iOS 改变方向的高度

Question

我在我的 loadView 方法中有这个条件 float ，它适用于两个设备。然而，我在尝试找到一种方法来改变方向时遇到了最糟糕的情况。

我的 Prefix.pch 中有这个:

#define dDeviceOrientation [[UIDevice currentDevice] orientation]
#define isPortrait  UIDeviceOrientationIsPortrait(dDeviceOrientation)
#define isLandscape UIDeviceOrientationIsLandscape(dDeviceOrientation)
#define isFaceUp    dDeviceOrientation == UIDeviceOrientationFaceUp   ? YES : NO
#define isFaceDown  dDeviceOrientation == UIDeviceOrientationFaceDown ? YES : NO

我在我的 loadView 方法中有这个(纵向因为我想知道它首先起作用......:

CGRect screenBounds = [[UIScreen mainScreen] bounds];
CGFloat screenHeight = CGRectGetHeight(screenBounds);     
     float Y;
if ((UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad)){        
    NSLog(@"%f", screenHeight);
    if (isPortrait){
 Y = (screenHeight-(0.14*screenHeight));
    }else{ 
    }
} else {
    if (isPortrait){
        Y = (screenHeight-(0.25*screenHeight));
    }else{            
    }
}
settingsButton.frame = CGRectMake(20, Y, 40, 40.0);
aboutButton.frame = CGRectMake(75, Y, 40, 40.0);

有很多解决方案，但我不是那么敏锐。

=====

Matt Neuburg 引导我考虑 NSLayoutConstraint...这就是我收集的内容:

[self.view addSubview:ab];
[self.view addSubview:sb];
//constraints
NSLayoutConstraint *constraint =[NSLayoutConstraint
                                  constraintWithItem:ab
                                //ab's relation to the left edge
                                  attribute:NSLayoutAttributeLeading                                      
                                  relatedBy:NSLayoutRelationEqual
                                  toItem:self.view
                                  attribute:NSLayoutAttributeLeading                                      
                                  multiplier:1.0f
                                  constant:7.f];
[self.view addConstraint:constraint];

constraint = [NSLayoutConstraint
              constraintWithItem:ab
              //ab's relation to the bottom edge
              attribute:NSLayoutAttributeBottom
              relatedBy:NSLayoutRelationEqual
              toItem:self.view
              attribute:NSLayoutAttributeBottom
              multiplier:1.0f
              constant:-10.f];

[self.view addConstraint:constraint];

constraint = [NSLayoutConstraint constraintWithItem:sb
            //sb's identical relation to the bottom edge ( violation of DRY but I'm in a hurry :'( //
              attribute:NSLayoutAttributeBottom
              relatedBy:NSLayoutRelationEqual
              toItem:self.view attribute:NSLayoutAttributeBottom
              multiplier:1.0f constant:-10.f];
[self.view addConstraint:constraint];

constraint = [NSLayoutConstraint
              //SB's relation to the leading edge
              constraintWithItem:sb
              attribute:NSLayoutAttributeLeading
              relatedBy:NSLayoutRelationEqual
              toItem:self.view
              attribute:NSLayoutAttributeLeading
              multiplier:1.0f
              constant:75.0f];
[self.view addConstraint:constraint];

这是结果:

Answer 1

正如其他人所暗示的，问题是 viewDidLoad 太早了。我在我的书中给出了一堆解决方案:

http://www.apeth.com/iOSBook/ch19.html#SECrotationevents

viewDidLayoutSubviews 是一个极好的地方。 iOS 6 中最好的一点就是给所有的东西都很好的约束，然后你根本不需要任何关于旋转的代码。