macOS changing NSTextView string value

[abcdefg12345]

I'm trying to use buttons to change the text on text view but i keep getting errors with this method

AppDelegate.h

#import <Cocoa/Cocoa.h>

@interface AppDelegate : NSObject <NSApplicationDelegate>
@property (assign) IBOutlet NSWindow *window;

@property (weak) IBOutlet NSButton *button1;
@property (weak) IBOutlet NSButton *button2;
@property (weak) IBOutlet NSButton *button3;
@property (weak) IBOutlet NSTextView*textfield;

AppDelegate.m

#import "AppDelegate.h"

@implementation AppDelegate

- (void)applicationDidFinishLaunching:(NSNotification *)aNotification
{
    // Insert code here to initialize your application
}


- (IBAction)button1:(id)sender{
   _textfield.stringValue = @"exampletext1";
}

- (IBAction)button2:(id)sender{
    _textfield.stringValue = @"exampletext2";
}

- (IBAction)button3:(id)sender{
    _textfield.stringValue = @"exampletext3";
}

but i keep getting errors:

@property (weak) IBOutlet NSTextView*textfield;

synthesizing__weak instance variable of type NSTextview*', which does not support weak references

- (IBAction)button1:(id)sender{
   _textfield.stringValue = @"exampletext3";
}

- (IBAction)button2:(id)sender{
    _textfield.stringValue = @"exampletext2";
}

- (IBAction)button3:(id)sender{
    _textfield.stringValue = @"exampletext3";
}

property 'stringValue' not found on object of NSTextview

and if i change

@property (weak) IBOutlet NSTextView*textfield;

to

@property (weak) IBOutlet NSTextField *textfield;

everything works but i can't link it with text view it only links with text fields and labels

 

[abcdefg12345]

i found another method that is working but i keep on getting warning unused variable 'mystring'

testAppDelegate.h

#import <Cocoa/Cocoa.h>

@interface testAppDelegate : NSObject <NSApplicationDelegate> {
    
    IBOutlet NSTextView *textView;
}
@property (assign) IBOutlet NSWindow *window;

- (IBAction)button1:(id)sender;
- (IBAction)button2:(id)sender;
@end

testAppDelegate.m

#import "testAppDelegate.h"

@implementation testAppDelegate

@synthesize window;

- (void)applicationDidFinishLaunching:(NSNotification *)aNotification {
    // Insert code here to initialize your application
}

-(void)awakeFromNib
{
    NSString *myString = @"this is a string";
    [textView insertText:myString];
}


- (IBAction)button1:(id)sender {
    [textView setString:@"String number 1111111"];
    NSString *myString = [textView string];
}

- (IBAction)button2:(id)sender {
    [textView setString:@"String number 2222222"];
    NSString *myString = [textView string];
}
@end

warnings are from

 NSString *myString = [textView string];

unused variable 'myString'

 

[robbieduncan]

Explain the variable scoping. If you understand this you will understand why you have an error.

 

[Madd the Sane]

NSTextView can't be weak-referenced in ARC. Instead, use unsafe_unretained.

 

[abcdefg12345]

.h

#import <Cocoa/Cocoa.h>

@interface testAppDelegate : NSObject <NSApplicationDelegate> {
    
    IBOutlet NSTextView *textView;
}
@property (assign) IBOutlet NSWindow *window;

- (IBAction)button1:(id)sender;
- (IBAction)button2:(id)sender;
@end

.m

#import "testAppDelegate.h"

@implementation testAppDelegate

@synthesize window;

- (void)applicationDidFinishLaunching:(NSNotification *)aNotification {
    // Insert code here to initialize your application
}

-(void)awakeFromNib
{
    NSString *myString = @"this is a string";
}


- (IBAction)button1:(id)sender {
    [textView setString:@"whatever"];
}

- (IBAction)button2:(id)sender {
    [textView setString:@"abcdefg"];
}
@end

just had to get rid of

[textView insertText:myString];

and problem solved