testVC.modalPresentationStyle = UIModalPresentationFormSheet; 更改 VC大小

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TestViewController *testVC = [[TestViewController alloc] initWithNibName:@"TestViewController" bundle:nil];
    testVC.modalPresentationStyle = UIModalPresentationFormSheet;
    testVC.modalTransitionStyle = UIModalTransitionStyleCrossDissolve;
    [self presentModalViewController:testVC animated:YES];
    testVC.view.superview.frame = CGRectMake(0, 0, 649, 397);//it's important to do this after presentModalViewController
    testVC.view.superview.center = self.view.center;

注意：/it's important to do this after presentModalViewController

 TestViewController *testVC = [[TestViewController alloc] initWithNibName:@"TestViewController" bundle:nil];
    testVC.modalPresentationStyle = UIModalPresentationFormSheet;
    testVC.modalTransitionStyle = UIModalTransitionStyleCrossDissolve;
    [self presentModalViewController:testVC animated:YES];
    testVC.view.superview.frame = CGRectMake(0, 0, 649, 397);//it's important to do this after presentModalViewController
....... 

K，问题解决。。。还一定要在[self presentModalViewController:testVC animated:YES];之后设置frame的大小！！