Question

我正在尝试填充一个从awakeFromNib调用的数组。我的问题是，当我尝试访问变量时，该变量不可见。

以下是相关摘录：

   -(id)returnHaiku
{
    return [self getOne:[self getOne:five]] // doesn't know what "five" is...
}

- (void)awakeFromNib

{
    [super awakeFromNib];
    [self fillArrays];  
}

-(id)fillArrays
{   
    NSArray *five=[NSArray arrayWithObjects: @"blustry zen buddhists",@"barking tiny dogs", @"closeted bigot", @"yowling alley cats",@"shrugging teenagers",@"piece of tangled string", @"ball of woolen yarn", @"big pile of garbage",  @"line of well-wishers", @"moldy piece of bread", @"middle manager", @"a terrified rat", @"whispering goofballs", @"various people", @"cross-dressing monkey", @"terrifying dolt", @"sneering idiot", @"grinning sycophant", @"hurtful sloganist",@"annoying haiku",@"hardened criminal",@"vile politician", @"lost generation", @"poetical crap",@"slimy strategist", @"fake conservative", @"old-style liberal",@"evil yuppie scum", @"proud midwesterner",@"artful panhandler",@"noisy spoiled brats",@"frustrated poseurs",nil];
    return five;
}

-(id)getOne:(NSArray *)myArray
{
    return [[myArray objectAtIndex:arc4random()%myArray.count]stringByAppendingString:@"\n"];
}

我很感激你能为这个新手提供任何帮助。提前谢谢。

Answer 1

您的fillArrays方法正在创建新的本地 NSArray，然后将其返回。但是，您正在调用此方法：

[self fillArrays];

问题是你完全忽略了返回值，这意味着你的数组在堆栈帧之间存在的小空隙中迷失了。

Answer 2

five不是实例变量，因此它仅在fillArrays中可见。您应该将five设为实例变量。

Answer 3

行。

回答我自己的问题，但也许这会帮助其他人。

以下是相关代码，我最终得到的结果：

-(id)returnHaiku
{
    return [self getOne:five];
}

- (void)awakeFromNib

{
    [super awakeFromNib];

    [self fillArrays];  
}

-(void)fillArrays
{
//fill array declared in header file as an instance variable

//Note: it's using arrayWithObjects, a factory method, which I guess 
// autoreleases memory after the array is no longer needed...

five=[NSArray arrayWithObjects: @"blustry zen buddhists",@"barking tiny dogs", @"closeted bigot", @"yowling alley cats",@"shrugging teenagers",@"piece of tangled string", nil];

// and here's what I was missing!!
     [five retain];
}

-(id)getOne:(NSArray *)myArray
// returns random element from an array
{
    return [[myArray objectAtIndex:arc4random()%myArray.count]stringByAppendingString:@"\n"];
}

所以我之前的问题显然涉及没有保留我正在填充的数组。我猜它是在被传递出方法之后立即被转储，所以不能在后面的方法中使用从阵列中挑出一个随机对象。

这很好用。

OBJ C在awakefromnib填充数组 - 范围问题？

3 个答案: