background - 如何检查是否在 iOS 上启用了 BackgroundFetching？

Question

我想确定用户是否在 Preferences 应用程序中关闭了 Background Fetching。如果他将其关闭，我的应用程序将无法运行。

Answer 1

这是执行此操作的代码：

if ([[UIApplication sharedApplication] backgroundRefreshStatus] == UIBackgroundRefreshStatusAvailable) {

    NSLog(@"Background fetch is available for the app.");
}else if([[UIApplication sharedApplication] backgroundRefreshStatus] == UIBackgroundRefreshStatusDenied)
{
    NSLog(@"Background fetch for this app or for the whole system is disabled.");
}else if([[UIApplication sharedApplication] backgroundRefreshStatus] == UIBackgroundRefreshStatusRestricted)
{
    NSLog(@"Background updates are unavailable and the user cannot enable them again. For example, this status can occur when parental controls are in effect for the current user.");
}