Nstextfield, Change Text in Swift

NSTextField, Change text in Swift

NSTextField is different from a UITextField. It doesn't have a text property. It does however inherit from NSControl which has a stringValue property.

sumlab.stringValue = "\(result.sum)"

Change the text in a NSTextField programmatically?

This will work:

[field setStringValue:[NSString stringWithFormat:@"%i",number]];

If it doesn't do anything, it probably means field isn't set to point to the field (e.g. by making a connection in Interface Builder).

Observe text change in NSTextView

Just set the text view's delegate. The delegate must coform to NSTextViewDelegate. NSTextViewDelegate inherits from NSTextDelegate (see relationships and NSTextView is a subclass of NSText). NSTextDelegate defines method

optional func textDidChange(_ notification: Notification)

Text change notification for an NSTextField

If you just want to detect when the value of a text field has changed, you can use the controlTextDidChange: delegate method that NSTextField inherits from NSControl.

Just connect the delegate outlet of the NSTextField in the nib file to your controller class, and implement something like this:

- (void)controlTextDidChange:(NSNotification *)notification {
    NSTextField *textField = [notification object];
    NSLog(@"controlTextDidChange: stringValue == %@", [textField stringValue]);
}

If you're creating the NSTextField programmatically, you can use NSTextField's setDelegate: method after creation to specify the delegate:

NSTextField *textField = [[[NSTextField alloc] initWithFrame:someRect] autorelease];
[textField setDelegate:self]; // or whatever object you want

Delegation is one of the fundamental design patterns used throughout Cocoa. Briefly, it allows you to easily customize the behavior of standard objects (in this case, user interface objects) without the complexity involved in having to subclass the object to add that additional behavior. For example, another lower-level way to detect when the text in a textfield has changed might be to create your own custom NSTextField subclass in which you override the keyDown: method that NSTextField inherits from NSResponder. However, subclassing like that is difficult because it can require that you have an intimate knowledge of the object's inheritance hierarchy. For more info, definitely check out the following:

Cocoa Fundamentals Guide: Delegates and Data Sources

Regarding what id <NSTextFieldDelegate> means: it means a generic object (id) that declares itself as conforming to the <NSTextFieldDelegate> protocol. For more info on protocols, see The Objective-C Programming Language: Protocols.

Sample GitHub project at: https://github.com/NSGod/MDControlTextDidChange

Change NSTextField text color with fade animation - Cocoa

Here is the outline of one possible solution:

• Subclass NSAnimation, say with TextColorAnimation
• Have the init take the NSTextField and final NSColor
• Override currentProgress as per NSAnimation docs to (a) call the super implementation and (b) set the intermediate color and display the NSTextField
• Use NSColor.blend(...) to determine the intermediate color
• start this NSAnimation

You should get a nice smooth color transition. HTH

How to Change NSTextField Font Size When Used in SwiftUI

This is a particularly weird one:

struct FancyTextField: NSViewRepresentable {
  @Binding var text: String
  func makeNSView(context: Context) -> NSTextField {
    let textField = MyNSTextField()
    textField.customSetFont(font: .systemFont(ofSize: 50))
    return textField
  }
  func updateNSView(_ nsView: NSTextField, context: Context) {
    nsView.stringValue = text
  }
}

class MyNSTextField : NSTextField {
    func customSetFont(font: NSFont?) {
        super.font = font
    }
    
    override var font: NSFont? {
        get {
            return super.font
        }
        set {}
    }
}

Maybe someone will come up with a cleaner solution to this, but you're right -- the normal methods for just setting .font on the NSTextField do not seem to work here. It seems to be because outside elements (the debugger doesn't give me a good hint) are trying to set the font to system font size 13.

So, my solution is to subclass NSTextField and make the setter for font not responsive. Then, I define a custom setter method, so the only way to get up to the real setter is through my custom method.

A little hacky, but it works.

How to change insertion text (cursor) for NStextField? for os x swift 2

Never mind found the answer by extending NSTextField class and calling the function manually

extension NSTextField {
   public func customizeCaretColor(caretColor: NSColor) {
      let fieldEditor = self.window?.fieldEditor(true, forObject: self) as! NSTextView
      fieldEditor.insertionPointColor = caretColor
   }
}

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