获取异常为"收集在枚举时发生变异"

Question

当我使用这个代码时,我得到的集合是在被枚举异常时发生变异的,任何人都可以建议我如何摆脱这个.

PaymentTerms * currentElement;
for (currentElement in termsArray)
{
    printf("\n currentElement Value........%s",[currentElement.days UTF8String]);
    printf("\n Str value...%s",[Str UTF8String]);
    NSRange range = [currentElement.days rangeOfString:Str options:NSCaseInsensitiveSearch];
    if(!(range.location != NSNotFound))
    {
        PaymentTerms *pTerm1 = [[PaymentTerms alloc]init];
        pTerm1.days = Str;
        printf("\n  pTerm1.days...%s",[ pTerm1.days UTF8String]);
        [termsArray addObject:pTerm1];
    }   
}

希望我能得到你们的快速反应.提前谢谢,Monish.

Answer 1

在枚举时无法更改数组.作为一种解决方法,您应该在临时数组中累积新对象,并在枚举后添加它们:

PaymentTerms * currentElement;
NSMutableArray* tempArray = [NSMutableArray array];
for (currentElement in termsArray)
{
    NSRange range = [currentElement.days rangeOfString:Str options:NSCaseInsensitiveSearch];
    if(!(range.location != NSNotFound))
    {
       PaymentTerms *pTerm1 = [[PaymentTerms alloc]init];
       pTerm1.days = Str;
       [tempArray addObject:pTerm1];
       [pTerm1 release];
    }   
}
[termsArray addObjectsFromArray: tempArray];

PS不要忘记发布你创建的pTerm1对象 - 你的代码包含内存泄漏

在回应海报的评论(和实际任务)时 - 我认为最简单的方法是制作bool标志,指示是否在周期中找到了日值.如果不是 - 在循环结束后添加新对象:

PaymentTerms * currentElement;
BOOL dayFound = NO;
for (currentElement in termsArray)
{
    NSRange range = [currentElement.days rangeOfString:Str options:NSCaseInsensitiveSearch];
    if(range.location != NSNotFound)
        dayFound = YES;
}
if (!dayFound)
     // Create and add new object here