调试问题 - 值被隐藏

Question

我需要了解是什么导致了我的问题。我有一个源代码，我想对其进行一些调试，但我看不到变量。

例如：

NSArray *oldSavedArray = [NSKeyedUnarchiver unarchiveObjectWithData:dataRepresentingSavedArray];
NSLog(@"The content of oldSavedArray is%@",oldSavedArray);

我明白了：

2015-05-04 11:06:28.275 MobilePocket[59803:12619613] The content of oldSavedArray is(
    "<MPCheckedCurrency: 0x7f9903b21090>",
    "<MPCheckedCurrency: 0x7f9903b20fc0>",
    "<MPCheckedCurrency: 0x7f9903b21130>",
    "<MPCheckedCurrency: 0x7f9903b21170>",
    "<MPCheckedCurrency: 0x7f9903b21510>",
    "<MPCheckedCurrency: 0x7f9903b21190>"
)

或为此：

 NSUserDefaults *currentDefaults = [NSUserDefaults standardUserDefaults];
    NSData *dataRepresentingSavedArray = [currentDefaults objectForKey:currencyCheckedArrayKey];

我得到这样的东西:

(lldb) po dataRepresentingSavedArray
<62706c69 73743030 d4010203 0405064d 4e582476 65727369 6f6e5824 6f626a65 63747359 24617263 68697665 72542474 ...etc

可能是这个问题:

@implementation MPCheckedCurrency

@synthesize currencyCode;
@synthesize currencyValue;

- (void)encodeWithCoder:(NSCoder *)coder;
{
    [coder encodeObject:currencyCode forKey:currencyCheckedCodeKey];
    [coder encodeObject:currencyValue forKey:currencyCheckedValueKey];
}

- (id)initWithCoder:(NSCoder *)coder;
{
    self = [super init];
    if (self != nil)
    {
        self.currencyCode = [coder decodeObjectForKey:currencyCheckedCodeKey];
        self.currencyValue = [coder decodeObjectForKey:currencyCheckedValueKey];
    }
    return self;
}

如何查看数组的内容？任何帮助将不胜感激！

Answer 1

您正在为每个对象使用 [NSObject description] 方法，returns 在此上下文中使用时，感觉可能有用的字符串。有时根本没用。

要解决此问题，请在 MPCheckedCurrency 对象中实施 description：

- (NSString *)description
{
    return [NSString stringWithFormat:@"[currenyCode=%@, currencyValue=%@]", currencyCode, currencyValue];
}

（您可能还需要在 currencyCode 和 currentValue 对象中实现 description。

Answer 2

当你使用 NSLog 时，它会调用 description 方法。

所以不是确切的代码，但您需要执行如下操作；

@implementation MPCheckedCurrency

@synthesize currencyCode;
@synthesize currencyValue;

- (void)encodeWithCoder:(NSCoder *)coder;
{
    [coder encodeObject:currencyCode forKey:currencyCheckedCodeKey];
    [coder encodeObject:currencyValue forKey:currencyCheckedValueKey];
}

- (id)initWithCoder:(NSCoder *)coder;
{
    self = [super init];
    if (self != nil)
    {
        self.currencyCode = [coder decodeObjectForKey:currencyCheckedCodeKey];
        self.currencyValue = [coder decodeObjectForKey:currencyCheckedValueKey];
    }
    return self;
}

-(NSString*)description{
     return [NSString stringWithFormat:@"code: %d, value : %f",currencyCode,currencyValue];
}

Answer 3

@Adina - 你的问题是你在 NSLog 上打印完整的对象（数组）。相反，您需要在数组中循环并打印实际的对象值，如下所示：

for(objmpcheckcurrency in oldsavedarray)
{
       NSLog(@"The content of oldSavedArray is %@ %@",objmpcheckcurrency.currencyCode, objmpcheckcurrency.currencyValue);
}

调试问题 - 值被隐藏

Debuging problems - Values are hidden

ios

objective-c

debugging

nscoder

nsarchiving