Run task when app enter background.

原创于 2012-02-24 13:38:06 发布 · 557 阅读

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#application #resources #user #iphone #os

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本文介绍如何在iOS应用中设置VoIP后台模式，确保应用程序在后台时仍能接收到来电通知。主要内容包括在Info.plist文件中添加UIBackgroundModes键，并将其值设置为包含voip字符串的数组；此外还提供了applicationDidEnterBackground方法的具体实现代码。

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1. Add the UIBackgroundModes key to your application’s Info.plist file. Set the value of this key to an array that includes the voip string.

- (void)applicationDidEnterBackground:(UIApplication *)application
{
    /*
     Use this method to release shared resources, save user data, invalidate timers, and store enough application state information to restore your application to its current state in case it is terminated later.
     If your application supports background execution, this method is called instead of applicationWillTerminate: when the user quits.
     */

#if __IPHONE_OS_VERSION_MIN_REQUIRED >= 40000
    if([[UIDevice currentDevice] respondsToSelector:@selector(isMultitaskingSupported)] && [[UIDevice currentDevice] isMultitaskingSupported])
    {
        NSLog(@"Keep timeout alive");

        [application setKeepAliveTimeout:600 handler: ^{
            NSLog(@"applicationDidEnterBackground:: setKeepAliveTimeout:handler^");//task as you want to do
        }];
    }

#else
   LogInfo(@"applicationDidEnterBackground (Not supported)");
#endif

}