iOSのバージョン判定

deviceVersionUtility.h

#import <Foundation/Foundation.h>

CGFloat iOSVersion();
BOOL isIOSVersionOver(float v);
BOOL isIOSVersionOver_3_2();
BOOL isIOSVersionOver_5_0();

deviceVersionUtility.m

#import "deviceVersionUtility.h"

CGFloat iOSVersion()
{
    return [[[UIDevice currentDevice] systemVersion] floatValue];
}

/*
 if (isIOSVersionOver(5.0f)) {
    ...
 }
 */
BOOL isIOSVersionOver(float v)
{
    float version = iOSVersion();
    return version >= v;
}

BOOL isIOSVersionOver_3_2()
{
    float version = iOSVersion();
    return version >= 3.2f;
}

BOOL isIOSVersionOver_5_0()
{
    float version = iOSVersion();
    return version >= 5.0f;
}

new_gist_file_2

/**
 MACRO
 */
#define SYSTEM_VERSION_LESS_THAN(v) \
    ( [[[UIDevice currentDevice] systemVersion] compare:v options:NSNumericSearch] == NSOrderedAscending )

if (SYSTEM_VERSION_LESS_THAN(@"8.0")) {
    // iOS7
} else {
    // iOS8 -
}