Impossibility to show in a label the text of an object - xcode

Question

My objective is to show in a label the text of an object of a custom class called Files. Here is Files.h :
#import <Foundation/Foundation.h>
#interface Files : NSObject
#property (nonatomic, retain) NSString *title;
#property (nonatomic, retain) NSString *text;
#end
This is Files.m :
#import "Files.h"
#implementation Files
#dynamic title;
#dynamic text;
#end
Here is the .h file of my app. the label is called trackName:
#import <UIKit/UIKit.h>
#import "Files.h"
#interface FirstViewController : UIViewController
{
Files *plainpalais;
}
#property (weak, nonatomic) IBOutlet UILabel *trackName;
-(Files*) chooseFile;
#end
This is the .m file of the app:
#import "FirstViewController.h"
#interface FirstViewController ()
#end
#implementation FirstViewController
#synthesize trackName;
-(Files*)chooseFile
{
return plainpalais;
}
- (void)viewDidLoad
{
[super viewDidLoad];
plainpalais.text=#"hello";
plainpalais.title=#"plainpalais";
trackName.text=plainpalais.title;
// Do any additional setup after loading the view, typically from a nib.
}
- (void)viewDidUnload
{
[self setTrackName:nil];
[super viewDidUnload];
// Release any retained subviews of the main view.
}
- (BOOL)shouldAutorotateToInterfaceOrientation: (UIInterfaceOrientation)interfaceOrientation
{
if ([[UIDevice currentDevice] userInterfaceIdiom] == UIUserInterfaceIdiomPhone) {
return (interfaceOrientation != UIInterfaceOrientationPortraitUpsideDown);
} else {
return YES;
}
}
#end
The problem is that the label trackName doesn't show plainpalais...
Thanks for help !
PS: I'm a beginner so this is probably a basic mistake.

Answer 1

You have used #dynamic in your Files.m implementation which tells the compiler that you'll provide getters/setters for these properties at a later time, i.e. using the Objective-C runtime.
I suspect you want to use #synthesize rather than #dynamic. For example,
#import "Files.h"
#implementation Files
#synthesize title;
#synthesize text;
#end
Also you haven't actually created a Files object in the code you have given us. The chooseFile method appears to be returning a nil object (assuming you haven't initialised plainpalais somewhere else). Perhaps you should initialise plainpalais in an init method, e.g.
- (id)init {
self = [super init];
if (self) {
plainpalias = [[Files alloc] init];
}
return self;
}
Don't forget to release this object in dealloc (if you aren't using ARC).