Question

有一个令人困惑的问题：

我有一个视图控制器（settingsViewVontroller)，它提供了另一个嵌入在导航控制器中的VC（colorPickerController）。在iPhone上，settingsViewController以模态方式呈现。在iPad上，它以弹出窗口呈现在这两种情况下，导航控制器都以模态方式呈现，以覆盖设置ViewController - iPhone上的全屏，以及iPad上封闭的弹出窗口。

在ios7的两种情况下均可正常工作，但在ios6 for iPad上，它会尝试以模态方式显示包含颜色选择器的导航控制器。我收到一个自动布局错误，说无法协调约束，这似乎是导航栏的问题......

为什么这会在ios7上运行而不是6？

更新：部分代码：

从弹出窗口中，以模态方式呈现颜色选择器：

ColorPickerViewController *cpcontroller = [[ColorPickerViewController alloc] init];
    cpcontroller.delegate = self;
    cpcontroller.selectedColor = self.frameColorButton.backgroundColor;
    cpcontroller.title = @"Frame Color";
    UINavigationController* navVC = [[UINavigationController alloc] initWithRootViewController:cpcontroller];
    navVC.delegate = self;

    if (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad) {
        navVC.modalPresentationStyle = UIModalPresentationCurrentContext;
        //navVC.contentSizeForViewInPopover = CGSizeMake(320, 568);
        //controller.contentSizeForViewInPopover = CGSizeMake(320,568);
        //controller.view.translatesAutoresizingMaskIntoConstraints = NO;
    }

    [self presentViewController:navVC animated:YES completion:nil];

三条注释掉的线：我已经测试了每个“开”或“关”，没有变化。

以下是错误的文字：

2014-08-09 09:30:28.248 appname[16865:907] 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:0xa73dc70 H:[UINavigationBar:0xa992cb0]-(0)-|   (Names: '|':UIView:0xa6db840 )>",
    "<NSLayoutConstraint:0xa73dc30 H:|-(0)-[UINavigationBar:0xa992cb0]   (Names: '|':UIView:0xa6db840 )>",
    "<NSLayoutConstraint:0xa73fbd0 H:[UINavigationBar:0xa992cb0(320)]>",
    "<NSAutoresizingMaskLayoutConstraint:0xa6dcfe0 h=--& v=--& UILayoutContainerView:0xa711050.width == UIView:0xa711370.width + 320>",
    "<NSAutoresizingMaskLayoutConstraint:0xa6f5d40 h=-&- v=-&- UIView:0xa6db840.width == UILayoutContainerView:0xa711050.width>",
    "<NSAutoresizingMaskLayoutConstraint:0xa6f86d0 h=--& v=--& H:[UIView:0xa711370(320)]>"
)

Will attempt to recover by breaking constraint 
<NSLayoutConstraint:0xa73fbd0 H:[UINavigationBar:0xa992cb0(320)]>

Break on objc_exception_throw to catch this in the debugger.

在ios6上使用popover时出现崩溃

0 个答案: