将字典里的的Null转为空

这个方法把<null>转为空字符串

-(void)setValuesForKeysWithDictionary:(NSDictionary<NSString *,id> *)keyedValues

{

    NSMutableDictionary *dic = [[NSMutableDictionary
alloc]
initWithDictionary:keyedValues];

    NSArray *valueArray= [dic
allKeys];

    for (NSString *key
in valueArray) {

        if ([[dic
objectForKey:key]isEqual:[NSNull
null]]) {

                [dic setObject:@""
forKey:key];

        }

    }

    [super
setValuesForKeysWithDictionary:dic];

}