Convert NSString value to double

Question

In my case, I have two NSString values. First one is Current_version and second one is Last_version. Current_version & Last_version value came from my html file. This 2 string contains value like this:

Last_version = 1.0.2
Current_version = 1.0.9

I want to convert value without losing any data. Now I want to display those version which are greater then last_version.

So I want to compare these two values.

These are not double (there are "two points"). You need to compare each part : major/minor/patch one by one. If `NSString *last_version = @"1.0.2";`, you can use `NSArray *lastVersionComponents = [last_version componentsSeparatedByString:@"."];` (same for current_version), and check `[lastVersionComponents[i] integerValue]` vs `[currentVersionCompoents[i] integerValue]`, where i in our case is 0, 1 or 2. — Larme, Oct 27 '16 at 12:14

score -2 · Answer 1 · answered Oct 27 '16 at 12:22

-2

NSString *lastVersionString = [Last_version stringByReplacingOccurrencesOfString:@"." withString:@""];
NSString *newVersionString =[Current_version stringByReplacingOccurrencesOfString:@"." withString:@""];
float current = [newVersionString floatValue];
float old = [lastVersionString floatValue];

answered Oct 27 '16 at 12:22

Matloob Hasnain

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No. Suppose `Current version is 1.1` and `last version is 1.0.9`. Then what to do – Yogendra Patel Oct 27 '16 at 12:25
If the versions are 1.0.22 and 1.0.1 ? – Larme Oct 27 '16 at 12:28
then you need to compare version number , http://stackoverflow.com/questions/1978456/compare-version-numbers-in-objective-c – Matloob Hasnain Oct 27 '16 at 12:30
instead of asking to convert it into float , – Matloob Hasnain Oct 27 '16 at 12:30

Convert NSString value to double

1 Answers1