ios - NSKeyedUnarchiver 无法理解的存档

Question

我遇到了一个奇怪的崩溃，大麦曾经发生过，我想知道这是否是由于读取了损坏的数据造成的？我发生了这个错误:

-[NSKeyedUnarchiver initForReadingWithData:]: incomprehensible archive


> # Binary Image Name   Address Symbol 0    CoreFoundation  0x3357b2a3  __exceptionPreprocess
> 1 libobjc.A.dylib 0x3b3df97f  objc_exception_throw
> 2 CoreFoundation  0x3357b1c5  -[NSException initWithCoder:]
> 3 Foundation  0x33e124ef  -[NSKeyedUnarchiver initForReadingWithData:]
> 4 Foundation  0x33e73537  +[NSKeyedUnarchiver unarchiveObjectWithFile:]

我的代码很好，这在我的应用程序中发生过一次，但我只是想知道损坏的数据是否是导致这种情况发生的可行原因。如果是这样，有没有办法处理损坏的数据？

Answer 1

您可以将部分代码包裹在@try @catch 构造中以评估异常并避免崩溃。这是示例:

- (UIImage*) loadImageFromCacheWithFilePath: (NSString*) somePath {

    UIImage* image = nil;

    @try {
        image = [NSKeyedUnarchiver unarchiveObjectWithFile:somePath];
    } @catch (NSException* exception) {
        // Surpress any unarchiving exceptions and continue with nil
        NSLog(@"Load image from cache was failed with exception: %@", [exception reason]);
    }

    return image; //This will return nil if exception caught
}