Swift NSMutableArray再添加一个数组

问题描述：

问题是我第一次从 WebServices 获取数据，所以我已经在 TableView 上显示了此数据，然后用户滚动了下tableview然后再次调用 WebSevices 并将此数据再次添加到数组
中，但是当我尝试在nsmutable类型数组应用中再次添加数据时崩溃

The Problem is First time I get data from WebServices so I have show this data on TableView Then user scroller down tableview then again call WebSevices and add this data to again in array but when I try to add data again in nsmutable type array app is crashing

这是我的代码。有什么办法吗？

Here is my code. Any solution?

第一次数据加载正在工作

1st time Data load is Working

 var ary_mutable: NSMutableArray! 
 ary_mutable = NSMutableArray()
        ary_mutable=jsonResult as AnyObject as! NSMutableArray
                        self.tbl_T.reloadData();
                        self.tbl_T.delegate=self;
                        self.tbl_T.dataSource=self;

第二次加载数据并添加旧数组而无法正常工作

2nd Time data load and add with old array not Working

var myArray :NSArray!
                myArray = jsonResult as AnyObject as! NSArray
 ary_mutable.addObject(myArray.objectAtIndex(0))

此错误

[__NSCFArray insertObject:atIndex:]: mutating method sent to immutable object'

我也尝试过此代码，但不起作用

I have Try this code also But Not Working

ary_mutable.addObject(myArray)

答

您应该创建一个可变数组从一成不变。

You should create a mutable array from immutable. This:

ary_mutable=jsonResult as AnyObject as! NSMutableArray

不会这样做，它只是从一种类型到另一种类型的静态转换。您必须构造一个新的NSMutableArray，然后用所需的值填充它。

does not do it, it is just a static cast from one type to another. You have to construct a new NSMutableArray and then fill it with required values.

将代码更改为

var ary_mutable = NSMutableArray()

// everytime you receive a new data
ary_mutable.addObjectsFromArray(jsonResult as! [AnyObject])

Swift NSMutableArray再添加一个数组

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