如何在iphone sdk 3.0中实现后台任务的守护进程？

Question

像qik.com或ustream.com一样,当他们将内容从iphone上传到服务器时,它可以通过守护进程运行.因此,即使退出应用程序,任务仍然在使用后台守护程序.是否有任何方法可以以相同的方式实现守护进程？谢谢 !!!

Answer 1

iPhone OS不允许您添加后台进程.

Answer 2

更有可能的是,在退出时,他们保存状态,然后在启动恢复他们转移.

Answer 3

在applicationWillTerminate处阻止线程:不会在短时间内被杀死,但App Store会拒绝.对于非AppStore或个人应用程序,这里是代码:

@interface MyApplication : UIApplication
{
    BOOL _isApplicationSupposedToTerminate;
}
@property (assign) BOOL isApplicationSupposedToTerminate;
- (void)_terminateWithStatus:(int)status;
@end


@implementation MyApplication
@synthesize isApplicationSupposedToTerminate = _isApplicationSupposedToTerminate;
- (void)_terminateWithStatus:(int)status
{
    if (self.isApplicationSupposedToTerminate) {
        [super _terminateWithStatus:status];
    }
    else {
        return;
    }
}
@end

在main.m

    int retVal = UIApplicationMain(argc, argv, @"MyApplication", nil);

代表:

- (void)applicationWillTerminate:(UIApplication *)application
{
    [(MyApplication*)application setIsApplicationSupposedToTerminate:!kIsTransferDone];
}

这将阻止申请终止,除非您的转移已完成.设置检查超时的计时器很重要.在applicationDidReceiveMemoryWarning:中,通过以下方式退出您的应用:

- (void)applicationDidReceiveMemoryWarning:(UIApplication *)application { [(MyApplication*)application setIsApplicationSupposedToTerminate:YES]; [application terminateWithSuccess]; }

这应该可以让你完成你的工作.仅限越狱.