为什么当我显示视图控制器时它不能在景观中工作？答案

【问题标题】：Why doesn't work a view controller at landscape when I show it?为什么当我显示视图控制器时它不能在景观中工作？
【发布时间】：2014-10-11 01:26:09
【问题描述】：

我通过这段代码在主屏幕上添加 UIViewController ：

SettingViewController *v=[ self.storyboard instantiateViewControllerWithIdentifier: @"SettingViewController"];

[self addChildViewController:v];
[self.view addSubview:v.view];
[v didMoveToParentViewController:self];

我的问题：呈现的视图在横向上不起作用！！为什么？？

【问题讨论】：

标签： ios7 xcode5 autolayout uistoryboard landscape-portrait

【解决方案1】：

您可以在视图控制器（settingVC）上以编程方式添加约束：

// To Pure Auto Layout Approach
settingVC.view.translatesAutoresizingMaskIntoConstraints=NO;

// Add Constraints 
NSLayoutConstraint *leftConstraint = [NSLayoutConstraint constraintWithItem:settingVC.view  attribute:NSLayoutAttributeLeading
                                                                                  relatedBy:0
                                                                                     toItem:self.view
                                                                                  attribute:NSLayoutAttributeLeft
                                                                                 multiplier:1.0
                                                                                   constant:0];
[self.view addConstraint:leftConstraint];

NSLayoutConstraint *rightConstraint = [NSLayoutConstraint constraintWithItem:settingVC.view
                                                                                   attribute:NSLayoutAttributeTrailing
                                                                                   relatedBy:0
                                                                                      toItem:self.view
                                                                                   attribute:NSLayoutAttributeRight
                                                                                  multiplier:1.0
                                                                                    constant:0];
[self.view addConstraint:rightConstraint];

NSLayoutConstraint *bottomConstraint = [NSLayoutConstraint constraintWithItem:v.view  attribute:NSLayoutAttributeBottom
                                                                                  relatedBy:0
                                                                                     toItem:self.view
                                                                                  attribute:NSLayoutAttributeBottom
                                                                                 multiplier:1.0
                                                                                   constant:0];
[self.view addConstraint:bottomConstraint];

                NSLayoutConstraint *topConstraint = [NSLayoutConstraint constraintWithItem:settingVC.view
                                                                                   attribute:NSLayoutAttributeTop
    relatedBy:0                                                                      attribute:NSLayoutAttributeTop
    multiplier:1.0
    constant:0];
    [self.view addConstraint:topConstraint];

【讨论】：

【解决方案2】：

我找到了一个解决方案，通过在显示之前更改 UIViewController 的框架以及更改设备的方向如下：

//Get Device Orientation.
UIInterfaceOrientation orientation = [[UIApplication sharedApplication] statusBarOrientation];

// Add ViewController 
[self addChildViewController:settingVC];
[self.view addSubview:settingVC.view];
[settingVC didMoveToParentViewController:self];

// Change ViewController's Frame.   
if (orientation == UIInterfaceOrientationLandscapeLeft || orientation == UIInterfaceOrientationLandscapeRight)
     settingVC.view.frame=CGRectMake(0, 0, GetHeightOfDevice , GetWidthOfDevice);  
else
     settingVC.view.frame=CGRectMake(0, 0, GetWidthOfDevice, GetHeightOfDevice);

【讨论】：