比较Objective-C中的版本号 [英] Compare version numbers in Objective-C

问题描述

我正在编写一个应用程序，接收带有项目和版本号的数据。数字格式为1.0.1或1.2.5。如何比较这些版本号？我认为他们必须格式化为字符串第一，没有？我必须确定1.2.5是否在1.0.1之后？

I am writing an application that receives data with items and version numbers. The numbers are formatted like "1.0.1" or "1.2.5". How can I compare these version numbers? I think they have to be formatted as a string first, no? What options do I have to determine that "1.2.5" comes after "1.0.1"?

推荐答案

比较版本的方式，记住1 1.0 1.0.0：

This is the simplest way to compare versions, keeping in mind that "1" < "1.0" < "1.0.0":

NSString* requiredVersion = @"1.2.0";
NSString* actualVersion = @"1.1.5";

if ([requiredVersion compare:actualVersion options:NSNumericSearch] == NSOrderedDescending) {
  // actualVersion is lower than the requiredVersion
}

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