我试图弄清楚如何在 UIViewController 上使用约束（在 UINavigationController 内的 UITabBarController 内）......超过一千字，这就是我想要做的......
实际上，第一个是 100px 高度，无论方向如何，第二个是一个广告（纵向 50px，横向 32px），最后一个 tableView 将占据其余部分。
到目前为止，这是我的代码：
PMMainProfilHeader *profilHeader = [[PMMainProfilHeader alloc] init];
[self.view addSubview:profilHeader];
[profilHeader release];
UIView *adTest = [[UIView alloc] initWithFrame:CGRectMake(0, 0, self.view.frame.size.width, 50)];
adTest.backgroundColor = [UIColor redColor];
[self.view addSubview:adTest];
[adTest release];
_tableView = [[UITableView alloc] initWithFrame:CGRectMake(0, 0, self.view.frame.size.width, self.view.frame.size.height)];
[self.view addSubview:_tableView];
[_tableView release];
[self.view addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|-0-[profilHeader]-0-|"
options:0
metrics:nil
views:NSDictionaryOfVariableBindings(profilHeader)]];
[self.view addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|-0-[adTest]-0-|"
options:0
metrics:nil
views:NSDictionaryOfVariableBindings(adTest)]];
[self.view addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|-0-[_tableView]-0-|"
options:0
metrics:nil
views:NSDictionaryOfVariableBindings(_tableView)]];
[self.view addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"V:|-0-[profilHeader]-0-[adTest]-0-[_tableView]-0-|"
options:0
metrics:nil
views:NSDictionaryOfVariableBindings(profilHeader, adTest, _tableView)]];
但当然它不起作用......而且我不知道为什么，当我恢复调试几次时，我从调试器中得到了这条评论：
2013-02-22 00:17:13.207 MyApplication[6822:907] Unable to simultaneously satisfy constraints.
Probably at least one of the constraints in the following list is one you don't want. Try this: (1) look at each constraint and try to figure out which you don't expect; (2) find the code that added the unwanted constraint or constraints and fix it. (Note: If you're seeing NSAutoresizingMaskLayoutConstraints that you don't understand, refer to the documentation for the UIView property translatesAutoresizingMaskIntoConstraints)
(
"<NSLayoutConstraint:0x1d0b20d0 H:[UIView:0x1d0ae7e0]-(0)-| (Names: '|':UIView:0x1c596de0 )>",
"<NSLayoutConstraint:0x1d0b2090 H:|-(0)-[UIView:0x1d0ae7e0] (Names: '|':UIView:0x1c596de0 )>",
"<NSLayoutConstraint:0x1d0b2000 H:[PMMainProfilHeader:0x1d09f5b0]-(0)-| (Names: '|':UIView:0x1c596de0 )>",
"<NSLayoutConstraint:0x1d0b2320 H:|-(0)-[PMMainProfilHeader:0x1d09f5b0] (Names: '|':UIView:0x1c596de0 )>",
"<NSAutoresizingMaskLayoutConstraint:0x1c5dcb10 h=--& v=--& UIView:0x1d0ae7e0.midX ==>",
"<NSAutoresizingMaskLayoutConstraint:0x1c5daf80 h=--& v=--& PMMainProfilHeader:0x1d09f5b0.midX == + 160>"
)
Will attempt to recover by breaking constraint
<NSLayoutConstraint:0x1d0b20d0 H:[UIView:0x1d0ae7e0]-(0)-| (Names: '|':UIView:0x1c596de0 )>
Break on objc_exception_throw to catch this in the debugger.
The methods in the UIConstraintBasedLayoutDebugging category on UIView listed in <UIKit/UIView.h> may also be helpful.
2013-02-22 00:17:41.706 MyApplication[6822:907] Unable to simultaneously satisfy constraints.
Probably at least one of the constraints in the following list is one you don't want. Try this: (1) look at each constraint and try to figure out which you don't expect; (2) find the code that added the unwanted constraint or constraints and fix it. (Note: If you're seeing NSAutoresizingMaskLayoutConstraints that you don't understand, refer to the documentation for the UIView property translatesAutoresizingMaskIntoConstraints)
(
"<NSLayoutConstraint:0x1c5ab460 V:[PMMainProfilHeader:0x1d09f5b0]-(0)-[UIView:0x1d0ae7e0]>",
"<NSLayoutConstraint:0x1c5ab3f0 V:|-(0)-[PMMainProfilHeader:0x1d09f5b0] (Names: '|':UIView:0x1c596de0 )>",
"<NSAutoresizingMaskLayoutConstraint:0x1c5dcca0 h=--& v=--& UIView:0x1d0ae7e0.midY ==>",
"<NSAutoresizingMaskLayoutConstraint:0x1c5db050 h=--& v=--& PMMainProfilHeader:0x1d09f5b0.midY == + 50>"
)
Will attempt to recover by breaking constraint
<NSLayoutConstraint:0x1c5ab460 V:[PMMainProfilHeader:0x1d09f5b0]-(0)-[UIView:0x1d0ae7e0]>
Break on objc_exception_throw to catch this in the debugger.
