NSInternalInconsistencyException原因：' - [__ NSCFArray replaceObjectAtIndex：withObject：]：mutating方法发送到不可变对象'

Question

你可以帮我解决以下错误：

由于未捕获的异常'NSInternalInconsistencyException'而终止应用程序，原因：' - [__ NSCFArray replaceObjectAtIndex：withObject：]：mutating方法发送到不可变对象'

array_Info = [[NSMutableArray alloc] init];
array_Info = [dict_Temp objectForKey:@"Children"];

NSMutableArray *temp = [[NSMutableArray alloc] initWithArray:self.array_Info];

            int ran, arrayIndexing = 0;
            while ([temp count] != 0)
            {
                ran = arc4random();
                if(ran < 0)
                    ran*=-1;
                ran = ran % [temp count];

                if([temp count] == 1)
                    ran = 0;

                NSLog(@"%d  %d",arrayIndexing,ran);

                [self.array_Info replaceObjectAtIndex:arrayIndexing withObject:[temp objectAtIndex:ran]];

                [temp removeObjectAtIndex:ran];
                arrayIndexing++;
            }

Answer 1

假设array_Info是self.array_Info属性的支持变量，您应该将第二行更改为：

array_Info = [[dict_Temp objectForKey:@"Children"] mutableCopy];

这将为您提供replaceObjectAtIndex:withObject:电话所需的可变数组。

Answer 2

似乎self.array_Info是一个不可变数组。让它变得可变。