I have a UITextField on main ViewController and once I touch down the Textfield UIPopOverController with UIPickerView opens which is from other class.now I want when I select any value in Pickerview of popovercontroller the selected value should display as UITextfield text and In main Viewcontroller when I pick any value in Pickerview a method calls to print UITextfield text but textfield.text comes always null. but I used the Appdelegate sharedAppdeledatewhich give me value on tapping on pickerview but when i used it to text the textfield it gets null. what should I Do.
and I want to add value on the UITextfield without removing the top view which is pickerview
pass your parent class object to your popovercontroller class and you'll be able to have access of the parent class property in child class and then you'll be able to set your textfield value selection on picker from popovercontroller class
Related
I'm showing a UIButton for the rightView property of a UITextField. I only want to show this button if the text is empty and the user is not editing.
I'm setting the rightViewMode property to UITextFieldViewModeUnlessEditing which hides the rightView if I'm editing but I also want the right view to hide if there is text in the text field even if it's not selected. I'm not sure how to setup this behavior.
I want to replace the default keyboard of a UITextField with a custom keyboard. So I created a new subclass of a UIViewController with a xib-file (the other way like creating both files seperately and setting the File's Owner doesn't work either).
Then I added a button to the KeyboardView and connected it to an IBAction. After that I set the textfields inputView to the new view like this:
override func viewDidLoad() {
let keyboardVC = KeyboardViewController()
textField.inputView = keyboardVC.view
keyboardVC.view.autoresizingMask = .FlexibleHeight
keyboardVC.delegate = textField
}
It's working and the custom keyboard shows up, but if I touch the button, the IBAction is not called. What's the problem in my setup? (I checked some examples and they all do it the same way).
UPDATE:
I now removed the ViewController and subclassed the UIView. Now the actions are working. Why isn't it working with a ViewController?
Since no one holds the UIViewController- there is no reference to it after the viewDidLoad() ended, it is released from the memory.
When the button is pressed, the view controller that should response to the action is not exist -> you are holding only the view of the view controller as the textField.inputView.
The headline seems lengthy but what I'm trying to do is quite simple.
I have a couple of identical buttons lined in a row and set their tags to 0...n. Clicking on any of them (the 2nd for example) would bring up a popover view in which there are several buttons representing different options (A, B, C, D). What I want to do is to turn the 2nd Button's title to B if we click on option B.
The problem is that the popover view does not know which Button presented it, since all popoverViews are instances of the same UIViewController class. So I am thinking of distinguishing the n buttons by setting their tags to different values. However, I don't know how to get the UIButton's tag from a button inside the popover this UIButton presented.
Many thanks in advance!
This is how I will solve this in swift. I will declare a delegate in the popoverViewController and have a method e.g
protocol popOverViewControllerDelegate: class {
func popOverViewController(controller: PopOverViewController,
didSelectItem buttonTitle: String)
}
then I will add a target action to the UIButton in the popOver
button.addTarget(self, action: "selected:",forControlEvents:.TouchUpInside)
the select method will have sender passed to it
func selected(sender:UIButton){
delegate?.popOverViewController(self, didSelectItem: sender.currentTitle)
//dismiss viewcontroller
}
remember to declare
weak var delegate: popOverViewControllerDelegate!
now have the viewcontroller that called the popOver, subclass to this delegate and implement it's method. Whenever a button in the popOver is selected, this method will be called and the currentTitle of the method will be passed. You can now use that to set the currentTitle of the button that called the popOver.
In case you need further help with the last part, please ask.
I've fixed the problem by adding a property tagNumberso that after instantiating the popoverViewController's class, I set the instance's tagNumber to the sender's tag. Then I send the tagNumber back together with sender.currentTitle. This way, the presenter of the popover could know both the title and tag number of the UIButton.
In a UIViewController there is a UITableView which consists custom UITableViewCell with a UIButton.
When the user clicks the button (in the custom UITableViewCell), I want to display a message in the hosting UIViewController - what is the right way to achieve that? How should I notify the UIViewController that the button was clicked?
You should use delegation to tell the UIViewController that something happened in the cell.
I'm not exactly sure what kind of message you are referring to but if you mean a you want to show a popup just create a UIAlertView and show it when the button is clicked in the cell.
However, if you mean change a UIlabel text or whatever as a message on the ViewController you can always pass whatever you need to change into the TableView and Cell or the UIViewController itself into it.
I usually create a method on the custom cells class and pass it whatever I need into the custom TableView's constructor. Then in the TableView's GetCell() method pass whatever I need to change into that method I created on the cell and save it as a variable on the cell.
If you've initiated your UITableViewCell, and added a button to the cell, you can use a Delegate when the button is clicked, something like this:
UIButton button = new UIButton (cell.Bounds.X, cell.Bounds.y, cell.Bounds.Width, cell.Bounds.Height);
button.TouchUpInside += (object sender, EventArgs e) =>
{
label.text = "Blablabla";
};
Where the label is, is up to you. I hope this helps, good luck!
I have a view controller that displays various UITextfields to edit information. For one UITextfield I need a picker wheel to select predefined statuses.
Problem is I don't have enough space to integrate a picker wheel, is there a possibility to make it appear only when the text box is selected?
You could set the UIPickerView as the UITextField's inputView.
This will ensure that the picker is shown automatically when the text field gets focus, and hides it when lost.
E.g.
myTextField.inputView = self.myPickerView;
See the documentation on this property.
Assuming your "picker wheel" is a UIView, just hook up your controller as the UITextField's delegate and implement the following:
- (void)textFieldDidBeginEditing:(UITextField *)textField {
self.pickerWheel.hidden = NO;
}
You need to call your UIPicker in (BOOL)textFieldShouldBeginEditing:
- (BOOL)textFieldShouldBeginEditing:(UITextField *)textField{
if (textField==self.yourtextfield) {
//call your wheel in here
}
}
Look at
How to Show UIPickerView when selecting UITextField