Dictionary and Array value cannot be nil

Dictionary value cannot be nil

Terminating app due to uncaught exception ‘NSInvalidArgumentException‘, reason: ‘*** -[__NSPlaceholderDictionary initWithObjects:forKeys:count:]: attempt to insert nil object from objects[2]‘

*** First throw call stack:

NSString *a;

dic2 =
@{

@"key":@"value",

@"ko":@"",

@"xue":a

};

Array element cannot be nil

Terminating app due to uncaught exception ‘NSInvalidArgumentException‘, reason: ‘*** -[__NSPlaceholderArray initWithObjects:count:]: attempt to insert nil object from objects[2]‘

*** First throw call stack:

NSString *a;

array2 = @[@"",@"0",a];

测试：数组不能有nil的对象，字典不能插入nil的值

-(void)setData{

NSDictionary *dic1;

NSArray *array1;

dic1 = @{};

array1 = @[];

NSLog(@"dic1:%@",dic1);

NSLog(@"array1:%@",array1);

NSDictionary *dic2;

NSArray *array2;

NSString *a;

//    a=nil;

dic2 = @{

@"key":@"value",

@"ko":@"",

@"xue":a

};

array2 = @[@"",@"0",a];

NSLog(@"dic2:%@",dic2);

NSLog(@"array2:%@",array2);

}