iOS 버전 체크를 하는 올바른 코드

올바르지 못한 코드

if ([[[UIDevice currentDevice] systemVersion] floatValue] >= 7.0) {     // Load resources for iOS 7 or later } else {     // Load resources for iOS 6.1 or earlier }

 

사유

1: Version numbers aren’t always a simple floating-point number, for example “4.2.1” is a valid iOS version number.

2: You’re doing raw floating point comparison. Due to the finite precision of floating point numbers, your comparison may fail (or succeed) when you wouldn’t otherwise expect it to. – Mac

 

좋은 코드

 

if (floor(NSFoundationVersionNumber) <= NSFoundationVersionNumber_iOS_6_1)

{

    // Load resources for iOS 6.1 or earlier

}

else

{

    // Load resources for iOS 7 or later

}

 

f ([우리가쓸패키지 isIOS7OrHigher])

{

    // Load resources for iOS 7 or later

}

else

{

    // Load resources for iOS 6.1 or lower

}