Question

我正在使用NSData存储一个对象供以后使用。它有很多NSStrings，我需要将它从一个物体中拉出来出于某种原因，只存储了NSStrings的 some ，其他一些被归零！我认为它必须是我的代码，我必须忘记初始化一些字符串，但由于一个非常奇怪的原因，一些字符串会丢失数据！我无法得到theImportantString得到它的相关值，因为它首先看起来变量得到了它的值，但是从Unarchive返回后，它等于@“”！

// CMyData.h
/////////////////////

@interface CMyData : NSObject <NSCoding>
{
    NSString *ID;
    NSString *DIST;
    .  
    .  
}
@property (nonatomic,retain) NSString *ID;
@property (nonatomic,retain) NSString *DIST;

@end

// CMyData.m
//////////////////////

#import "CMyData.h"
@implementation CMyData

@synthesize ID;
@synthesize DIST;

- (id)initWithCoder:(NSCoder *)decoder {
    if (self = [super init]) {
        self.ID = [decoder decodeObjectForKey:@"ID"];
        self.DIST = [decoder decodeObjectForKey:@"DIST"];
    .  
    .  
 }


- (void)encodeWithCoder:(NSCoder *)encoder {
    [encoder encodeObject:ID forKey:@"ID"];
    [encoder encodeObject:DIST forKey:@"DIST"];
    .  
    .  

}

- (void)dealloc {
    [ID release];
    [DIST release];
    [super dealloc];

}

@end

MyController.m

-(void) makeObject: (NSDictionary *)dict
{    
    CMyData* myData=[[CMyData alloc] init];
    myData.ID = [[NSString alloc] initWithString:[dict objectForKey:@"NAME"]];
    myData.DIST = [[NSString alloc] initWithString:[dict objectForKey:@"DISTRIBUTOR"]];
    .  
    .  

    myObject = [[[MYObject alloc] init];

    myObject.data = [NSKeyedArchiver archivedDataWithRootObject:myData];
}

然后按下按钮就会发生：

- (void) tapOnIcon: (MyObject*)theObject 
{
    CMyData *data = [NSKeyedUnarchiver unarchiveObjectWithData:theObject.data];
    [delegate showData:data];
}

委托控制器中的

（无法再设置值）：

delegateController.m
/////////////////////////////////

-(void) showData:(CMyData*)theData{
     self.theImportantString = [[NSString alloc] initWithString:theData.DIST];
     .
     .
     .


}

Answer 1

似乎你的类型不匹配：

// in - (id)initWithCoder:(NSCoder *)decoder
self.DIST = [decoder decodeIntForKey:@"DIST"];

但在宣言中你有

// in CMyData.h
NSString *DIST;

这应该是：

// in - (id)initWithCoder:(NSCoder *)decoder
self.DIST = [NSString stringWithFormat:@"%d", [decoder decodeIntForKey:@"DIST"]];

某些NSCoding变量未被检索

1 个答案: