NSUserDefaults standardUserDefaults setObject:forKey:不适用于多值首选项 [英] NSUserDefaults standardUserDefaults setObject: forKey: not working for Multivalue preference

问题描述

我正在尝试执行以下任务

I am trying to do following task

[[NSUserDefaults standardUserDefaults] setObject:@"Dry" forKey:@"vesselType_preference"];
[[NSUserDefaults standardUserDefaults] synchronize];

我的"vesselType_preference"是多值属性，但是没有生效.请帮助这适用于其他类型的属性，但不适用于多值类型.

where my "vesselType_preference" is multivalue attribute, but it is not getting effected. Please help this is working for other type of attribute but not working for multivalue type.

谢谢

推荐答案

    NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];        
    if (![defaults objectForKey:@"vesselType_preference"])
    {
        [defaults setObject:@"Dry" forKey:@"vesselType_preference"];
    }
    [[NSUserDefaults standardUserDefaults] synchronize];

这应该有效.

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