如何修复"Autosynthesized属性'myVar'的警告将使用合成的实例变量'_myVar',而不是现有的实例变量'myVar'"？

Question

我声明我的.h文件是这样的:

#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文件就像这样:

#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;

我的所有变量都@synthesize收到警告:

自动合成属性'myVar'将使用合成的实例变量'_myVar',而不是现有的实例变量'myVar'

此外,使用的变量和类名viewDidLoad不以颜色显示,只显示为黑色.在其他视图控制器中,没有这样的警告.如何解决这些问题？

Answer 1

编辑:基本上对于所有意图和目的,你应该建立一个足够新的XCode来使用新的行为,在该解决方案中,你通常只是从文件中的@interface块中删除ivar .h...如果由于某种原因你需要直接访问ivar你现在可以在@implementation块中声明它...并使用@synthesize var或@synthesize var=_var

OGPost:

为了让它消失你可以去所有新学校放弃iVar,或者你可以去所有的旧学校并@synthesize someIvar在你的@implementation街区添加一个.