设定时间让应用从后台回来是否重新启动应用
- (void)applicationDidEnterBackground:(UIApplication *)application
{
//保存进入后台的时间戳
NSDateFormatter * formatter = [[NSDateFormatter alloc]init];
[formatter setDateFormat:@"YYYY-MM-dd hh:mm:ss"];
NSString *lastLaunchTimeString = [formatter stringFromDate:[NSDate date]];
NSUserDefaults *def = [NSUserDefaults standardUserDefaults];
[def setObject:lastLaunchTimeString forKey:LAST_LAUNCH_TIME];
[def synchronize];
}
- (void)applicationWillEnterForeground:(UIApplication *)application
{
//对比进入后台的时间戳大于1小时则重新加载应用
NSUserDefaults *def = [NSUserDefaults standardUserDefaults];
NSString *lastLaunchTimeString = [def stringForKey:LAST_LAUNCH_TIME];
NSDateFormatter * formatter = [[NSDateFormatter alloc]init];
[formatter setDateFormat:@"YYYY-MM-dd hh:mm:ss"];
NSDate *lastTime = [formatter dateFromString:lastLaunchTimeString];
NSString *nowTimeString = [formatter stringFromDate:[NSDate date]];
NSDate *nowTime = [formatter dateFromString:nowTimeString];
NSTimeInterval interval = [nowTime timeIntervalSinceDate:lastTime];
if (interval > 3600) {
self.mainCtrl = nil;
self.mainCtrl.delegate = nil;
self.window.rootViewController = nil;
self.window = nil;
[self application:nil didFinishLaunchingWithOptions:nil];
}
}