get os, app, build version info

gistfile1.m

- (void)osVersion
{
    NSString *targetVersion = @"6.0";
    
    NSString *osVersion = [[UIDevice currentDevice] systemVersion];
    NSLog(@"OSのバージョン:%@", osVersion);
    
    if ([osVersion compare:targetVersion options:NSNumericSearch] == NSOrderedAscending) {
        NSLog(@"iOS%@前のバージョン", osVersion);
    }
    
    if ([osVersion compare:targetVersion options:NSNumericSearch] == NSOrderedSame ||
        [osVersion compare:targetVersion options:NSNumericSearch] == NSOrderedDescending) {
        NSLog(@"iOS%@以降のバージョン", targetVersion);
    }
}

- (void)appVersion
{
    NSString *appVersion = [[[NSBundle mainBundle] infoDictionary] objectForKey:@"CFBundleShortVersionString"];
    NSLog(@"アプリバージョン:%@", appVersion);
}

- (void)buildNumber
{
    NSString *build = [[[NSBundle mainBundle] infoDictionary] objectForKey:@"CFBundleVersion"];
    NSLog(@"ビルドバージョン:%@", build);
}