如何檢查iOS上是否啓用了BackgroundFetching？

Question

我喜歡確定用戶是否在首選項應用中關閉了背景抓取。如果他關掉了我的應用程序將無法正常工作。

Answer 1

下面是代碼做到這一點：

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."); 
}