- (void)viewDidLoad {

[super viewDidLoad];

NSString * systermVersion = [[UIDevice currentDevice] systemVersion];

NSString * systermVersionName = [[UIDevice currentDevice] systemName];

NSLog(@"systermVersion = %@",systermVersion);

NSLog(@"systermVersionName = %@",systermVersionName);

//? ? 2015-12-15 14:28:57.629 試煉[19620:3028281] systermVersion = 9.0

//? ? 2015-12-15 14:28:57.632 試煉[19620:3028281] systermVersionName = iPhone OS

}