我们在获取网络数据的时候，经常会遇到NSNull的问题，那我们如何去掉这个NsNull呢，
- (NSMutableDictionary *)dictionaryWithOutNull
{
NSArray *keysArr = [self allKeys];
for (NSString *keyStr in keysArr)
{
id value = [self objectForKey:keyStr];
if ([value isKindOfClass:[NSNull class]])
{
[self setValue:@"" forKey:keyStr];
}
else if ([value isKindOfClass:[NSArray class]])
{
NSMutableArray *valueArr = [NSMutableArray arrayWithArray:value];
for (id arrElements in value)
{
if ([arrElements isKindOfClass:[NSDictionary class]])
{
NSMutableDictionary *mutaDic = [NSMutableDictionary dictionaryWithDictionary:arrElements];
NSInteger index = [valueArr indexOfObject:arrElements];
NSDictionary *subDic = (NSDictionary *)[mutaDic dictionaryWithOutNull];
[valueArr replaceObjectAtIndex:index withObject:subDic];
}
}
[self setValue:valueArr forKey:keyStr];
//return dic;
}
else if ([value isKindOfClass:[NSDictionary class]])
{
NSMutableDictionary *mutaDic = [NSMutableDictionary dictionaryWithDictionary:value];
[self setValue:[mutaDic dictionaryWithOutNull] forKey:keyStr];
//return dic;
}
}
return self;
}