[__NSCFArray insertObject:atIndex:]: mutating method sent to immutable objec
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报错!!!!!
[__NSCFArray insertObject:atIndex:]: mutating method sent to immutable objec
问题解释
将一个可变的方法 发送给了一个不可变的对象
问题背景
1.在一个UITableview中,使用沙盒存储可变的数据源数组
2.然后退出列表所在的控制器,再返回时从沙盒再读取这个数据源数组
3.通过方法再次改变这个数据源的时候,
弹出[__NSCFArray insertObject:atIndex:]: mutating method sent to immutable objec 错误
分析原因
1.沙盒存储只能存储基本类型,int string 字典 数组等 均是不可变的
2.因此在存储时候,将例子中的数据源数组 转化为了不可变数据
3.当再次获取的时候,其实获取的数据源数组本质是不可变数组
4.因此在再次addSubject的时候 ,就提示 “将一个可变的方法 发送给了一个不可变的对象”
解决的办法
重新定义数据源数组的类型
-(void)viewWillAppear:(BOOL)animated{ [super viewWillAppear:animated]; NSMutableArray *arr = (NSMutableArray*)[[NSUserDefaults standardUserDefaults] objectForKey:@"save_blueToothNumberSaveArray"]; if (arr) { _blueToothNumberSaveArray = [[NSMutableArray alloc] initWithArray:arr]; }else{ } [_myCreditCardMachineTableView reloadData];}
问题解决
0 0
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