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akisute/gist:5790904

Created June 16, 2013 05:41
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Great example code of how to detect major version of running iOS. Uses dispatch_once for performance.
Raw
gistfile1.m
NSUInteger DeviceSystemMajorVersion();
NSUInteger DeviceSystemMajorVersion() {
static NSUInteger _deviceSystemMajorVersion = -1;
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
_deviceSystemMajorVersion = [[[[[UIDevice currentDevice] systemVersion] componentsSeparatedByString:@"."] objectAtIndex:0] intValue];
});
return _deviceSystemMajorVersion;
}
#define MY_MACRO_NAME (DeviceSystemMajorVersion() < 7)
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