无法居中 UIPopoverController答案

【问题标题】：Unable to center UIPopoverController无法居中 UIPopoverController
【发布时间】：2016-04-09 05:15:47
【问题描述】：

在我的应用程序中，我试图将 UIPopoverController 居中（我必须使用它，因为我的应用程序与 iOS 7 兼容）。我试图将其居中但没有成功。我的居中代码如下：

        SummaryViewController *summaryViewController = [[SummaryViewController alloc] init];
        summaryViewController.delegate = self;
        aPopover = [[UIPopoverController alloc] initWithContentViewController:summaryViewController];
        aPopover.popoverContentSize = CGSizeMake(summaryViewController.view.frame.size.width, summaryViewController.view.frame.size.height);

        CGFloat width = [[UIScreen mainScreen] bounds].size.width;
        CGFloat height = [[UIScreen mainScreen] bounds].size.height;
        CGFloat popoverWidth = summaryViewController.view.frame.size.width;
        CGFloat popoverHeight = summaryViewController.view.frame.size.height;

        CGRect rect = CGRectMake((width - popoverWidth) / 2.0, (height -popoverHeight) / 2.0, 1, 1);
        [aPopover presentPopoverFromRect:rect inView:self.view permittedArrowDirections:0 animated:YES];

它总是向我显示左角的弹出框... 这段代码有什么问题？

【问题讨论】：

仅供参考，rect in presentPopoverFromRect - 视图中用于锚定弹出窗口的矩形。

标签： ios ipad uipopovercontroller

【解决方案1】：

  SummaryViewController *summaryViewController = [[SummaryViewController alloc] init];
  summaryViewController.delegate = self;
  aPopover = [[UIPopoverController alloc] initWithContentViewController:summaryViewController];
  aPopover.popoverContentSize = CGSizeMake(summaryViewController.view.frame.size.width, summaryViewController.view.frame.size.height);

  CGFloat width = [[UIScreen mainScreen] bounds].size.width;
  CGFloat height = [[UIScreen mainScreen] bounds].size.height;
  CGFloat popoverWidth = summaryViewController.view.frame.size.width;
  CGFloat popoverHeight = summaryViewController.view.frame.size.height;

  CGRect rect = CGRectMake(self.view.bounds.size.width/2, self.view.bounds.size.height/2, 1, 1);
  [aPopover presentPopoverFromRect:rect inView:self.view permittedArrowDirections:0 animated:YES];

【讨论】：