Iphone 为什么'；我的NSMUTABLEARRY不能写入plist吗？

我有以下代码块：

NSMutableArray* mergedSymbolsArray = [NSMutableArray array];
                    for (NSDictionary* aSymbol in localSet) {

                        NSLog(@"Symbol:%@",[aSymbol valueForKey:@"symbol"]);
                        [mergedSymbolsArray addObject:aSymbol];

                    }

                    [Utils writeObjectToPList:mergedSymbolsArray]; 
                    tickers = [Utils getDataFromPList]; 

以下是我要读/写plist的代码：

+ (void)writeObjectToPList:(id)myData {  
    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *documentsDirectory = [paths objectAtIndex:0];
    NSString *path = [documentsDirectory stringByAppendingPathComponent:@"mobile-watchlist.plist"];
    [myData writeToFile:path atomically:YES];
}  

+(NSMutableArray*)getDataFromPList
{
    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *documentsDirectory = [paths objectAtIndex:0];
    NSString *path = [documentsDirectory stringByAppendingPathComponent:@"mobile-watchlist.plist"];

    NSMutableArray* myArray = [[NSMutableArray alloc] initWithContentsOfFile:path];
    NSLog(@"READING -- PList Data Count: %d", [myArray count]);
    return [[NSMutableArray alloc] initWithContentsOfFile:path];
}

[tickers addObject:[NSDictionary dictionaryWithObjectsAndKeys:@"GOOG", @"symbol", @"2044", @"id", nil]];
        [tickers addObject:[NSDictionary dictionaryWithObjectsAndKeys:@"AAPL", @"symbol", @"686", @"id", nil]];
        [tickers addObject:[NSDictionary dictionaryWithObjectsAndKeys:@"YHOO", @"symbol", @"4177", @"id", nil]];

        [Utils writeObjectToPList:tickers];

由于某种原因，

mergedSymbolsArray

不会写入plist。我不知道为什么？

我能够将以下内容写入plist：

+ (void)writeObjectToPList:(id)myData {  
    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *documentsDirectory = [paths objectAtIndex:0];
    NSString *path = [documentsDirectory stringByAppendingPathComponent:@"mobile-watchlist.plist"];
    [myData writeToFile:path atomically:YES];
}  

+(NSMutableArray*)getDataFromPList
{
    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *documentsDirectory = [paths objectAtIndex:0];
    NSString *path = [documentsDirectory stringByAppendingPathComponent:@"mobile-watchlist.plist"];

    NSMutableArray* myArray = [[NSMutableArray alloc] initWithContentsOfFile:path];
    NSLog(@"READING -- PList Data Count: %d", [myArray count]);
    return [[NSMutableArray alloc] initWithContentsOfFile:path];
}

[tickers addObject:[NSDictionary dictionaryWithObjectsAndKeys:@"GOOG", @"symbol", @"2044", @"id", nil]];
        [tickers addObject:[NSDictionary dictionaryWithObjectsAndKeys:@"AAPL", @"symbol", @"686", @"id", nil]];
        [tickers addObject:[NSDictionary dictionaryWithObjectsAndKeys:@"YHOO", @"symbol", @"4177", @"id", nil]];

        [Utils writeObjectToPList:tickers];

为什么第一块代码不写入plist？

补充说明： 以下是mergedSymbolsArray包含的字典示例：

  {
    "charts_count" = 2;
    "created_at" = "2010-04-12T16:37:32Z";
    exchange = NASDAQ;
    "followers_count" = 259;
    id = 8404;
    industry = "<null>";
    "messages_count" = 1436;
    ric = "GRPN.O";
    sector = "<null>";
    symbol = GRPN;
    title = Groupon;
    "updated_at" = "2011-09-05T04:17:56Z";
}

{
“图表计数”=2；
“创建于”=“2010-04-12T16:37:32Z”；
交易所=纳斯达克；
“追随者数量”=259；
id=8404；
行业=”；
“邮件数量”=1436；
ric=“GRPN.O”；
部门=”；
符号=GRPN；
标题=Groupon；
“更新时间”=“2011-09-05T04:17:56Z”；
}

---

我猜writeToFile:atomically方法失败，因为无法写入？

检查

[myData writeToFile:path atomically:YES]的返回值请。如果为否，则在写入时发生了一些错误。请尝试alloc init NSMutableArray，而不是创建一个自动删除的数组。
检查
[myData WriteFile:path Atomicaly:YES]的返回值请。如果不是，则在写入时发生了一些错误。请尝试alloc init NSMutableArray，而不是创建自动删除的NSMutableArray。
尝试在文件名中添加正斜杠，即：

NSString *path = [documentsDirectory stringByAppendingString:@"/mobile-watchlist.plist"];

尝试在文件名中添加正斜杠，即：

NSString *path = [documentsDirectory stringByAppendingString:@"/mobile-watchlist.plist"];

