Question

我正在与开放的简历和迅速。将NSDictionary从Objective-C文件返回到Swift时出错。

2018-10-10 12:43:25.972927+0530 OPencvwithSwift[2430:618249] -[__NSFrozenDictionaryM length]: unrecognized selector sent to instance 0x1c022b6e0
2018-10-10 12:43:25.973704+0530 OPencvwithSwift[2430:618249] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[__NSFrozenDictionaryM length]: unrecognized selector sent to instance 0x1c022b6e0'
*** First throw call stack:
(0x183eb6d8c 0x1830705ec 0x183ec4098 0x183ebc5c8 0x183da241c 0x1053c23d4 0x105360aa0 0x10585294c 0x104aec9a0 0x104ae287c 0x105cd51dc 0x105cd519c 0x105cd9d2c 0x183e5f070 0x183e5cbc8 0x183d7cda8 0x185d62020 0x18dd9c758 0x104af984c 0x18380dfc0)
libc++abi.dylib: terminating with uncaught exception of type NSException

这是目标c代码-

- (NSDictionary *)predict:(UIImage*)img confidence:(double)confidence {

    cv::Mat src = [img cvMatRepresentationGray];
    int label;
    NSLog(@"%d",label);
    std::cout<<_labelsDictionary;
    self->_faceClassifier->predict(src, label, confidence);
    NSLog(@"%f",confidence);
    NSMutableDictionary *dict = [[NSMutableDictionary alloc]initWithCapacity:10];
    [dict setObject:[NSNumber numberWithInt:confidence] forKey:_labelsDictionary[@(label)]];
    NSLog(@"%@",dict);
    return dict;
}

从Swift调用此函数：

let result = facemodel?.predict(greyimage, confidence: confidence) // crash on this line

Answer 1

您的应用程序可能在执行Objective-C方法时崩溃。在Objective-C方法内使用断点，然后逐步进行操作，以便发现崩溃。

没有办法崩溃将pretict方法的返回字典分配给结果变量。它提供[AnyHashable：Any]结果，因此您将有一个[AnyHashable：Any]类型结果对象。

Answer 2

如果我对您的理解是正确的，那么在使用字典之前，在其他地方，它已指向字符串。如此崩溃

将Dictonary从Objective c文件返回到Swift？

2 个答案: