Question

我的loadView方法中有这个条件浮点数，这对两个设备都有效。但是，我有最糟糕的时间试图找到一种方法来改变方向。

我在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

我的loadView方法中有这个（肖像，因为我想知道它首先工作......：

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，但我不是那么尖锐。

=====

Matt Neuburg引导我考虑NSLayoutConstraint ......这就是我所集思的：

[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];

这就是结果：

enter image description here

Answer 1

正如其他人暗示的那样，问题是viewDidLoad太早了。我在书中提出了一堆解决方案：

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

viewDidLayoutSubviews是一个很棒的地方。最重要的是在iOS 6中只是给出了所有好的约束条件，然后根本不需要任何旋转代码。

Answer 2

老实说，我真的不知道你的目标是什么，但我很确定如果你将这段代码移到

- (void)viewDidLayoutSubviews

方法，你的问题将得到解决！

Answer 3

您是否尝试过使用此方法？

- (void)willRotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation duration:(NSTimeInterval)duration
{
    // Your code here
}

iOS更改高度以进行定位

3 个答案: