同时旋转2个组件时Uipicker崩溃

Question

如果我同时旋转2个组件，偶尔依赖于选择哪个数组，则下面的代码会造成崩溃，这些值将超出范围

我需要一些条件检查来阻止崩溃，但不知道怎么做

任何人都可以建议合适的代码来处理条件以避免崩溃

感谢

- (void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component{

    // Only calls the following code if component "0" has changed.
        if (component == 0) 
        {

            // Sets the global integer "component0Row" to the currently selected row of component "0"
            component0Row  = row;

            // Loads the new values for the selector into a new array in order to reload the data.
            NSDictionary *newDict = [[NSDictionary alloc]initWithDictionary:[pickerData objectForKey:[Letters objectAtIndex:component0Row]]];

            NSArray *sortArray = [[NSArray alloc]initWithArray:[newDict allKeys]];

            NSMutableArray *newValues = [[NSMutableArray alloc]initWithArray:[sortArray sortedArrayUsingSelector:@selector(localizedStandardCompare:)]];

            self.Numbers = newValues;

            component1Row = 0;
            [self.myPicker selectRow:0 inComponent:1 animated:NO];

            [newDict release];
            [sortArray release];
            [newValues release];
        }
        if(component ==1)
        {
            component0Row = [pickerView selectedRowInComponent:0];
            component1Row =row;
        }
}

Answer 1

问题可能出在titleForRow方法或numberOfRows方法中。你必须确保你没有超出所讨论数组的范围。