改变状态栏颜色和锁屏状态

状态栏颜色

[[UIApplication sharedApplication] setStatusBarStyle:UIStatusBarStyleDefault];

[[UIApplication sharedApplication] setStatusBarStyle:UIStatusBarStyleLightContent];

锁屏状态

[[UIApplication sharedApplication] setIdleTimerDisabled:YES];

[[UIApplication sharedApplication] setIdleTimerDisabled:NO];