ios - 如何解决 "Autosynthesized property ' myVar' will use synthesized instance variable '_myVar' not existing instance variable 'myVar' "的警告？

Question

我这样声明我的 .h 文件:

#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

我的 .m 文件是这样的:

#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;

我在 @synthesize 中的所有变量都收到警告:

Autosynthesized property 'myVar' will use synthesized instance variable '_myVar', not existing instance variable 'myVar'

另外，viewDidLoad中使用的变量名和类名不显示颜色，只显示黑色。在其他 View Controller 中，没有这样的警告。如何解决这些问题？

Answer 1

编辑: 基本上出于所有意图和目的，您应该构建足够新的 XCode 以使用新行为，在该解决方案中，您通常只需从 .h 中的 @interface block 中删除 ivar 文件...如果出于某种原因您确实需要直接访问一个 ivar，您现在可以在 @implementation block 中声明它...并使用 @synthesize var 或 @synthesize var=_var

OGPost:

要消除这种情况，您可以去所有新学校并放弃 iVar，或者您可以去所有旧学校并在您的 @implementation 中添加一个 @synthesize someIvar堵塞。