Iphone 除NSDictionary之外的其他类可以访问的所有类属性？有人知道为什么吗？

在过去的几天里，我到处寻找，除了从我头上拔下的几根头发外，几乎没有什么可看的

我试图通过@properties将对象数据从一个类传递到另一个类，所有这些都可以很好地处理我的NSString对象。但我无法访问我的NSDictionary和/或NSMutableDictionary数据。事实上，我曾尝试将我的NSDictionary切换到NSMutableDictionary，在retain和copy之间切换，以及其他一些变体，但都无济于事

这里有一个故障。我要传递的NSDictionary对象是projectMessagesList。我希望这些代码足够简短，但也能提供足够的信息：

DBS项目.h

对象类末尾的NSLog正确地打印出控制台中的消息

现在让我们跳到我的另一个类，ViewController：

dbsdailViewController.h

dbsdailViewController.m

这会正确地打印出我的项目代码，但projectMessagesList my NSDictionary为空

---

所以，除了我的字典，我可以访问所有内容。有人对我的错误有什么建议吗？非常感谢你

更改代码，这是一个非常简单的错误

-(id)init {
    self = [super init];
    if (self) {
        [self setProjectCode:@"CODE"];
        //you are not assigning the object into ivar..you are creating a local object
        //NSMutableDictionary *projectMessagesList = [[NSMutableDictionary alloc] init];
        //into
        projectMessagesList = [[NSMutableDictionary alloc] init];
        DBSMessage *message = [[DBSMessage alloc] init];

        [message setMessageDate:[NSDate date]];
        [message setMessageText:[NSString stringWithFormat:@"This is a message"]];
        [projectMessagesList setObject:message forKey:@"msg"];
        NSLog(@"%@", [projectMessagesList objectForKey:@"msg"]);
        }
    }
    return self;
}

---

用手拍脸。哇！非常感谢。这很有道理，也解释了我为什么错过了它。我看得太深了，错过了显而易见的东西。我确实把它改为：self.projectMessageList，因为我的@synthesis设置为_projectMessagesList，但你搞定了。谢谢

@implementation DBSProject
@synthesize projectMessagesList=_projectMessagesList;
-(id)init {
    self = [super init];
    if (self) {
        [self setProjectCode:@"CODE"];
        NSMutableDictionary *projectMessagesList = [[NSMutableDictionary alloc] init];
        DBSMessage *message = [[DBSMessage alloc] init];

        [message setMessageDate:[NSDate date]];
        [message setMessageText:[NSString stringWithFormat:@"This is a message"]];
        [projectMessagesList setObject:message forKey:@"msg"];
        NSLog(@"%@", [projectMessagesList objectForKey:@"msg"]);
        }
    }
    return self;
}

#import "DBSProject.h"
#import "DBSMessage.h"

@interface DBSDetailViewController : UIViewController

@property (strong, nonatomic) DBSProject *myProject;
@property (strong, nonatomic) IBOutlet UILabel *clientCode;
@end

- (void)viewWillAppear:(BOOL)animated
{
    [super viewWillAppear:animated];

    NSString *clientProjectString = [NSString stringWithFormat:@"%@ %@", self.myProject.clientCode, self.myProject.projectCode];

    self.title = self.myProject.projectCode;
    self.projectCode.text = clientProjectString;
    self.projectDescription.text = self.myProject.projectDescription;
    self.projectBudget.text = self.myProject.projectBudget;
    self.projectDueDate.text = self.myProject.projectDueDate;

    DBSMessage *tmpMessage = [[DBSMessage alloc] init];
    tmpMessage = [self.myProject.projectMessagesList objectForKey:@"msg"];

    NSLog(@"%@", self.myProject.projectCode);
    NSLog(@"%@", [tmpMessage messageText]);
}

-(id)init {
    self = [super init];
    if (self) {
        [self setProjectCode:@"CODE"];
        //you are not assigning the object into ivar..you are creating a local object
        //NSMutableDictionary *projectMessagesList = [[NSMutableDictionary alloc] init];
        //into
        projectMessagesList = [[NSMutableDictionary alloc] init];
        DBSMessage *message = [[DBSMessage alloc] init];

        [message setMessageDate:[NSDate date]];
        [message setMessageText:[NSString stringWithFormat:@"This is a message"]];
        [projectMessagesList setObject:message forKey:@"msg"];
        NSLog(@"%@", [projectMessagesList objectForKey:@"msg"]);
        }
    }
    return self;
}