reason: '* -[NSCFArray insertObject:atIndex:]: mutating method sent to immutable object'
来源:互联网 发布:250bp进入编程 编辑:程序博客网 时间:2024/05/22 02:53
错误提示 :
* Terminating app due to uncaught exception ‘NSInternalInconsistencyException’, reason: ‘-[__NSCFArray removeObjectAtIndex:]: mutating method sent to immutable object’
错误分析:
看reason:后面的异常说明:意思是我把一个可变量对应的方法让一个不可变量来调用
mutating method(可变量对应的方法):是那些在创建后可以被更改的变量所拥有的method,比如NSMutableArray,NSMutableDictionary 等
immutable object(不可改变的变量):就是那些被创建后不能被改变的变量:比如 NSArray NSDictionary等;
我的Exception被报出来是因为我有一行错误代码
[listAry removeObjectAtIndex:indexPath.row];
这里,我的array是从一个不可改变的变量类型为NSDictionary得到的,
代码为:NSMutableArray *listAry = [self.listDic objectForKey:@”list”];
所以,listAry这里也是一个不可改变量(即使我声明用的是NSMutableArray),但显然removeObjectAtIndex是一个改变变量的操作,所以这是不允许的。
错误解决前: NSMutableArray *listAry = [[NSMutableArray alloc] initWithCapacity:0];
listAry = [self.listDic objectForKey:@"list"];
错误解决后:
NSMutableArray *listAry = [[NSMutableArray alloc] initWithCapacity:0];[listAry addObjectsFromArray:[self.listDic objectForKey:@"list"]];
再啰嗦一句原因:就是因为这个变量之前被赋值了,而无法把一个可变的方法固执给一个不可变的对象。
如有不正确,还望批评指正….
- reason: '* -[NSCFArray insertObject:atIndex:]: mutating method sent to immutable object'
- 关于问题:reason: '* -[NSCFArray insertObject:atIndex:]: mutating method sent to immutable..
- 关于问题:reason: '* -[NSCFArray insertObject:atIndex:]: mutating method sent to immutable..
- 关于问题:reason: '* -[NSCFArray insertObject:atIndex:]: mutating method sent to immutable..
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