问:
I want to check if the iOS version of the device is greater then the 3.1.3 I tried things like [[UIDevice currentDevice].systemVersion floatValue]
but does not work, I just want a if (version > 3.1.3) { }
Does anybody know how to do this?
Thanks
答:
You can get the OS version using:
[[UIDevice currentDevice] systemVersion]
However, you should avoid relying on the version string as an indication of device or OS capabilities. There is usually a more reliable method of checking whether a particular feature or class is available. For example, you can check if UIPopoverController
is available on the current device usingNSClassFromString
:
if(NSClassFromString(@"UIPopoverController")) { // Do something }
Some classes, like CLLocationManager
and UIDevice
, provide methods to check device capabilities:
if([CLLocationManager headingAvailable]) { // Do something }
Apple uses systemVersion
in their GLSprite sample code, so my recommendation can't be absolute:
// A system version of 3.1 or greater is required to use CADisplayLink. The NSTimer // class is used as fallback when it isn't available. NSString *reqSysVer = @"3.1"; NSString *currSysVer = [[UIDevice currentDevice] systemVersion]; if ([currSysVer compare:reqSysVer options:NSNumericSearch] != NSOrderedAscending) displayLinkSupported = TRUE;
Important Note: If for whatever reason you decide that systemVersion
is what you want, make sure to treat it as an string or you risk truncating the minor revision number (eg. 3.1.2 -> 3.1).