将Json数组传递到UIPickerView不起作用

Question

我从JSON获得数据。像这样

-(void)connectionDidFinishLoading:(NSURLConnection *)connection
{

   al=[NSJSONSerialization JSONObjectWithData:webData options:0 error:nil];
    NSLog(@"String String %@",al);

    for (array in al) {
        NSLog(@"array is  array %@",array);
    }
}

PickerView方法：-

- (NSInteger)numberOfComponentsInPickerView:
(UIPickerView *)pickerView
{
        return 1;
}

- (NSInteger)pickerView:(UIPickerView *)pickerView
      numberOfRowsInComponent:(NSInteger)component
{
        return array.count;
}

- (NSString *)pickerView:(UIPickerView *)pickerView
titleForRow:(NSInteger)row
forComponent:(NSInteger)component
{
    return array[row];
}

我尝试过这种方法，但它显示的PickerView为空。所以请给我任何想法。

我的Json这样：

[[1,"Hyd"],[2,"viz"]]

Answer 1

类似这样的方法应该起作用：

- (NSInteger)numberOfComponentsInPickerView:
(UIPickerView *)pickerView
{
      return [((NSArray *)array[0]) count]; // check for boundary conditions
}

- (NSInteger)pickerView:(UIPickerView *)pickerView
      numberOfRowsInComponent:(NSInteger)component
{
     return array.count;
}

- (NSString *)pickerView:(UIPickerView *)pickerView
titleForRow:(NSInteger)row
forComponent:(NSInteger)component
{
    return array[row][1]; // title exists at 1 index of each 2d array.
}