backgroundView.addSubview(noDataImage)
backgroundView.addSubview(noDataLabel)
tableView.backgroundView=backgroundView;
Note: Adjust the frame of noDataImage and noDataLabel as per your use.
backgroundView Property
The background view of the table view.
Declaration
Swift
var backgroundView: UIView?
Objective-C
#property(nonatomic, readwrite, retain) UIView *backgroundView
Discussion
A table view’s background view is automatically resized to match the size of the table view. This view is placed as a subview of the table view behind all cells, header views, and footer views.
You must set this property to nil to set the background color of the table view.
I am using Swift 3, Xcode 8.2.
I've been able to create a label to cover the empty table view cells when there are none to display.
My code is below and it is located in the subclass of UITableViewController.
override func numberOfSections(in tableView: UITableView) -> Int {
// if there are scans to display...
if items.count > 0 {
tableView.backgroundView = nil
tableView.separatorStyle = .singleLine
return 1
}
else { // otherwise, return 0, remove cell lines, and display a Label
let rect = CGRect(x: 0,
y: 0,
width: tableView.bounds.size.width,
height: tableView.bounds.size.height)
let noScanLabel: UILabel = UILabel(frame: rect)
noScanLabel.text = "No Scans"
noScanLabel.textColor = UIColor.gray
noScanLabel.font = UIFont.boldSystemFont(ofSize: 24)
noScanLabel.textAlignment = NSTextAlignment.center
tableView.backgroundView = noScanLabel
tableView.separatorStyle = .none
return 0
}
}
Here is the result.
Looks fine. But how, do I make it such that I include another line of text with a downward arrow pointing at the raised center button. Something like "Click here to start a scan"?
I've tried adding new line characters to the noScanLabel.text field but that didn't work out. Any pointers in the right direction would be helpful.
The simple solution is to set numberOfLines to 0 on noScanLabel. This way, the new lines will show.
let noScanLabel: UILabel = UILabel(frame: rect)
noScanLabel.text = "No Scans"
noScanLabel.textColor = UIColor.gray
noScanLabel.font = UIFont.boldSystemFont(ofSize: 24)
noScanLabel.numberOfLines = 0
noScanLabel.textAlignment = NSTextAlignment.center
Note than in such cases, I would recommend, for better maintainability, to actually remove the TableView from the UIViewController (hence not inherit from UITableViewController) and replace it with an empty view when you detect no scans are available. This will make each state more independent of each other and make maintenance easier.
There are a few ways achieve your goal. There is a well known library called DZNEmptyDataSet for handling empty tableviews and collectionviews . https://github.com/dzenbot/DZNEmptyDataSet
The other way would be to create a uiview with your specified rect and then add two labels to that uiview. One would be your noScanLabel and the other would be a label or image containing your arrow. You can set the layout constraints as required so that the arrow appears pointing down.
This code seems to work well. Change constraints if needed
let rect = CGRect(x: 0, y: 0, width: tableview.bounds.size.width, height: tableview.bounds.size.height)
let noDataView = UIView(frame: rect)
let noScanLabel = UILabel()
noScanLabel.text = "No Scans"
noScanLabel.textColor = UIColor.gray
noScanLabel.font = UIFont.boldSystemFont(ofSize: 24)
noScanLabel.textAlignment = NSTextAlignment.center
let arrowLabel = UILabel()
arrowLabel.text = "Add Arrow Image to this label"
arrowLabel.textColor = UIColor.gray
arrowLabel.font = UIFont.boldSystemFont(ofSize: 24)
arrowLabel.textAlignment = NSTextAlignment.center
noScanLabel.widthAnchor.constraint(equalToConstant: 100)
arrowLabel.widthAnchor.constraint(equalToConstant: 50)
noDataView.addSubview(noScanLabel)
noDataView.addSubview(arrowLabel)
arrowLabel.translatesAutoresizingMaskIntoConstraints = false
noDataView.translatesAutoresizingMaskIntoConstraints = false
noScanLabel.translatesAutoresizingMaskIntoConstraints = false
self.tableview.addSubview(noDataView)
noDataView.isHidden = false
noDataView.centerXAnchor.constraint(equalTo: self.tableview.centerXAnchor).isActive = true
noDataView.centerYAnchor.constraint(equalTo: self.tableview.centerYAnchor).isActive = true
noScanLabel.centerXAnchor.constraint(equalTo: noDataView.centerXAnchor).isActive = true
noScanLabel.topAnchor.constraint(equalTo: noDataView.centerYAnchor).isActive = true
arrowLabel.centerXAnchor.constraint(equalTo: noDataView.centerXAnchor).isActive = true
arrowLabel.topAnchor.constraint(equalTo: noScanLabel.bottomAnchor).isActive = true
The other option is to set number of lines to zero as mentioned already
noScanLabel.numberLines = 0
You can take UIView and add your all UILabel and arrow Image on UIView and then assign that UIView to backgroundView of TableView.
Like this.
override func numberOfSections(in tableView: UITableView) -> Int {
// if there are scans to display...
if items.count > 0 {
tableView.backgroundView = nil
tableView.separatorStyle = .singleLine
return 1
}
else { // otherwise, return 0, remove cell lines, and display a Label
let rect = CGRect(x: 0,
y: 0,
width: tableView.bounds.size.width,
height: tableView.bounds.size.height)
let messageBaseView = UIView(frame: rect)
//Add your first label..
let noScanLabel: UILabel = UILabel()
noScanLabel.text = "No Scans"
noScanLabel.textColor = UIColor.gray
noScanLabel.font = UIFont.boldSystemFont(ofSize: 24)
noScanLabel.textAlignment = NSTextAlignment.center
messageBaseView.addSubView(noScanLabel)
//Add your second label.. and your arrow image here on messageBaseView
//Assign messageBaseView to backgroundView of tableView
tableView.backgroundView = messageBaseView
tableView.separatorStyle = .none
return 0
}
}
Is it possible to adjust the font size of the navigation bar's title to fit the text?
You can create a UILabel and set it to UINavigationItem's titleView. See Apple doc: https://developer.apple.com/library/ios/documentation/UIKit/Reference/UINavigationItem_Class/#//apple_ref/occ/instp/UINavigationItem/titleView
For the created UILabel, you can set the adjustsFontSizeToFitWidth & minimumScaleFactor properties to let it fit the title. Doc:
https://developer.apple.com/library/prerelease/ios/documentation/UIKit/Reference/UILabel_Class/#//apple_ref/occ/instp/UILabel/adjustsFontSizeToFitWidth
Some codes:
- (void)setMyTitle:(NSString *)title
{
UILabel *titleLabel = [[UILabel alloc] initWithFrame:CGRectMake(0, 0, self.navigationController.view.bounds.size.width - 100, 44)];
titleLabel.text = title;
titleLabel.font = [UIFont systemFontOfSize:16];
titleLabel.textColor = ...
...
self.navigationItem.titleView = titleLabel;
}
Try the following in viewDidLoad:
NSDictionary *attributes = #{ NSFontAttributeName: [UIFont fontWithName:#"HelveticaNeue-Bold" size:14] };
[self.navigationController.navigationBar setTitleTextAttributes:attributes];
NOTE: The downside to this solution is that you have to know the font size up front and set it manually. I'm not sure if you can set the navigation bar's title label to automatically change the font size to fit the text.
EDIT:
Turns out you can set the navigation bar's label to resize the font size dynamically
Swift 5
private var isFirst = true
override func viewDidLayoutSubviews() {
super.viewDidLayoutSubviews()
guard isFirst else {
return
}
isFirst = false
// Adjust Navigation Title by text
if let navigationController = navigationController {
let bar = navigationController.navigationBar
var minX: CGFloat = 0
var maxX: CGFloat = bar.bounds.width
if let lastLeft = navigationItem.leftBarButtonItems?.last, let leftView = lastLeft.view, let buttonBarStackViewFrame = leftView.superview?.frame {
minX = buttonBarStackViewFrame.maxX
}
if let firstRight = navigationItem.rightBarButtonItems?.first, let rightView = firstRight.view, let buttonBarStackViewFrame = rightView.superview?.frame {
maxX = buttonBarStackViewFrame.minX
}
let titleLabel = UILabel(frame: CGRect(x: 0, y: 0, width: maxX - minX, height: bar.bounds.height))
titleLabel.text = LocStr(.favorite_master_title)
titleLabel.adjustsFontSizeToFitWidth = true
titleLabel.minimumScaleFactor = 0.3
titleLabel.textColor = UIColor.white
titleLabel.textAlignment = .center
if UIDevice.current.modelName.contains(PLUS) {
titleLabel.font = UIFont(name: GENERAL_FONT_NAME, size: PLUS_NAVIGATION_BAR_TITLE_FONT)!
} else {
titleLabel.font = UIFont(name: GENERAL_FONT_NAME, size: GENERAL_NAVIGATION_BAR_TITLE_FONT)!
}
navigationItem.titleView = titleLabel
}
}
with a Extension
extension UIBarButtonItem {
var view: UIView? {
return value(forKey: "view") as? UIView
}
}
I have a ViewController.
I added a Title to the Viewcontroller.
Its a variable.
var Title: String! = "🎯"
override func viewDidLoad() {
super.viewDidLoad()
self.title = Title
}
Is there a way, to make the font bigger?
This way you can customise your navigation title:
self.title = "🎯"
var attributes = [NSFontAttributeName: UIFont(name: "Avenir", size: 20)!] //change size as per your need here.
self.navigationController?.navigationBar.titleTextAttributes = attributes
Make a Title View Label and assign it to the navigation item.
code for it is:
var tlabel = UILabel(frame: CGRectMake(0, 0, 300, 40))
tlabel.text = self.navigationItem.title;
tlabel.textColor = UIColor.whiteColor()
tlabel.backgroundColor = UIColor.whiteColor()
tlabel.adjustsFontSizeToFitWidth = true
self.navigationItem.titleView = tlabel
Here is the possible work around. You can assign any UIView to a navcontroller's title area.
Create a UILabel and set its font and size anyway you want, then assign it to the UIViewController's navigationItem.titleView property. Make sure the UILabel's backgroundColor is set to clearColor.
UILabel *labelTitle = UILabel(frame: CGRectZero);
labelTitle.text = "Title";
labelTitle.font = UIFont(name: "Your-Font-Name", size: SIZE)
labelTitle.text.textAlignment = NSTextAlignment.Center
self.navigationItem.titleView = labelTitle;