改变UIView的方向变化

Question

大家好.我有一个相当简单的问题.我正在开发一个"丰富"的iPad应用程序,我有两个专门为风景和肖像设计的背景图像.我希望这个ImageView根据设备方向自动更改.(就像几乎所有的苹果iPad应用程序一样).

谁能指出我正确的方向？我假设它将是我在viewDidLoad上做的事情..

Answer 1

您可以做的最好的事情是根据您的界面方向更改子视图框架的框架.你可以这样做:

 #pragma mark -
 #pragma mark InterfaceOrientationMethods

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {
    return (UIInterfaceOrientationIsPortrait(interfaceOrientation) || UIInterfaceOrientationIsLandscape(interfaceOrientation));
}

//--------------------------------------------------------------------------------------------------------------------------------------------------------------------

- (void)willRotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation duration:(NSTimeInterval)duration{
    [super willRotateToInterfaceOrientation:toInterfaceOrientation duration:duration];
    if(UIInterfaceOrientationIsPortrait(toInterfaceOrientation)){
        //self.view = portraitView;
        [self changeTheViewToPortrait:YES andDuration:duration];

    }
    else if(UIInterfaceOrientationIsLandscape(toInterfaceOrientation)){
        //self.view = landscapeView;
        [self changeTheViewToPortrait:NO andDuration:duration];
    }
}

//--------------------------------------------------------------------------------------------------------------------------------------------------------------------

- (void) changeTheViewToPortrait:(BOOL)portrait andDuration:(NSTimeInterval)duration{

    [UIView beginAnimations:nil context:NULL];
    [UIView setAnimationDuration:duration];

    if(portrait){
        //change the view and subview frames for the portrait view
    }
    else{   
        //change the view and subview  frames for the landscape view
    }

    [UIView commitAnimations];
}

希望这可以帮助.

Answer 2

我实际上想出了一个非常简单的替代方法.由于我只是更改背景图片,添加此..

`

- (void)willAnimateRotationToInterfaceOrientation:(UIInterfaceOrientation) interfaceOrientation duration:(NSTimeInterval)duration {
    if (interfaceOrientation == UIInterfaceOrientationPortrait || interfaceOrientation ==
        UIInterfaceOrientationPortraitUpsideDown) { 
        [brownBackground setImage:[UIImage imageNamed:@"Portrait_Background.png"]];
    } else {
        [brownBackground setImage:[UIImage imageNamed:@"Landscape_Background.png"]];
    }
}

`

根据方向更改声明的UIImageView的背景.唯一的缺点是,当前背景图像在"界面"构建器中不可见,因为它是使用代码处理的.

Answer 3

Madhup的方法的一小部分,这是伟大的.我发现我需要将它添加到viewDidLoad以设置纵向或横向的初始背景图像:

// set background image
if (self.interfaceOrientation == UIInterfaceOrientationPortrait || self.interfaceOrientation == UIInterfaceOrientationPortraitUpsideDown) {
    self.view.backgroundColor = [UIColor colorWithPatternImage:[UIImage imageNamed:@"portraitBG.png"]];
} else {
    self.view.backgroundColor = [UIColor colorWithPatternImage:[UIImage imageNamed:@"landscapeBG.png"]];
}

再次感谢Madhup