Best current version, without need to deal with numeric search within NSString is to define macros
(See original answer: Check iPhone iOS Version)
Those macros do exist in github, see: https://github.com/carlj/CJAMacros/blob/master/CJAMacros/CJAMacros.h
Like this:
#define SYSTEM_VERSION_EQUAL_TO(v) ([[[UIDevice currentDevice] systemVersion] compare:v options:NSNumericSearch] == NSOrderedSame)
#define SYSTEM_VERSION_GREATER_THAN(v) ([[[UIDevice currentDevice] systemVersion] compare:v options:NSNumericSearch] == NSOrderedDescending)
#define SYSTEM_VERSION_GREATER_THAN_OR_EQUAL_TO(v) ([[[UIDevice currentDevice] systemVersion] compare:v options:NSNumericSearch] != NSOrderedAscending)
#define SYSTEM_VERSION_LESS_THAN(v) ([[[UIDevice currentDevice] systemVersion] compare:v options:NSNumericSearch] == NSOrderedAscending)
#define SYSTEM_VERSION_LESS_THAN_OR_EQUAL_TO(v) ([[[UIDevice currentDevice] systemVersion] compare:v options:NSNumericSearch] != NSOrderedDescending)
and use them like this:
if (SYSTEM_VERSION_LESS_THAN(@"5.0")) {
// code here
}
if (SYSTEM_VERSION_GREATER_THAN_OR_EQUAL_TO(@"6.0")) {
// code here
}
Outdated version below
to get OS version:
[[UIDevice currentDevice] systemVersion]
returns string, which can be turned into int/float via
-[NSString floatValue]
-[NSString intValue]
like this
Both values (floatValue, intValue) will be stripped due to its type, 5.0.1 will become 5.0 or 5 (float or int), for comparing precisely, you will have to separate it to array of INTs
check accepted answer here: Check iPhone iOS Version
NSString *ver = [[UIDevice currentDevice] systemVersion];
int ver_int = [ver intValue];
float ver_float = [ver floatValue];
and compare like this
NSLog(@"System Version is %@",[[UIDevice currentDevice] systemVersion]);
NSString *ver = [[UIDevice currentDevice] systemVersion];
float ver_float = [ver floatValue];
if (ver_float < 5.0) return false;
For Swift 4.0 syntax
below example is just checking if the device is of iOS11
or greater version.
let systemVersion = UIDevice.current.systemVersion
if systemVersion.cgFloatValue >= 11.0 {
//"for ios 11"
}
else{
//"ios below 11")
}