Question

我从远程服务器中提取二维数组：

- (NSMutableArray*)qBlock{

NSURL *url = [NSURL URLWithString:@"http://wsome.php"];
NSError *error;
NSStringEncoding encoding;
NSString *response = [[NSString alloc] initWithContentsOfURL:url 
                                                usedEncoding:&encoding 
                                                       error:&error];
const char *convert = [response UTF8String];
NSString *responseString = [NSString stringWithUTF8String:convert];
NSMutableArray *sample = [responseString JSONValue];

return sample;
}

并将它们放入：

NSMutableArray *qnBlock1 = [self qBlock];
NSString *answer1 = [NSString stringWithFormat:[[qnBlock1 objectAtIndex:0]objectAtIndex:1]];
answer = [[NSMutableDictionary alloc]init];
[answer setObject:answer1 forKey:@"1"];

question1.text = [[qnBlock1 objectAtIndex:0] objectAtIndex:0];
label1a.text = [[qnBlock1 objectAtIndex:0]objectAtIndex:2];
label1b.text = [[qnBlock1 objectAtIndex:0]objectAtIndex:3];
label1c.text = [[qnBlock1 objectAtIndex:0]objectAtIndex:4];
label1d.text = [[qnBlock1 objectAtIndex:0]objectAtIndex:5];

我在运行时

收到此错误

-[__NSCFDictionary objectAtIndex:]: unrecognized selector sent to instance 0x6c179502012-04-30 09:43:50.794 AppName[371:f803] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[__NSCFDictionary objectAtIndex:]: unrecognized selector sent to instance 0x6c17950'

这是由于二维数组的语法问题吗？

Answer 1

你没有回到多维阵列。您将获得一组NSDictionary对象。您收到的错误表明您正在尝试将消息objectAtIndex:发送到NSDictionary对象，该对象失败，因为它没有这样的选择器。

<强>更新

在旁边聊天之后，很明显以下情况属实：

用户正在使用SBJson库来解析他的php Web服务的返回值。
返回值为：
- 一个NSDictionary，每个键是列表中（非“索引”）位置的文本表示形式（@“1”，@“2”等等），每个值都是NSString对象的NSArray ，或
- NSString对象的NSArray（似乎是单个“回答”返回的方式）

这是我提供的代码，让他迭代他的返回值：

NSURL *url = [NSURL URLWithString:@"{his url}"];
NSError *error;
NSStringEncoding encoding;
NSString *response = [[NSString alloc] initWithContentsOfURL:url usedEncoding:&encoding error:&error];
const char *convert = [response UTF8String];
NSString *responseString = [NSString stringWithUTF8String:convert];
NSLog(@"%@", responseString);
SBJsonParser *parser = [[SBJsonParser alloc] init];
id sample = [parser objectWithString:responseString];
if ([sample isKindOfClass:[NSDictionary class]]) {
    for (id item in sample) {
        NSLog(@"%@", [item description]);
        NSArray *subArray = [sample objectForKey:item]; // b/c I know it's an array
        for (NSString *str in subArray) {
            NSLog(@"item: %@", str);
        }
    }
} else if ([sample isKindOfClass:[NSArray class]]) {
    for (NSString *str in sample) {
        NSLog(@"item: %@", str);
    }
}

希望它有所帮助，J！

Answer 2

我认为从您的错误消息中，您将objectAtIndex发送到字典。 NSDictionary没有这样的方法。你应该使用objectForKey。

NSMutabel 2维阵列无法正常工作

2 个答案: