如何将字符串对象添加到NSMutableArray [英] How to add string objects to NSMutableArray

问题描述

我有一个名为randomSelection的NSMutableArray:

I have an NSMutableArray named randomSelection:

NSMutableArray *randomSelection;

然后，如果满足某些条件，我将尝试向该数组添加字符串:

I am then trying to add strings to this array if certain criteria are met:

[randomSelection addObject:@"string1"];

然后我尝试输出该字符串，以确定是否已添加该字符串:

I am then trying to output the string, to determine if it has added it:

NSString *test = [randomSelection objectAtIndex:0];
NSLog(test);

但是什么都没有输出到错误日志，我不知道为什么.

However nothing is being output to the error log and I can't figure out why.

感谢任何帮助/提示.

推荐答案

我认为您缺少为数组分配内存的方法.所以试试这个

I think you are missing to allocate the memory for array. So try this

NSMutableArray *randomSelection = [[NSMutableArray alloc] init];
[randomSelection addObject:@"string1"];
NSString *test = [randomSelection objectAtIndex:0];
NSLog(test);

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