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这个问题已被重新编写，因为我认为它与视图和图层的关系比原来的“寻找表格视图的中心”更多。也希望能找到另一个答案。

有问题的是一组 4 个视图，用于在表格视图中的选项卡栏中显示活动。

首次展示

的代码：

NSLog(@"view.center: %@", self.view.center);
NSLog(@"view.frame: %@", self.view.frame);

在第一次显示“加载”时产生：

view.center: {160, 250}
view.frame: {{0, 20}, {320, 460}}

对于第二个（及后续）显示：（在弹出日期选择器之后）

view.center: {160, 205.5}
view.frame: {{0, 0}, {320, 411}}

Self (ListViewController) 是 UITableViewController 的子类。因此，视图（或表格视图）框架的高度正在发生变化。为什么？

我一直在探索并在调试器中找到了这个信息，这似乎很相关。

--- Before ---
[self parentViewController]:
              <UITabBarController: 0x6e115a0>
[[self parentViewController] view]:
              <UILayoutContainerView: 0x6e1b750; frame = (0 0; 320 480); autoresize = W+H; layer = <CALayer: 0x6e0c8f0>>
self:         <ListsViewController: 0x6e13730>
[self tableView]: 
              <UITableView: 0x71e4000; frame = (0 20; 320 460); clipsToBounds = YES; opaque = NO; autoresize = W+H; layer = <CALayer: 0x6834db0>; contentOffset: {0, 0}>
[[self view] subviews]:  (array)
              <UIImageView: 0x6825e30; frame = (0 453; 320 7); alpha = 0; opaque = NO; autoresize = TM; userInteractionEnabled = NO; layer = <CALayer: 0x6835a90>>,
              <UIImageView: 0x68314e0; frame = (313 411; 7 20); alpha = 0; opaque = NO; autoresize = LM; userInteractionEnabled = NO; layer = <CALayer: 0x683d120>>,
              <UIView: 0x6a054f0; frame = (0 0; 320 460); alpha = 0.4; tag = 12; layer = <CALayer: 0x6a07840>>,
              <UIView: 0x6a04c60; frame = (110 155.5; 100 100); alpha = 0.6; tag = 13; layer = <CALayer: 0x6a073c0>>,
              <UILabel: 0x6a07480; frame = (110 200.5; 100 50); text = 'Loading ...'; clipsToBounds = YES; userInteractionEnabled = NO; tag = 14; layer = <CALayer: 0x6a065b0>>,
              <UIActivityIndicatorView: 0x6a07a80; frame = (140 167.5; 40 40); tag = 15; layer = <CALayer: 0x6a07b40>>

--- After datepicker ---
[self parentViewController]:
              <UITabBarController: 0x6e115a0>
[self parentViewController] view]:
              <UILayoutContainerView: 0x6e1b750; frame = (0 0; 320 480); autoresize = W+H; layer = <CALayer: 0x6e0c8f0>> 
self:         <ListsViewController: 0x6e13730>
[self tableView]:
              <UITableView: 0x71e4000; frame = (0 0; 320 411); clipsToBounds = YES; opaque = NO; autoresize = W+H; layer = <CALayer: 0x6834db0>; contentOffset: {0, 0}>
[[self view] subviews]:
              <DetailTableViewCell: 0xb642120; baseClass = UITableViewCell; frame = (0 369; 320 44); autoresize = W; layer = <CALayer: 0xb642230>>,
              <DetailTableViewCell: 0xb643850; baseClass = UITableViewCell; frame = (0 325; 320 44); autoresize = W; layer = <CALayer: 0xb643960>>,
              <DetailTableViewCell: 0xb6435c0; baseClass = UITableViewCell; frame = (0 281; 320 44); autoresize = W; layer = <CALayer: 0xb6436d0>>,
              <DetailTableViewCell: 0xb63cf30; baseClass = UITableViewCell; frame = (0 237; 320 44); autoresize = W; layer = <CALayer: 0xb63d130>>,
              <DetailTableViewCell: 0x6a14050; baseClass = UITableViewCell; frame = (0 193; 320 44); autoresize = W; layer = <CALayer: 0x6a16fb0>>,
              <DetailTableViewCell: 0x6a13760; baseClass = UITableViewCell; frame = (0 149; 320 44); autoresize = W; layer = <CALayer: 0x6a13870>>,
              <DetailTableViewCell: 0x6a10920; baseClass = UITableViewCell; frame = (0 105; 320 44); autoresize = W; layer = <CALayer: 0x6a10010>>,
              <DetailTableViewCell: 0xb63ce20; baseClass = UITableViewCell; frame = (0 60; 320 45); autoresize = W; layer = <CALayer: 0xb63c3e0>>,
              <UIImageView: 0x6825e30; frame = (0 404; 320 7); alpha = 0; opaque = NO; autoresize = TM; userInteractionEnabled = NO; layer = <CALayer: 0x6835a90>>,
              <UIView: 0xb6477f0; frame = (0 0; 320 60); autoresize = W; layer = <CALayer: 0xb647820>>,
              <UIImageView: 0x68314e0; frame = (313 411; 7 20); alpha = 0; opaque = NO; autoresize = LM; userInteractionEnabled = NO; layer = <CALayer: 0x683d120>>,
              <UIView: 0x6a098a0; frame = (0 0; 320 411); alpha = 0; tag = 9; animations = { opacity <CABasicAnimation: 0xb6279f0>; }; layer = <CALayer: 0x6a154b0>>,
              <UIDatePicker: 0x6a23350; frame = (0 455; 320 216); tag = 10; animations = { position <CABasicAnimation: 0xb63bd40>; }; layer = <CALayer: 0x6a20590>>,
              <UIToolbar: 0x6843f60; frame = (0 411; 320 44); opaque = NO; tag = 11; animations = { position=<CABasicAnimation: 0xb645f80>; }; layer = <CALayer: 0x6844a20>>,
              <UIView: 0xb60baa0; frame = (0 0; 320 411); alpha = 0.4; tag = 12; layer = <CALayer: 0xb626af0>>,
              <UIView: 0xb626b20; frame = (110 155.5; 100 100); alpha = 0.6; tag = 13; layer = <CALayer: 0xb626930>>,
              <UILabel: 0xb60cfb0; frame = (110 200.5; 100 50); text = 'Loading ...'; clipsToBounds = YES; userInteractionEnabled = NO; tag = 14; layer = <CALayer: 0xb60d020>>,
              <UIActivityIndicatorView: 0xb649e20; frame = (140 167.5; 40 40); tag = 15; layer = <CALayer: 0xb626960>>
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1 回答 1

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您可以使用 tableview.frame 访问原点及其尺寸。您可以使用 tablview.center 这是一个 CGPoint ，它为您提供对象的中心点。

于 2012-04-22T09:07:17.923 回答