iphone - NSData 和 NSArray -[__NSArrayM 长度]

Question

我不知道这里发生了什么，但这段代码抛出异常。基本上我将 NSData 存储到一个数组中，然后检索它以在 UIImageView 中使用。这是代码。

    imagesDataArray = [[NSMutableArray alloc] init];
    NSArray *imgDataArr = [[NSArray alloc] initWithArray:imageDataArray];
    for(int i = 0; i < [imgDataArr count]; i++)
    {
        NSLog(@"%@",[imgDataArr objectAtIndex:i]);
        UIImage *thumbImage = [[UIImage alloc] initWithData: [imgDataArr objectAtIndex:i]]; //this throws the exception
        [imagesDataArray addObject:thumbImage];
        [thumbImage release];
    }
    [imgDataArr release];

如您所见，我在 NSLog 中使用的相同代码 [imgDataArr objectAtIndex:i] 工作正常，但当我将它与 initWithData 配对时，它变得异常。这是错误日志。

    2011-10-17 15:56:47.008 myapp[39498:b303] -[__NSArrayM length]: unrecognized   
    selector sent to instance 0x4c98420
    2011-10-17 15:56:47.009 myapp[39498:b303] *** Terminating app due to uncaug

Answer 1

检查你的数组名.imagesDataArray

imagesDataArray = [[NSMutableArray alloc] initWithObjects:@"image1.png",@"image2.png",@"image3.jpg",@"image4.png",@"image6.png",@"image7.png",nil];
NSArray *imgDataArr = [[NSArray alloc] initWithArray:imagesDataArray];
for(int i = 0; i < [imgDataArr count]; i++)
{
    NSLog(@"%@",[imgDataArr objectAtIndex:i]);
    UIImage *thumbImage = [[UIImage alloc] initWithData: [imgDataArr objectAtIndex:i]]; //this throws the exception
    [imagesDataArray addObject:thumbImage];
    [thumbImage release];
}
[imgDataArr release];