macos - 使用 NSComboBox 和 controlTextDidEndEditing

Question

我有一个 NSComboBox，我正在尝试让它在用户选择名称时自动输入其他信息（费率、费率类型和国籍）。它有时有效，但在其他时候会导致错误。

这段代码：

- (void)controlTextDidEndEditing:(NSNotification *)aNotification{

    NSInteger index = [_nameBox indexOfItemWithObjectValue:[_nameBox stringValue]];
    _lblRate.stringValue =[[contents objectAtIndex:index] objectForKey:@"Rate"];

    NSInteger rateType =[[[contents objectAtIndex:index] objectForKey:@"RateType"] integerValue];
    [_rateTypeSwitcher setSelected:YES forSegment:rateType];

    [_nationalityMenu selectItemWithTitle:[[contents objectAtIndex:index] objectForKey:@"Nationality"]];

}

导致此错误：

Ignoring exception raised in void run_cocoa_block(void *): *** -[__NSArrayM objectAtIndex:]:
index 9223372036854775807 beyond bounds [0 .. 1]