写了一个应用:
UIAlertView *alert = [[UIAlertView alloc]
initWithTitle:@"Icon Contest!"
message:@"Design a 1024 x 1024 pixels icon for Example. The best one will be on the app's icon! Send them to: example@example.com."
delegate:self
cancelButtonTitle:@"More Info"
otherButtonTitles:@"Yes",@"No", nil];
[alert show];
其中有最后期限,然后在一月31号结束时应用显示不同的警报。