Question

我正在尝试从NSUserdefaults中检索NSMutableArray。代码给了我一个例外：

[__NSCFArray removeObjectAtIndex:]: mutating method sent to immutable object'

给我错误：

if let chatUsersJidArray = KUtility.getUserDefault(key: KChatUsersJid).mutableCopy() as? NSMutableArray

后来我使用下面的代码：

"Command failed due to signal:Segmentation fault:11"

然后{%ifequal ser_id 3%} <label for="inputMobile" id="field-label" class="col-lg-3 col-md-3 col-sm-3 col-xs-3 control-label">Subscriber Id:</label> {%else ifequal ser_id 5%} <label for="inputMobile" id="field-label" class="col-lg-3 col-md-3 col-sm-3 col-xs-3 control-label">Phone No:</label> {%else%} <label for="inputMobile" id="field-label" class="col-lg-3 col-md-3 col-sm-3 col-xs-3 control-label">Mobile No:</label> {%endif%} {%endifequal%}。任何帮助表示赞赏，我得到了许多其他解决方案，但没有使用可变副本。

Answer 1

尝试使用原生Swift Array结构。通过将其定义为var，它会自动变为可变

if var chatUsersJidArray = KUtility.getUserDefault(key: KChatUsersJid) as? [ARRAY_TYPE] {
    // use the chatUsersJidArray
}

Answer 2

直接从NSUserDefaults获取值不会返回Mutable个对象。为此，您需要抓取mutableCopy

if let chatUsersJidArray = KUtility.getUserDefault(key: KChatUsersJid) as? NSArray {
    var arrChatJidMutable = chatUsersJidArray.mutableCopy()
    //Now you can manipulate this array. Add / Remove / Update
}

由于信号命令失败：分段错误：11

2 个答案: