How to check iOS version?

Question

I want to check if the iOS version of the device is greater than 3.1.3 I tried things like:

[[UIDevice currentDevice].systemVersion floatValue]

but it does not work, I just want a:

if (version > 3.1.3) { }

How can I achieve this?

Answer 1

With Version class that is contained in nv-ios-version project (Apache License, Version 2.0), it is easy to get and compare iOS version. An example code below dumps the iOS version and checks whether the version is greater than or equal to 6.0.

// Get the system version of iOS at runtime.
NSString *versionString = [[UIDevice currentDevice] systemVersion];

// Convert the version string to a Version instance.
Version *version = [Version versionWithString:versionString];

// Dump the major, minor and micro version numbers.
NSLog(@"version = [%d, %d, %d]",
    version.major, version.minor, version.micro);

// Check whether the version is greater than or equal to 6.0.
if ([version isGreaterThanOrEqualToMajor:6 minor:0])
{
    // The iOS version is greater than or equal to 6.0.
}

// Another way to check whether iOS version is
// greater than or equal to 6.0.
if (6 <= version.major)
{
    // The iOS version is greater than or equal to 6.0.
}

Project Page: nv-ios-version
TakahikoKawasaki/nv-ios-version

Blog: Get and compare iOS version at runtime with Version class
Get and compare iOS version at runtime with Version class

Answer 2

I recommend:

if ([[[UIDevice currentDevice] systemVersion] floatValue] > 3.13) {
    ; // ...
}

credit: How to target a specific iPhone version?

Answer 3

float deviceOSVersion = [[[UIDevice currentDevice] systemVersion] floatValue];
float versionToBeCompared = 3.1.3; //(For Example in your case)

if(deviceOSVersion < versionToBeCompared)
   //Do whatever you need to do. Device version is lesser than 3.1.3(in your case)
else 
   //Device version should be either equal to the version you specified or above

Answer 4

Using the refered recommended way... if there is no definition in the header files, you can always get the versión printing it on console with a device of the desired IOS versión.

- (BOOL) isIOS8OrAbove{
    float version802 = 1140.109985;
    float version8= 1139.100000; // there is no def like NSFoundationVersionNumber_iOS_7_1 for ios 8 yet?
    NSLog(@"la version actual es [%f]", NSFoundationVersionNumber);
    if (NSFoundationVersionNumber >= version8){
        return true;
    }
    return false;
}

Answer 5

a bit late to the party but in light of iOS 8.0 out there this might be relevant:

if you can avoid using

[[UIDevice currentDevice] systemVersion]

Instead check for existence of of a method/class/whatever else.

if ([self.yourClassInstance respondsToSelector:@selector(<yourMethod>)]) 
{ 
    //do stuff 
}

I found it to be useful for location manager where I have to call requestWhenInUseAuthorization for iOS 8.0 but the method is not available for iOS < 8

Answer 6

if (floor(NSFoundationVersionNumber) > NSFoundationVersionNumber_iOS_6_1) {
        // Your code here
}

Where of course, NSFoundationVersionNumber_iOS_6_1 must be changed to by applicable for the iOS version you want to check. What I have now written will probably be used a lot when testing if a device is running iOS7 or a previous version.