iOS 监听用户是否手动修改了设备时间

可以通过注册系统通知：UIApplicationSignificantTimeChangeNotification 去实现

- (void)observeUserDeviceTimeIsChanged
{
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(deviceTimeIsChanged) name:UIApplicationSignificantTimeChangeNotification object:nil];
}

- (void)deviceTimeIsChanged
{
NSLogI(@"用户手动调整了设备时间");
}

通过这个，我们可以获取用户改了时区、时间、24/12小时制的通知，但是信息内容有限，apple的解释是：“Posted when there is a significant change in time, for example, change to a new day
(midnight), carrier time update, and change to or from daylight savings time.

This notification does not contain a

userInfo

dictionary.”

即获取到的通知内容不携带userInfo 字典。