0

我的应用程序在模拟器中运行良好,但在设备上运行时,它以 SIGABRT 终止。我已将其缩小到以下代码:

- (void)loadImage {
int imageNumber = currentImageNumber;
// check to see if the image has already been downloaded.
// if not, get it and add it to an array
if ([imageData count] < totalNumberOfImages && (imageNumber + 1) > [imageData count]) {
    NSString *urlString = [[mainMenuItem.imageDetails objectAtIndex: imageNumber] objectForKey: @"url"];
    NSURL *url = [NSURL URLWithString: urlString];
    NSData *data = [NSData dataWithContentsOfURL: url];
    UIImage *image = [UIImage imageWithData: data];
    [imageData addObject: image];
}

// set the image from the array
self.imageOnScreen = [imageData objectAtIndex: imageNumber];

}

它是 [imageData addObject:image]; 生成崩溃的消息,带有以下控制台输出:

2010-09-17 00:03:03.005 PilotsMate[17426:5e03] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '*** -[NSMutableArray insertObject:atIndex:]: attempt to insert nil object at 0'
*** Call stack at first throw:
(
    0   CoreFoundation                      0x313f4fd3 __exceptionPreprocess + 114
    1   libobjc.A.dylib                     0x3302f8a5 objc_exception_throw + 24
    2   CoreFoundation                      0x31377f99 -[__NSArrayM insertObject:atIndex:] + 472
    3   CoreFoundation                      0x31377da7 -[__NSArrayM addObject:] + 34
    4   PilotsMate                          0x00007c5d -[WeatherDetailViewController loadImage] + 300
    5   PilotsMate                          0x00007eb1 -[WeatherDetailViewController displayPicture:] + 232
    6   Foundation                          0x33265c9d -[NSThread main] + 44
    7   Foundation                          0x332ea9e1 __NSThread__main__ + 972
    8   libSystem.B.dylib                   0x3527598d _pthread_start + 248
    9   libSystem.B.dylib                   0x3526b0ec thread_assign_default + 4294967295
)
terminate called after throwing an instance of 'NSException'
[Switching to thread 11523]
[Switching to thread 11523]
Program received signal:  “SIGABRT”.
kill

是什么导致了这种情况,因为模拟器中没有问题?我很困惑,很感谢您的意见。我所做的就是在 viewDidLoad 中初始化一个 NSMutableArray,然后将一个对象添加到数组中。如果我清理目标,发生的情况不会改变。奇怪,因为这部分应用程序几天前运行良好,我根本没有修改这个实现文件(我也没有更新到最新的 iOS 4.1,所以操作系统或 Xcode 版本也没有变化) .

4

2 回答 2

3

您粘贴的错误消息说明了一切:

[NSMutableArray insertObject:atIndex:]: attempt to insert nil object at 0

image对象nil是。为什么呢nil?在 Xcode 中设置断点,同时在模拟器中运行它,并找出罪魁祸首中的哪一行。

于 2010-09-16T23:21:40.707 回答
0

为了详细说明 Shaggy Frog 的回答,我认为 image 为 nil 的最可能原因是从 URL 读取时出现问题。尝试使用dataWithContentsOfURL:options:error:并检查输出的错误以查看发生了什么。

于 2010-09-16T23:23:58.563 回答