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为什么在这个循环中要销毁NSMutableArray?

nsmutablearray objective-c iphone

Mausimo · 技术社区 · 14 年前

是阵列的性能被破坏了。

这是数组的.h:

    NSMutableArray * arrayOfPerformances;
}
@property (nonatomic, retain) NSMutableArray * arrayOfPerformances;

还有有循环的.m:

[dataArray release];
[dataDictionary release];
dataArray = [[NSMutableArray alloc] init];
dataDictionary = [[NSMutableDictionary alloc] init];

NSDate * CurrentDate = start;
int i = 0;

NSMutableArray * arrayOfPerformancesForCurrentDate = [[NSMutableArray alloc] init];
while(YES)
{
    i = 0;
    if ([arrayOfPerformancesForCurrentDate count] > 0)
    {
        [arrayOfPerformancesForCurrentDate removeAllObjects];   
    }

    for (i; i < self.arrayOfPerformances.count; i++)
    {
        Performance * performanceItem = [[Performance alloc] init]; 
        performanceItem = [self.arrayOfPerformances objectAtIndex:i];

        NSString * sPerformanceDate = [performanceItem.sDate substringToIndex:10];
        NSString * sCurrentDate = [CurrentDate dateDescription];

        if([sPerformanceDate isEqualToString:sCurrentDate])
        {
            [arrayOfPerformancesForCurrentDate addObject:performanceItem];
        }

        [performanceItem release];
    }

    if ([arrayOfPerformancesForCurrentDate count] >= 1)
    {
        [dataDictionary setObject:arrayOfPerformancesForCurrentDate forKey:CurrentDate];
        [dataArray addObject:[NSNumber numberWithBool:YES]];
    }
    else
    {
        [dataArray addObject:[NSNumber numberWithBool:NO]];
    }

    TKDateInformation info = [CurrentDate dateInformation];
    info.day++;
    CurrentDate = [NSDate dateFromDateInformation:info];
    if([CurrentDate compare:end]==NSOrderedDescending) break;
}

任何帮助都将不胜感激。我不明白为什么会这样?

2 回复 | 直到 14 年前

user467105user467105 14 年前

这部分看起来不对:

Performance * performanceItem = [[Performance alloc] init];     <--
performanceItem = [self.arrayOfPerformances objectAtIndex:i];   <--

NSString * sPerformanceDate = [performanceItem.sDate substringToIndex:10];
NSString * sCurrentDate = [CurrentDate dateDescription];

if([sPerformanceDate isEqualToString:sCurrentDate])
{
    [arrayOfPerformancesForCurrentDate addObject:performanceItem];
}

[performanceItem release];                                      <--

您允许+in it performanceItem,但随后将其设置为arrayofpperformances中的对象,然后释放它(当它指向arrayofpperformances中的对象时)。

将该部分改为:

Performance *performanceItem = [self.arrayOfPerformances objectAtIndex:i];

NSString * sPerformanceDate = [performanceItem.sDate substringToIndex:10];
NSString * sCurrentDate = [CurrentDate dateDescription];

if([sPerformanceDate isEqualToString:sCurrentDate])
{
    [arrayOfPerformancesForCurrentDate addObject:performanceItem];
}

//don't release performanceItem

raidfive 14 年前

我不认为被摧毁的表现。看起来你甚至没有在任何地方初始化它。