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

Question

我喜欢确定用户是否在首选项应用程序中关闭了后台获取。如果他关闭它，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.");
}