[[UIDevice currentDevice] systemVersion];

或者像这样检查版本

你可以从这里得到下面的宏。

if (SYSTEM_VERSION_GREATER_THAN_OR_EQUAL_TO(IOS_VERSION_3_2_0))      
{

        UIImageView *background = [[[UIImageView alloc] initWithImage:[UIImage imageNamed:@"cs_lines_back.png"]] autorelease];
        theTableView.backgroundView = background;

}

希望这能有所帮助

我知道现在回答这个问题已经太迟了。我不确定我的方法是否仍然适用于低iOS版本(< 5.0):

NSString *platform = [UIDevice currentDevice].model;

NSLog(@"[UIDevice currentDevice].model: %@",platform);
NSLog(@"[UIDevice currentDevice].description: %@",[UIDevice currentDevice].description);
NSLog(@"[UIDevice currentDevice].localizedModel: %@",[UIDevice currentDevice].localizedModel);
NSLog(@"[UIDevice currentDevice].name: %@",[UIDevice currentDevice].name);
NSLog(@"[UIDevice currentDevice].systemVersion: %@",[UIDevice currentDevice].systemVersion);
NSLog(@"[UIDevice currentDevice].systemName: %@",[UIDevice currentDevice].systemName);

你可以得到以下结果:

[UIDevice currentDevice].model: iPhone
[UIDevice currentDevice].description: <UIDevice: 0x1cd75c70>
[UIDevice currentDevice].localizedModel: iPhone
[UIDevice currentDevice].name: Someones-iPhone002
[UIDevice currentDevice].systemVersion: 6.1.3
[UIDevice currentDevice].systemName: iPhone OS

一个简单的检查iOS版本小于5(所有版本):

if([[[UIDevice currentDevice] systemVersion] integerValue] < 5){
        // do something
};

[[UIDevice currentDevice] systemVersion];

或者像这样检查版本

你可以从这里得到下面的宏。

if (SYSTEM_VERSION_GREATER_THAN_OR_EQUAL_TO(IOS_VERSION_3_2_0))      
{

        UIImageView *background = [[[UIImageView alloc] initWithImage:[UIImage imageNamed:@"cs_lines_back.png"]] autorelease];
        theTableView.backgroundView = background;

}

希望这能有所帮助

[[[UIDevice currentDevice] systemVersion] floatValue]

在MonoTouch:

要获得Major版本，请使用:

UIDevice.CurrentDevice.SystemVersion.Split('.')[0]

对于小版本使用:

UIDevice.CurrentDevice.SystemVersion.Split('.')[1]