1、 首先創建兩個個基類UIBaseViewController和UIBaseTableViewController分別繼承於UIViewController和UITableViewController,然後其餘的所有對應類均繼均承於此兩個類
2、 在兩個基類viewdidload函數之中添加如下代碼:
NSComparisonResult order = [[UIDevice currentDevice].systemVersion compare: @"7.0" options: NSNumericSearch];
if (order == NSOrderedSame || order == NSOrderedDescending)
{
// OS version >= 7.0
self.edgesForExtendedLayout = UIRectEdgeNone;
}