The methods in the UIConstraintBasedLayoutDebugging category on UIView listed in <UIKit/UIView.h> may also be helpful.
2013-02-22 00:17:43.382 MyApplication[6822:907] Unable to simultaneously satisfy constraints.
Probably at least one of the constraints in the following list is one you don't want. Try this: (1) look at each constraint and try to figure out which you don't expect; (2) find the code that added the unwanted constraint or constraints and fix it. (Note: If you're seeing NSAutoresizingMaskLayoutConstraints that you don't understand, refer to the documentation for the UIView property translatesAutoresizingMaskIntoConstraints)
(
"<NSAutoresizingMaskLayoutConstraint:0x1d0c0530 h=--& v=--& UITableView:0x1db44600.midX ==>",
"<NSLayoutConstraint:0x1c5ab160 H:[UITableView:0x1db44600]-(0)-| (Names: '|':UIView:0x1c596de0 )>",
"<NSLayoutConstraint:0x1c5ab120 H:|-(0)-[UITableView:0x1db44600] (Names: '|':UIView:0x1c596de0 )>",
"<NSLayoutConstraint:0x1d0b2000 H:[PMMainProfilHeader:0x1d09f5b0]-(0)-| (Names: '|':UIView:0x1c596de0 )>",
"<NSLayoutConstraint:0x1d0b2320 H:|-(0)-[PMMainProfilHeader:0x1d09f5b0] (Names: '|':UIView:0x1c596de0 )>",
"<NSAutoresizingMaskLayoutConstraint:0x1c5daf80 h=--& v=--& PMMainProfilHeader:0x1d09f5b0.midX == + 160>"
)
Will attempt to recover by breaking constraint
<NSLayoutConstraint:0x1c5ab160 H:[UITableView:0x1db44600]-(0)-| (Names: '|':UIView:0x1c596de0 )>
Break on objc_exception_throw to catch this in the debugger.
The methods in the UIConstraintBasedLayoutDebugging category on UIView listed in <UIKit/UIView.h> may also be helpful.
2013-02-22 00:17:45.290 MyApplication[6822:907] Unable to simultaneously satisfy constraints.
Probably at least one of the constraints in the following list is one you don't want. Try this: (1) look at each constraint and try to figure out which you don't expect; (2) find the code that added the unwanted constraint or constraints and fix it. (Note: If you're seeing NSAutoresizingMaskLayoutConstraints that you don't understand, refer to the documentation for the UIView property translatesAutoresizingMaskIntoConstraints)
(
"<NSAutoresizingMaskLayoutConstraint:0x1c5dcce0 h=--& v=--& V:[UIView:0x1d0ae7e0(0)]>",
"<NSLayoutConstraint:0x1c5ab510 V:[UITableView:0x1db44600]-(0)-| (Names: '|':UIView:0x1c596de0 )>",
"<NSLayoutConstraint:0x1c5ab4b0 V:[UIView:0x1d0ae7e0]-(0)-[UITableView:0x1db44600]>",
"<NSAutoresizingMaskLayoutConstraint:0x1c5ed510 h=-&- v=-&- UILayoutContainerView:0x1c5d1440.height == UIWindow:0x1c564480.height>",
"<NSAutoresizingMaskLayoutConstraint:0x1c5ef2e0 h=--- v=--- V:[UIWindow:0x1c564480(480)]>",
"<NSAutoresizingMaskLayoutConstraint:0x1c5eb9e0 h=-&- v=-&- UINavigationTransitionView:0x1c5d2b20.height == UILayoutContainerView:0x1c5d1440.height>",
"<NSAutoresizingMaskLayoutConstraint:0x1c5e9f80 h=-&- v=-&- UIViewControllerWrapperView:0x1d0ba580.height == UINavigationTransitionView:0x1c5d2b20.height>",
"<NSAutoresizingMaskLayoutConstraint:0x1c5e8610 h=-&- v=-&- UILayoutContainerView:0x1d096c30.height == UIViewControllerWrapperView:0x1d0ba580.height>",
