示例代码如下：
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- (IBAction)modal:(id)sender {
UIStoryboard * sb = [UIStoryboard storyboardWithName:@"Main" bundle:nil];
ModalViewController * mvc = [sb instantiateViewControllerWithIdentifier:@"ModalViewController"];
self.definesPresentationContext = YES;//允许设置模态跳转的样式
mvc.modalPresentationStyle = UIModalPresentationOverCurrentContext;//设置模态跳转的样式
[self presentViewController:mvc animated:true completion:nil];
}
运行结果：
