1.storyboard 佈局時用代碼實現頁面跳轉:佈局
a> 獲取當前 storyboard : [self storyboard]
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b> 爲將要跳轉到的 viewController 添加 storyboard IDit
c> 經過 當前storyboard 和 將要跳轉到的頁面id (storyboard ID) , 獲取要跳轉的 UIViewControllerio
d> 經過 push 或者 模態 方式實現跳轉im
例子: UIViewController *vc = [[self storyboard] instantiateViewControllerWithIdentifier:@"loginBoard"];
[self.navigationController pushViewController:vc animated:YES];
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