"<NSAutoresizingMaskLayoutConstraint:0x1c5e6ed0 h=-&- v=-&- UITransitionView:0x1d0999d0.height == UILayoutContainerView:0x1d096c30.height - 49>",
"<NSAutoresizingMaskLayoutConstraint:0x1c5e5980 h=-&- v=-&- UIViewControllerWrapperView:0x1c5cb7a0.height == UITransitionView:0x1d0999d0.height - 20>",
"<NSAutoresizingMaskLayoutConstraint:0x1d0c0710 h=--& v=--& UITableView:0x1db44600.midY ==>",
"<NSAutoresizingMaskLayoutConstraint:0x1c5e4270 h=-&- v=-&- UIView:0x1c596de0.height == UIViewControllerWrapperView:0x1c5cb7a0.height>",
"<NSAutoresizingMaskLayoutConstraint:0x1c5dcca0 h=--& v=--& UIView:0x1d0ae7e0.midY ==>"
)
Will attempt to recover by breaking constraint
<NSLayoutConstraint:0x1c5ab4b0 V:[UIView:0x1d0ae7e0]-(0)-[UITableView:0x1db44600]>
Break on objc_exception_throw to catch this in the debugger.
The methods in the UIConstraintBasedLayoutDebugging category on UIView listed in <UIKit/UIView.h> may also be helpful.
2013-02-22 00:17:48.283 MyApplication[6822:907] Unable to simultaneously satisfy constraints.
Probably at least one of the constraints in the following list is one you don't want. Try this: (1) look at each constraint and try to figure out which you don't expect; (2) find the code that added the unwanted constraint or constraints and fix it. (Note: If you're seeing NSAutoresizingMaskLayoutConstraints that you don't understand, refer to the documentation for the UIView property translatesAutoresizingMaskIntoConstraints)
(
"<NSLayoutConstraint:0x1c5ab510 V:[UITableView:0x1db44600]-(0)-| (Names: '|':UIView:0x1c596de0 )>",
"<NSAutoresizingMaskLayoutConstraint:0x1c5ed510 h=-&- v=-&- UILayoutContainerView:0x1c5d1440.height == UIWindow:0x1c564480.height>",
"<NSAutoresizingMaskLayoutConstraint:0x1c5ef2e0 h=--- v=--- V:[UIWindow:0x1c564480(480)]>",
"<NSAutoresizingMaskLayoutConstraint:0x1c5eb9e0 h=-&- v=-&- UINavigationTransitionView:0x1c5d2b20.height == UILayoutContainerView:0x1c5d1440.height>",
"<NSAutoresizingMaskLayoutConstraint:0x1c5e9f80 h=-&- v=-&- UIViewControllerWrapperView:0x1d0ba580.height == UINavigationTransitionView:0x1c5d2b20.height>",
"<NSAutoresizingMaskLayoutConstraint:0x1c5e8610 h=-&- v=-&- UILayoutContainerView:0x1d096c30.height == UIViewControllerWrapperView:0x1d0ba580.height>",
"<NSAutoresizingMaskLayoutConstraint:0x1c5e6ed0 h=-&- v=-&- UITransitionView:0x1d0999d0.height == UILayoutContainerView:0x1d096c30.height - 49>",
"<NSAutoresizingMaskLayoutConstraint:0x1c5e5980 h=-&- v=-&- UIViewControllerWrapperView:0x1c5cb7a0.height == UITransitionView:0x1d0999d0.height - 20>",
"<NSAutoresizingMaskLayoutConstraint:0x1d0c0710 h=--& v=--& UITableView:0x1db44600.midY ==>",
"<NSAutoresizingMaskLayoutConstraint:0x1c5e4270 h=-&- v=-&- UIView:0x1c596de0.height == UIViewControllerWrapperView:0x1c5cb7a0.height>",
"<NSAutoresizingMaskLayoutConstraint:0x1d0c0750 h=--& v=--& V:[UITableView:0x1db44600(0)]>"
)
Will attempt to recover by breaking constraint
<NSLayoutConstraint:0x1c5ab510 V:[UITableView:0x1db44600]-(0)-| (Names: '|':UIView:0x1c596de0 )>
感谢您阅读整个（巨大的）帖子！希望有人知道为什么它不起作用！