Question

当我尝试通过自动布局添加所有视图时，它会显示以下消息：

CRASH Unable to install constraint on view. 
Does the constraint reference something from outside the subtree of the view?  
That's illegal. 
constraint:<NSLayoutConstraint:0x756b510 UIPickerView:0x756f220.top == 
LoginView:0x75e9d30.top + 106> view:<LoginView: 0x75e9d30; 
frame = (0 15; 320 430); autoresize = RM+BM; layer = <CALayer: 0x75e9dc0>>

有人有想法吗？

Answer 1

我在选择器视图中确实遇到了同样的问题。点击输入字段打开了选择器视图，然后我在选择器视图上选择了一些并关闭它。当转到另一个视图，然后再回到pickerview时，我收到了提到的错误。我通过关闭autolayout来解决它。这可以在文件检查器上完成，只需取消选中autolayout。

Answer 2

快速提示：您必须为一个View Controller创建3个XIB

YourViewController.xib，
YourViewController-568.xib，
YourViewController〜ipad.xib

并在每个YourViewController.m中添加以下代码然后它将为不同的用户设备加载不同的视图

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
   // if(nibNameOrNil == nil){
        nibNameOrNil = @"YourViewController";

        if( [[UIDevice currentDevice] userInterfaceIdiom] == UIUserInterfaceIdiomPhone){
            if([UIScreen mainScreen].bounds.size.height > 480){

                nibNameOrNil = @"YourViewController-568";
                // iphone5+
            }else{
                // older than iphone5
            }
        }
   // }

    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
    if (self){

    }
    return self;
}

IOS6界面构建器自动布局：CRASH无法在视图上安装约束

2 个答案: