無法從對象創建的NSArray

-1

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[Switching to process 2530 thread 0x0] 
2011-11-12 18:29:29.857 RaiseMan[2530:707] Cannot create NSArray from object <Document: 0x100539a00> of class Document 
2011-11-12 18:29:29.879 RaiseMan[2530:707] Cannot create NSArray from object <Document: 0x10015dda0> of class Document 
2011-11-12 18:30:10.362 RaiseMan[2530:707] Cannot create NSArray from object <Document: 0x1001b0a90> of class Document

person.h：

#import <Foundation/Foundation.h> 

@interface Person : NSObject 
{ 
    NSString *personName; 
    float expectedRaise; 
} 

@property (readwrite, copy) NSString *personName; 
@property (readwrite) float expectedRaise; 

@end

person.m：

#import "Person.h" 

@implementation Person 

- (id) init 
{ 
    self = [super init]; 
    expectedRaise = 5.0; 
    personName = @"New Person"; 
    return self;  
} 

- (void)dealloc 
{ 
    [personName release]; 
    [super dealloc]; 
} 

@synthesize personName; 
@synthesize expectedRaise; 

@end

document.h：

#import <Cocoa/Cocoa.h> 

@interface Document : NSDocument 
{ 
    NSMutableArray *employees; 
} 

- (void)setEmployees:(NSMutableArray *)a; 

@end

document.m

#import "Document.h" 

@implementation Document 

- (id)init 
{ 
    self = [super init]; 
    //if (self) { 
     employees = [[NSMutableArray alloc] init]; 
    //} 
    return self; 
} 

- (void)dealloc 
{ 
    [self setEmployees:nil]; 
    [super dealloc]; 
} 


-(void)setEmployees:(NSMutableArray *)a 
{ 
    //this is an unusual setter method we are goign to ad a lot of smarts in the next chapter 
    if (a == employees) 
     return; 
    [a retain]; 
    [employees release]; 
    employees = a; 
} 

- (NSString *)windowNibName 
{ 
    // Override returning the nib file name of the document 
    // If you need to use a subclass of NSWindowController or if your document supports multiple NSWindowControllers, you should remove this method and override -makeWindowControllers instead. 
    return @"Document"; 
} 

- (void)windowControllerDidLoadNib:(NSWindowController *)aController 
{ 
    [super windowControllerDidLoadNib:aController]; 
    // Add any code here that needs to be executed once the windowController has loaded the document's window. 
} 

- (NSData *)dataOfType:(NSString *)typeName error:(NSError **)outError 
{ 
    /* 
    Insert code here to write your document to data of the specified type. If outError != NULL, ensure that you create and set an appropriate error when returning nil. 
    You can also choose to override -fileWrapperOfType:error:, -writeToURL:ofType:error:, or -writeToURL:ofType:forSaveOperation:originalContentsURL:error: instead. 
    */ 
    NSException *exception = [NSException exceptionWithName:@"UnimplementedMethod" reason:[NSString stringWithFormat:@"%@ is unimplemented", NSStringFromSelector(_cmd)] userInfo:nil]; 
    @throw exception; 
    return nil; 
} 

- (BOOL)readFromData:(NSData *)data ofType:(NSString *)typeName error:(NSError **)outError 
{ 
    /* 
    Insert code here to read your document from the given data of the specified type. If outError != NULL, ensure that you create and set an appropriate error when returning NO. 
    You can also choose to override -readFromFileWrapper:ofType:error: or -readFromURL:ofType:error: instead. 
    If you override either of these, you should also override -isEntireFileLoaded to return NO if the contents are lazily loaded. 
    */ 
    NSException *exception = [NSException exceptionWithName:@"UnimplementedMethod" reason:[NSString stringWithFormat:@"%@ is unimplemented", NSStringFromSelector(_cmd)] userInfo:nil]; 
    @throw exception; 
    return YES; 
} 

+ (BOOL)autosavesInPlace 
{ 
    return YES; 
} 

@end

完整的項目代碼：http://sharesend.com/zyca7

來源

2011-11-13 ian

爲什麼你沒有在錯誤消息中包含模塊（或相關行），並期望人們下載zip文件？ –

不確定你的意思？我在上面列出了完整的錯誤，並在文章中列出了完整的代碼？我包括了整個項目，因爲有很多綁定等，因爲這是一個嘖嘖，我正在學習可可，我不知道我可能做錯了什麼。 – ian