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UIAlertController *alertController = [UIAlertController alertControllerWithTitle:@"开始录制!" message:nil preferredStyle:UIAlertControllerStyleAlert];
        UIAlertAction *enterAction = [UIAlertAction actionWithTitle:@"确定" style:UIAlertActionStyleCancel handler:nil];
        [alertController addAction:enterAction];
        [self showDetailViewController:alertController sender:self];

警告框

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原文地址：http://www.cnblogs.com/Bo-tree/p/5161321.html