怎么判断ios 版本

前几天工程项目要用到判断ios版本，最后研究了一下，分享一下：

 

-(void)getIOSVersion

{

// #if __IPHONE_OS_VERSION_MAX_ALLOWED >= 50000    //此方法和编译器相关

// quanju.iOSVersion=1;

// #endif 

float version = [[[UIDevice currentDevice] systemVersion] floatValue];  

if (version >= 5.0)  

{  

quanju.iOSVersion=1;//定义全局变量标记ios版本

}  

}

-(void)getIOSModel

{

CGSize sizeToRequest; 
if([[[UIDevicecurrentDevice] model] rangeOfString:@"iPad"].location== 0) 
sizeToRequest = CGSizeMake(748, 110); 
else 
sizeToRequest = CGSizeMake(320, 48); 

}

//下面是ios内其他相关信息的判断方法

获取进程信息和设备信息（包括设备类型，序列号，ios版本等） [[NSProcessInfo processInfo] globallyUniqueString], [[NSProcessInfo processInfo] hostName], [[NSProcessInfo processInfo] operatingSystemName], [[NSProcessInfo processInfo] operatingSystemVersionString], [[NSProcessInfo processInfo] physicalMemory], [[NSProcessInfo processInfo] processName]); —————————————————————————————— [UIDevice currentDevice].uniqueIdentifier, [UIDevice currentDevice].name, [UIDevice currentDevice].systemName, [UIDevice currentDevice].systemVersion, [UIDevice currentDevice].model, [UIDevice currentDevice].localizedModel, [UIDevice currentDevice].batteryLevel ___________________________________________________ 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