获取iphone系统版本号

为了使用版本号的问题,我搜了点资料,做点记录

NSLog([[UIDevice currentDevice] name]); // Name of the phone as named by user
NSLog([[UIDevice currentDevice] uniqueIdentifier]); // A GUID like string
NSLog([[UIDevice currentDevice] systemName]); // "iPhone OS"
NSLog([[UIDevice currentDevice] systemVersion]); // "2.2.1"
NSLog([[UIDevice currentDevice] model]); // "iPhone" on both devices
NSLog([[UIDevice currentDevice] localizedModel]); // "iPhone" on both devices
float version = [[[UIDevice currentDevice] systemVersion] floatValue];
if (version >= 4.0)
{
// iPhone 4.0 code here
} 

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