os x nstextfield validation

os x nstextfield validation

By : N Kothari
Date : December 05 2020, 12:22 PM
help you fix your problem Generic solution (work with or without bindings) One way of dealing with this is based on the response here
Basically you use the controlTextDidChange(notification:) delegate method of NSTextField and you implement your validation code in it.
code :
 override func controlTextDidChange (notification: NSNotification) {
    guard let textField = notification.object as? NSTextField else { return }

    // test here, replace the dummy test below with something useful
    if textField.stringValue != "expected value" {
        myTextFieldOutlet.backgroundColor = NSColor.red
        myErrorLabelOutlet.stringValue = "Error !!!"
    } else {
        // everything OK, reset the background color and error label to the normal state
override func validateValue(_ ioValue: AutoreleasingUnsafeMutablePointer<AnyObject?>, forKey inKey: String) throws {
    // test here, replace the dummy test below with something useful
    if roll_rate > 10.0 {
        throw NSError(domain: "your-domain", code: 100, userInfo: [NSLocalizedDescriptionKey: "Error, roll rate too high"])

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NSTextField setStringValue: append strings to NSTextField

NSTextField setStringValue: append strings to NSTextField

By : Naveen Rai
Date : March 29 2020, 07:55 AM
Hope this helps I have some 10 buttons with different names each.On selecting each button I need to append the button's title to NSTextField without removing the older string. , How about something like:
code :
[resultField setStringValue: 
    [NSString stringWithFormat: @"%@ %@", [resultField stringValue], [sender title]];
NSTextField validation and NSSearchField save it's value to recent history on NSButton click

NSTextField validation and NSSearchField save it's value to recent history on NSButton click

By : Lena Hut
Date : March 29 2020, 07:55 AM
This might help you After asking the question I've tried the "last option"... and it worked!
this is the code for - (IBAction)Btn_SearchAction:(id)sender
code :
NSResponder *firstResponder = [[NSApp keyWindow] firstResponder];
if ([firstResponder isKindOfClass:[NSText class]] && [(NSText *)firstResponder delegate] == TextF_ResultLimit) {
    NSLog(@"SearchDelegate::Btn_SearchAction TextF_ResultLimit has focus, let's save it's value");
    [TextF_ResultLimit performClick:self];

NSLog(@"SearchDelegate::Btn_SearchAction SearchF_Name saving search value to recent history");
[SearchF_Name performClick:self];
NSTextField - Input validation with KVO?

NSTextField - Input validation with KVO?

By : Marcus Ghattas
Date : March 29 2020, 07:55 AM
it should still fix some issue To make bindings validate values automatically there is mechanism of Key-Value Validation.
code :
- (BOOL) validateValue:(inout id *)ioValue forKey:(NSString *)inKey error:(out NSError **)outError;
- (BOOL) validateText:(inout id *)ioValue error:(out NSError **)outError;
How can I make a NSTextfield with left or right indicator for validation?

How can I make a NSTextfield with left or right indicator for validation?

By : user2706452
Date : March 29 2020, 07:55 AM
it should still fix some issue A text field control is a view where the drawing is all done with an NSTextFieldCell. What you'd need to do is subclass NSTextFieldCell, and customize the drawing. Look at NSCell's API and you'll see there's a drawWithFrame:inView: method which is what does all of the drawing for the entire field. Various other methods of NSCell are used in this process.
Unfortunately some of how the drawing is done is a bit private and not eeeasily fiddled with, but the main thing is drawWithFrame:inView: will draw the background and then call drawInteriorWithFrame:inView: to draw the text. Off the top of my head, I can't remember if NSTextFieldCell uses titleRectForBounds: to determine what the text's bounds are, but I'm pretty sure it is. So you could override that to return a narrower rectangle, leaving room to either draw the validation icon with the cell itself, or use a subview.
NSTextField with built in validation

NSTextField with built in validation

By : Matheus Hauder
Date : March 29 2020, 07:55 AM
around this issue I have in my app an NSTextField for creating a new file. I would like to have this textfield smart enough to show a small icon which show if the currently entered filename is valid (not yet exists) or not. This icon should also change when the textfield contents change. , This is the method you are looking for:
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