Ich erkläre meine .h-Datei folgendermaßen:

#import <UIKit/UIKit.h>

@interface NavigationTripViewController : UIViewController <UIPickerViewDelegate, UIPickerViewDataSource>{
    NSArray *questionTitleTrip;
    NSArray *questionDescTrip;
    NSMutableArray *answerTrip;
    NSMutableArray *pickerChoices;
    int questionInt;
    int totalInt;
    IBOutlet UILabel *questionNum;
    IBOutlet UILabel *questionTotalNum;
    IBOutlet UILabel *recordType;
    IBOutlet UITextView *questionDes;
    IBOutlet UIView *answerView;
    IBOutlet UIButton *preButton;
    IBOutlet UIButton *nextButton;
    UITextField *text;
    UIPickerView *picker;

}
@property (retain, nonatomic) NSArray *questionTitleTrip;
@property (retain, nonatomic) NSArray *questionDescTrip;
@property (retain, nonatomic) NSMutableArray *answerTrip;
@property (retain, nonatomic) NSMutableArray *pickerChoices;
@property (retain, nonatomic) IBOutlet UILabel *questionNum;
@property (retain, nonatomic) IBOutlet UILabel *questionTotalNum;
@property (retain, nonatomic) IBOutlet UILabel *recordType;
@property (retain, nonatomic) IBOutlet UITextView *questionDes;
@property (retain, nonatomic) IBOutlet UIView *answerView;
@property (retain, nonatomic) IBOutlet UIButton *preButton;
@property (retain, nonatomic) IBOutlet UIButton *nextButton;
@property (retain, nonatomic) UITextField *text;
@property (retain, nonatomic) UIPickerView *picker;
-(IBAction)clickPre;
-(IBAction)clickNext;
@end

Und meine .m-Datei hier so:

#import "NavigationTripViewController.h"
#import <QuartzCore/QuartzCore.h>

@interface NavigationTripViewController ()

@end

@implementation NavigationTripViewController

@synthesize questionTitleTrip,questionDescTrip,answerTripl,pickerChoices,questionNum,questionTotalNum,recordType,questionDes,answerView,preButton,nextButton,text,picker;

Alle meine Variablen in der@synthesize die Warnungen erhalten:

Die Autosynthesized-Eigenschaft 'myVar' verwendet die synthetisierte Instanzvariable '_myVar', nicht die vorhandene Instanzvariable 'myVar'.

Auch die Variablen und Klassennamen inviewDidLoad Nicht in Farben anzeigen, nur in schwarz anzeigen. In anderen View Controllern gibt es keine derartigen Warnungen. Wie können diese Probleme behoben werden?