How to define preprocessor macro to check iOS version - ios

Question

I use it to check iOS version, but it doesn't work:
#ifndef kCFCoreFoundationVersionNumber_iPhoneOS_5_0
#define kCFCoreFoundationVersionNumber_iPhoneOS_5_0 675.000000
#endif
#if __IPHONE_OS_VERSION_MAX_ALLOWED >= __IPHONE_5_0
#define IF_IOS5_OR_GREATER(...) \
if (kCFCoreFoundationVersionNumber >= kCFCoreFoundationVersionNumber_iPhoneOS_5_0) \
{ \
__VA_ARGS__ \
}
#else
#define IF_IOS5_OR_GREATER 0
#endif
when I make
#if IF_IOS5_OR_GREATER
NSLog(#"iOS5");
#endif
nothing happens. Is something wrong here?

Answer 1

Much simpler:
#define IS_IOS6_AND_UP ([[UIDevice currentDevice].systemVersion floatValue] >= 6.0)

Answer 2

#ifdef __IPHONE_5_0
etc
Just look for that constant. All the objective c constants start with two underscores

Answer 3

You've defined a macro, but you're using it in the non-macro way. Try something like this, with your same macro definition.
IF_IOS5_OR_GREATER(NSLog(#"iOS5");)
(This is instead of your #if/#endif block.)

Answer 4

Define this method:
+(BOOL)iOS_5 {
NSString *osVersion = #"5.0";
NSString *currOsVersion = [[UIDevice currentDevice] systemVersion];
return [currOsVersion compare:osVersion options:NSNumericSearch] == NSOrderedAscending;
}
Then define the macro as that method.

Answer 5

For a runtime check use something like this:
- (BOOL)iOSVersionIsAtLeast:(NSString*)version {
NSComparisonResult result = [[[UIDevice currentDevice] systemVersion] compare:version options:NSNumericSearch];
return (result == NSOrderedDescending || result == NSOrderedSame);
}
If you create a category on UIDevice for it, you can use it as such:
#implementation UIDevice (OSVersion)
- (BOOL)iOSVersionIsAtLeast:(NSString*)version {
NSComparisonResult result = [[self systemVersion] compare:version options:NSNumericSearch];
return (result == NSOrderedDescending || result == NSOrderedSame);
}
#end
...
if([[UIDevice currentDevice] iOSVersionIsAtLeast:#"6.0"]) self.navigationBar.shadowImage = [UIImage new];

Answer 6

#define isIOS7 ([[[UIDevice currentDevice]systemVersion]floatValue] > 6.9) ?1 :0