确保数组中保留的所有对象都是属性列表对象（NSString、NSData、NSArray或NSDictionary）。
确保数组中保留的所有对象都是属性列表对象（NSString、NSData、NSArray或NSDictionary）。
由于dta包含扇区=“”其值被解释为NSNull，无法写入plist

在序列化之前，我将NSArray或NSDictionary转换为NSData。以下是nsarray上用于序列化和反序列化的类别。此ComfortabyBy可处理某些nsnull数据

-(BOOL)writeToPlistFile:(NSString*)filename{
    NSData * data = [NSKeyedArchiver archivedDataWithRootObject:self];
    NSArray * paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString * documentsDirectory = [paths objectAtIndex:0];
    NSString * path = [documentsDirectory stringByAppendingPathComponent:filename];
    BOOL didWriteSuccessfull = [data writeToFile:path atomically:YES];
    return didWriteSuccessfull;
}

+(NSArray*)readFromPlistFile:(NSString*)filename{
    NSArray * paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString * documentsDirectory = [paths objectAtIndex:0];
    NSString * path = [documentsDirectory stringByAppendingPathComponent:filename];
    NSData * data = [NSData dataWithContentsOfFile:path];
    return  [NSKeyedUnarchiver unarchiveObjectWithData:data];
}

它失败是因为dta包含扇区=“其值被解释为NSNull，并且无法写入plist

在序列化之前，我将NSArray或NSDictionary转换为NSData。以下是nsarray上用于序列化和反序列化的类别。此ComfortabyBy可处理某些nsnull数据

-(BOOL)writeToPlistFile:(NSString*)filename{
    NSData * data = [NSKeyedArchiver archivedDataWithRootObject:self];
    NSArray * paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString * documentsDirectory = [paths objectAtIndex:0];
    NSString * path = [documentsDirectory stringByAppendingPathComponent:filename];
    BOOL didWriteSuccessfull = [data writeToFile:path atomically:YES];
    return didWriteSuccessfull;
}

+(NSArray*)readFromPlistFile:(NSString*)filename{
    NSArray * paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString * documentsDirectory = [paths objectAtIndex:0];
    NSString * path = [documentsDirectory stringByAppendingPathComponent:filename];
    NSData * data = [NSData dataWithContentsOfFile:path];
    return  [NSKeyedUnarchiver unarchiveObjectWithData:data];
}

我检查了writeToFile:是否以原子方式正确返回。不幸的是，对于我的情况，它没有返回。如何进一步诊断？@Sheehan调用writeToFile:时path的值是多少？目录是否存在？目录是否存在。path的值是
/Users/syalam/Library/Application Support/iPhone Simulator/4.3.2/Applications/2C2B2FDF-B376-43FA-AA95-49921B3DC3B4/Documents/mobile watchlist.plist
I检查writeToFile:atomically返回是否正确。不幸的是，对于我的情况，它没有返回。如何进一步诊断？@Sheehan调用writeToFile:时path的值是多少？目录是否存在？目录是否存在。path的值是
/Users/syalam/Library/Application Support/iPhone Simulator/4.3.2/Applications/2C2B2FDF-B376-43FA-AA95-49921B3DC3B4/Documents/mobile watchlist.plist
stringByAppendingPathComponent
它会自动运行吗幸运的是，这并不能解决我的问题。仍然无法通过追加PathComponent来编写plist
stringByAppendingPathComponent
是否自动执行。幸运的是，这并不能解决我的问题。仍然无法写入plist+（void）writeObjectToPList:（id）myData。尝试将（id）更改为NSMutableArray。。。。type@booleanboy我将其更改为NSMutableArray，令人遗憾的是，在将数据添加到MergedSymbolArray后，使用NSLog检查数据是否确实存储了…并尝试使用alloc而不是autorelease array…writeToFile实际返回否。我更改为alloc而不是autorelease，同样的结果。为什么writeToFile返回NO？请尝试将原子设置为NO+（void）WriteObject TopList:（id）myData。尝试将（id）更改为NSMutableArray。。。。type@booleanboy我将其更改为NSMutableArray，令人遗憾的是，在将数据添加到MergedSymbolArray后，使用NSLog检查数据是否确实存储了…并尝试使用alloc而不是autorelease array…writeToFile实际返回否。我更改为alloc而不是autorelease，同样的结果。为什么writeToFile返回NO？尝试将Atomicaly设置为NotAnks来执行此操作。它确实解决了我的问题：）我错过了NSKeyedArchiver，我想我很快会读到更多关于它的内容isA:）再次感谢您的帮助：）非常感谢它确实解决了我的问题：）我错过了NSKeyedArchiver，我想我很快就会读到更多关于它的信息（伊莎：）再次感谢你的帮助：）