NSKeyedArchiver不将数据写入文件...？

Question

@interface

@interface Patient : NSObject <NSCoding> 

@implementation

- (id)initWithCoder:(NSCoder *)decoder{ 

    self.patientPhoto = [decoder decodeObjectForKey:kPatientPhoto]; 
    self.firstName = [decoder decodeObjectForKey:kFirstName]; 
    self.lastName = [decoder decodeObjectForKey:kLastName]; 
    self.age = [decoder decodeIntForKey:kAge]; 
    self.photoPaths = [decoder decodeObjectForKey:kPhotoPaths]; 
    self.photoDates = [decoder decodeObjectForKey:kPhotoDates]; 

    return self; 

    } 

- (void)encodeWithCoder:(NSCoder *)encoder{ 

     [encoder encodeObject:self.patientPhoto forKey:kPatientPhoto]; 
     [encoder encodeObject:self.firstName forKey:kFirstName]; 
     [encoder encodeObject:self.lastName forKey:kLastName]; 
     [encoder encodeInt:self.age forKey:kAge]; 
     [encoder encodeObject:self.photoPaths forKey:kPhotoPaths]; 
     [encoder encodeObject:self.photoDates forKey:kPhotoDates]; 

    } 

在不同的实现我尝试归档该患者对象。

 IMDataController* dataCtr = [IMDataController sharedDataController]; 

    Patient *currentPatient = [[Patient alloc]init]; 

    currentPatient.patientPhoto = self.photo.image; 
    currentPatient.firstName = self.firstName.text; 
    currentPatient.lastName = self.lastName.text; 
    currentPatient.age = [self.lastName.text intValue]; 
    currentPatient.photoDates = nil; 
    currentPatient.photoPaths = nil; 

    NSString *patientNameForWriting = [self.firstName.text stringByAppendingString:self.lastName.text]; 

    NSString *stringToPatientObjectFile = [dataCtr createPatient:patientNameForWriting]; 

    NSFileManager* filemanager = [NSFileManager defaultManager]; 

    NSData *patientObjectArchived = [NSKeyedArchiver archivedDataWithRootObject:currentPatient]; 


    if([patientObjectArchived writeToFile:stringToPatientObjectFile atomically:YES]){ 


    }else{ 

     NSLog(@"Patient Object Didn't Archive"); 

    } 

if语句中的上述方法没有返回YES。我检查了零的数据，我检查了我的编码器方法，我找不到问题。我正在将数据写入NSString文件路径：.../Documents/PatientName/PatientObject.archive。我也符合患者分类中的协议。

Answer 1

确保父目录存在。据我记得，writeToFile:atomically:不会自动创建目录层次结构。

Answer 2

用以下替换您NSCoding实现：

- (id)initWithCoder:(NSCoder *)decoder{ 
    if (self = [super initWithCoder:(NSCoder *) decoder]) 
    { 
     self.patientPhoto = [decoder decodeObjectForKey:kPatientPhoto]; 
     self.firstName = [decoder decodeObjectForKey:kFirstName]; 
     self.lastName = [decoder decodeObjectForKey:kLastName]; 
     self.age = [decoder decodeIntForKey:kAge]; 
     self.photoPaths = [decoder decodeObjectForKey:kPhotoPaths]; 
     self.photoDates = [decoder decodeObjectForKey:kPhotoDates]; 
    } 
    return self; 

    } 

- (void)encodeWithCoder:(NSCoder *)encoder{ 
     [super encodeWithCoder:encoder]; 
     [encoder encodeObject:self.patientPhoto forKey:kPatientPhoto]; 
     [encoder encodeObject:self.firstName forKey:kFirstName]; 
     [encoder encodeObject:self.lastName forKey:kLastName]; 
     [encoder encodeInt:self.age forKey:kAge]; 
     [encoder encodeObject:self.photoPaths forKey:kPhotoPaths]; 
     [encoder encodeObject:self.photoDates forKey:kPhotoDates]; 

} 

，然后更改行：

NSData *patientObjectArchived = [NSKeyedArchiver archivedDataWithRootObject:currentPatient]; 

有：

NSMutableData *patientObjectArchived = [NSMutableData data]; 
NSKeyedArchiver *archiver = [[NSKeyedArchiver alloc] initForWritingWithMutableData: patientObjectArchived]; 
[archiver encodeObject:currentPatient forKey:@"someKey"]; 
[archiver finishEncoding];