ios/objective c/singleton:将用户标识存储在会话变量中 [英] ios/objective c/singleton: Storing userid in session variable

问题描述

我在单例中(针对用户ID)定义了一个NSInteger，并在另一个类中对其进行访问.但是，尽管我设法摆脱了错误消息，但仍可以构建，但应用程序在碰到行时便崩溃了.

I defined an NSInteger in a singleton (for userid) and access it in another class. However, while I have managed to get rid of error messages so it builds, the app crashes when it hits line.

这是初始定义；

Session.h

@interface Session : NSObject
@property (assign,nonatomic) NSInteger *userid;
+ (IDSession *)sharedInstance;

Session.m

@implementation Session
+ (Session *)sharedInstance {
    static Session *session;
    if (!session){
        session = [[Session alloc] init];
        NSInteger *userid=1;
        //include this class in other class and reference userid with [Session sharedInstance].userid
    }
    return session;
}

试图在导入到该类之上的其他类中获取会话

Attempt to get session in other class that imports above class

in save method:

 NSInteger *number =[Session sharedInstance].userid;//crashes here log says (lldb)

将对解决此问题的任何建议表示感谢.

Would appreciate any suggestions on how to fix this.

谢谢.

推荐答案

以下使用NSString而不是数字并设置局部变量而不是属性的代码有效:

The following code using NSString instead of numbers and setting a local variable rather than a property works:

Session.h
@interface IDSession : NSObject
@property (readonly, copy) NSString *userid;
+ (IDSession *)sharedInstance;  
@end

Session.m
#import "IDSession.h"
@interface IDSession()
@property (readwrite,copy)NSString * userid;

@end

@implementation IDSession

+ (IDSession *)sharedInstance {
    static IDSession *session;
    if (!session){
        session = [[IDSession alloc] init];
        //include this class in other class and reference userid with [IDSession sharedInstance].userid
        NSString * userid = @"1";
    }
    return session;
}
@end
in retrieving class.

#import "session.h"

   NSString *userid =[Session sharedInstance].userid;
    NSLog(@"userid retrieved from session variable is %@",userid);

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