CODEWITHSUNDEEP
iosobjective-ciphonec-preprocessor
Bartosz Bialecki
Bartosz Bialecki

Reputation: 4451

How to define preprocessor macro to check iOS version

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?

Upvotes: 7

Views: 29162

Answers (6)

Sarthak Patel
Sarthak Patel

Reputation: 129

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

Upvotes: 1

Gowiem
Gowiem

Reputation: 1408

Much simpler: 

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

Upvotes: 15

James
James

Reputation: 2376

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.

Upvotes: 5

dankrusi
dankrusi

Reputation: 86

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];

Upvotes: 2

Joel Teply
Joel Teply

Reputation: 3296

#ifdef __IPHONE_5_0

etc

Just look for that constant. All the objective c constants start with two underscores

Upvotes: 10

Cajunluke
Cajunluke

Reputation: 3113

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.)

Upvotes: 5

Related Questions