Check iOS version at runtime?

Question

This is sort of a follow on from my last question. I am using beginAnimations:context: to setup an animation block to animate some UITextLabels. However I notic

Answer 1

Xcode 7 added the available syntax making this relatively more simple:

Swift:

if #available(iOS 9, *) {
    // iOS 9 only code
} 
else {
   // Fallback on earlier versions
}

Xcode 9 also added this syntax to Objective-C

Objective-C:

if (@available(iOS 9.0, *)) {
   // iOS 9 only code
} else {
   // Fallback on earlier versions
}

Answer 2

Put this in your Prefix.pch file

#define IOS_VERSION [[[[[UIDevice currentDevice] systemVersion] componentsSeparatedByString:@"."] firstObject] intValue]

And then you can check iOS versions like:

if(IOS_VERSION == 8)
{
     // Hello 8!
}
else
{
     // Hello some other version!
}

Off course if you can use feature detection (and it makes sense for your use case) you should do that.

Answer 3

Most of these solutions on here are so overkill. All you need to do is [[UIDevice currentDevice].systemVersion intValue]. This automatically removes the decimal, so there is no need to split the string.

So you can just check it like:

if ([[UIDevice currentDevice].systemVersion intValue] >= 8) {
    // iOS 8.0 and above
} else {
    // Anything less than iOS 8.0
}

You can also define a macro with this code:

#define IOS_VERSION [[UIDevice currentDevice].systemVersion intValue];

or even include your check:

#define IOS_8PLUS ([[UIDevice currentDevice].systemVersion intValue] >= 8)

Then you just need to do:

if (IOS_8PLUS) {
    // iOS 8.0 and above
} else {
    // Anything less than iOS 8.0
}

Answer 4

You can use the version of the Foundation framework to determine the current system version.

if (floor(NSFoundationVersionNumber) <= NSFoundationVersionNumber_iOS_6_1){

//for earlier versions

} else {

//for iOS 7

}

Answer 5

In many cases you do not need to check iOS version directly, instead of that you can check whether particular method is present in runtime or not.

In your case you can do the following:

if ([[UIView class] respondsToSelector:@selector(animateWithDuration:animations:)]){
// animate using blocks
}
else {
// animate the "old way"
}