UIAlertController繼承與UIViewController,用於替代UIAlertView和UIActionSheet,iOS8之後纔有的
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一,UIAlertView簡單用法
UIAlertView *alter = [[UIAlertView alloc] initWithTitle:@"提示" message:@"歡迎回來" delegate:self cancelButtonTitle:@"取消" otherButtonTitles:@"確定", @"再來一次", @"哈哈", nil];
alter.tag = 100;
[alter addButtonWithTitle:@"12"];
[alter show];
[alter release];