ios – 向检索到的NSMutableArray添加新对象 – 返回NSInternalInconsistencyException

概述当我尝试将对象添加到检索到的NSMutableArray时,我不断收到此错误. Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: '-[__NSCFArray insertObject:atIndex:]: mutating method sent to immutable o 当我尝试将对象添加到检索到的NSMutableArray时,我不断收到此错误.

Terminating app due to uncaught exception 'NSInternalinconsistencyException',reason: '-[__NSCFArray insertObject:atIndex:]: mutating method sent to immutable object'

检索：

NSUserDefaults *userDefaults = [NSUserDefaults standardUserDefaults];    NSMutableArray *arrayOfTitles = [userDefaults objectForKey:@"mainArraySaveData"];    NSMutableArray *arrayOfSubjects = [userDefaults objectForKey:@"subjectArraySaveData"];    NSMutableArray *arrayOfDates = [userDefaults objectForKey:@"dateArraySaveData"];    _mutableArray=arrayOfTitles;    _subjectArray=arrayOfSubjects;    _dateArray=arrayOfDates;    [_tableVIEw reloadData];

保存：

NSUserDefaults *userDefaults = [NSUserDefaults standardUserDefaults];_mutableArray = [[NSMutableArray alloc] initWithArray:[userDefaults objectForKey:@"mainArraySaveData"]];[userDefaults setobject:_mutableArray forKey:@"mainArraySaveData"];[userDefaults synchronize];_dateArray = [[NSMutableArray alloc] initWithArray: [userDefaults objectForKey:@"dateArraySaveData"]];[userDefaults setobject:_dateArray forKey:@"dateArraySaveData"];[userDefaults synchronize];_subjectArray = [[NSMutableArray alloc] initWithArray: [userDefaults objectForKey:@"subjectArraySaveData"]];[userDefaults setobject:_subjectArray forKey:@"subjectArraySaveData"];[userDefaults synchronize];

我很困惑,因为我认为这是为了返回一个NSMutableArray,但它没有 – NSArray.我的问题是什么？
谢谢,SebOH

解决方法

I’m confused as I thought this was designed to return an NSMutableArray,but it says not – NSArray. What’s my issue?

NSUserDefaults的文档在objectForKey：方法的“特殊注意事项”部分中专门讨论了这个问题：

Special ConsIDerations

The returned object is immutable,even if the value you originally set was mutable.

修复这个问题很简单 – 使用mutablecopy：,initWithArray：或arrayWithArray：方法制作可变副本：

_mutableArray=[arrayOfTitles mutablecopy];                      // You can do this..._subjectArray=[NSMutableArray arrayWithArray:arrayOfSubjects];  // ...or this_dateArray=[[NSMutableArray alloc] initWithArray:arrayOfDates]; // ...or this.

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