CODEWITHSUNDEEP
objective-c
angry kiwi
angry kiwi

Reputation: 11495

Objective-C get slider value and display it on text box

I got a very simple app. it gets slider value and display it on text box. The interface and implementation is as follow:

#import <Foundation/Foundation.h>

@interface HelloWorld : NSObject
@property (assign) IBOutlet NSTextField *Tf;
@property (assign) IBOutlet NSSliderCell *Sc;

@end


#import "HelloWorld.h"

@implementation HelloWorld
@synthesize Tf;
@synthesize Sc;
- (IBAction)Pressed:(id)sender {
    [Tf setStringValue:@"Hey"];
}
- (IBAction)Scroll:(id)sender {
    [Tf setStringValue: [Sc indexOfTickMarkAtPoint]];
}

@end

The UI:

enter image description here

Problem: The app crashes when I move the slider.

Upvotes: 0

Views: 1490

Answers (2)

bigkm
bigkm

Reputation: 2277

Whats happening is its an NSInteger and not a pointer to an Object

[Tf setIntegerValue:[Sc indexOfTickMarkAtPoint]];

Upvotes: 1

Phillip Mills
Phillip Mills

Reputation: 31026

indexOfTickMarkAtPoint returns NSInteger but setStringValue: wants (somewhat obviously) a string. Look at the documentation for NSString method stringWithFormat: for a description of how to do the conversion.

Something like:

[Tf setStringValue:[NSString stringWithFormat:@"%d", [Sc indexOfTickMarkAtPoint]]];

Upvotes: 1

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