NSDate *update = [[NSUserDefaults standardUserDefaults] objectForKey:APP_UPDATE_TIME];
CGFloat dayDifference;
if (update) {
dayDifference = [[NSDate date] timeIntervalSinceDate:update]/ 60.0/60.0/24.0;
}
if (!update || dayDifference > 2) {
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:[NSString stringWithFormat:@"更新提示V%@",systemVersionNo] message:config[@"releaseNotes"] delegate:self cancelButtonTitle:@"稍后升级" otherButtonTitles:@"立即更新", nil];
[alert show];
}
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