做一个弹出视图框的例子，点击一个按钮，弹出一个视图框[转]

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主要代码段：

second = [[SecondViewController alloc] init];

second.modalPresentationStyle = UIModalPresentationFormSheet;

second.modalTransitionStyle = UIModalTransitionStyleCrossDissolve;

[self presentModalViewController:second animated:YES];

[second.view.superview setFrame:CGRectMake(100, 100, 200, 200)];