NSString对象的最大长度是多少？ [英] What is the maximum length of an NSString object?

问题描述

NSString对象中可以保存的最大字符串是多少？

What is the maximum sized string that can be held in a NSString object?

这是否会动态变化？

推荐答案

我认为NSString的硬限制是NSUIntegerMax字符，因为NSString的索引和与大小相关的方法返回NSUInteger。由于目前能够运行iOS的所有设备都是32位，这意味着NSUIntegerMax是2 ^ 32 - 1，NSString可以容纳超过42亿个字符。

I would assume the hard limit for NSString would be NSUIntegerMax characters, since NSString's index and size-related methods return an NSUInteger. Since all devices currently capable of running iOS are 32 bit, this means NSUIntegerMax is 2^32 - 1 and NSString can hold a little over 4.2 billion characters.

其他人有但是指出，实际限制要小得多 - 特别是在iOS设备上，在你达到NSString中的任何硬限制之前很久就会耗尽内存。

As others have pointed out, though, the practical limit is much smaller - on an iOS device especially, you'll run out of memory long before you hit any hard limit in NSString.

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