- (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 试炼[19620:3028281] systermVersion = 9.0
// 2015-12-15 14:28:57.632 试炼[19620:3028281] systermVersionName = iPhone OS
}
