iOS怎么来实现关闭自动锁屏

怎么来设置[UIApplication sharedApplication]   idleTimerDisabled 属性来控制自动锁屏的效果

// 把设置idleTimerDisabled的代码放到applicationDidEnterBackground里还原系统设置

- (void)applicationDidEnterBackground:(UIApplication *)application {
    [[UIApplication sharedApplication] setIdleTimerDisabled:NO];
}

// 把设置idleTimerDisabled的代码放到applicationDidBecomeActive里取消自动锁屏效果

- (void)applicationDidBecomeActive:(UIApplication *)application {
 [[UIApplication sharedApplication] setIdleTimerDisabled:YES];
 }