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我使用 CGAffineTransformMakeRotation 旋转了一个视图。（iPhone - 只允许在一个视图控制器上横向显示）

正如您在下面看到的，图像的左侧和右侧都有白色区域。
我希望图像占据黑色背景的整个空间。（至少在一维，宽度或高度）

在此处输入图像描述

以下是完整代码

- (void) viewDidLoad
{
    [super viewDidLoad];

    self.view.autoresizingMask = UIViewAutoresizingFlexibleHeight | UIViewAutoresizingFlexibleWidth;
    self.view.backgroundColor = [UIColor blackColor];

    self.imageView.backgroundColor = [UIColor blackColor];
    self.imageView.opaque = NO;
    self.imageView.contentMode = UIViewContentModeScaleAspectFit;
    self.imageView.autoresizingMask = UIViewAutoresizingFlexibleHeight | UIViewAutoresizingFlexibleWidth |
        UIViewAutoresizingFlexibleLeftMargin | UIViewAutoresizingFlexibleRightMargin | UIViewAutoresizingFlexibleTopMargin | UIViewAutoresizingFlexibleBottomMargin;

    [self.imageView setImageWithURL:[NSURL URLWithString:self.jsonAlbumImage.url_image
                                           relativeToURL: [NSURL URLWithString:@URL_BASE]]
                   placeholderImage: [GlobalHelper placeHolderImage]];

    [self.view addSubview: self.imageView];

}

- (void)didRotate:(NSNotification *)notification {
    UIDeviceOrientation orientation = [[notification object] orientation];

    if (orientation == UIDeviceOrientationLandscapeLeft) {
        [self.view setTransform:CGAffineTransformMakeRotation(M_PI / 2.0)];
    } else if (orientation == UIDeviceOrientationLandscapeRight) {
        [self.view setTransform:CGAffineTransformMakeRotation(M_PI / -2.0)];
    } else if (orientation == UIDeviceOrientationPortraitUpsideDown) {
        [self.view setTransform:CGAffineTransformMakeRotation(M_PI)];
    } else if (orientation == UIDeviceOrientationPortrait) {
        [self.view setTransform:CGAffineTransformMakeRotation(0.0)];
    }
}

- 编辑 -

最终对我有用的东西..不知道为什么修改有效..任何解释都会很棒！

  UIDeviceOrientation orientation = [[notification object] orientation];

    CGAffineTransform t;
    CGRect rect;
    if (orientation == UIDeviceOrientationLandscapeLeft) {
        t = CGAffineTransformMakeRotation(M_PI / 2.0);
        rect = CGRectMake(0,0,480,320);
    } else if (orientation == UIDeviceOrientationLandscapeRight) {
        t = CGAffineTransformMakeRotation(M_PI / -2.0);
        rect = CGRectMake(0,0,480,320);
    } else if (orientation == UIDeviceOrientationPortraitUpsideDown) {
        t = CGAffineTransformMakeRotation(M_PI);
        rect = CGRectMake(0,0,320,480);
    } else if (orientation == UIDeviceOrientationPortrait) {
        t = CGAffineTransformMakeRotation(0.0);
        rect = CGRectMake(0,0,320,480);
    }
    else
        return; // looks like there are other orientations than the specified 4

    [self.view setTransform:t];
    self.view.bounds = rect;
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1 回答 1

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在- (void)didRotate:(NSNotification *)notification中，您需要重新布局视图，以便它们占据所有可用空间。你可以这样做：

- (void)didRotate:(NSNotification *)notification {
  UIDeviceOrientation orientation = [[notification object] orientation];

  CGAffineTransform t;
  if (orientation == UIDeviceOrientationLandscapeLeft) {
    t = CGAffineTransformMakeRotation(M_PI / 2.0);
  } else if (orientation == UIDeviceOrientationLandscapeRight) {
    t = CGAffineTransformMakeRotation(M_PI / -2.0);
  } else if (orientation == UIDeviceOrientationPortraitUpsideDown) {
    t = CGAffineTransformMakeRotation(M_PI);
  } else if (orientation == UIDeviceOrientationPortrait) {
    t = CGAffineTransformMakeRotation(0.0);
  }

  CGPoint screenCenter = CGPointMake([UIScreen mainScreen].bounds.width/2,[UIScreen mainScreen].bounds.height/2);
  self.view.center = CGPointApplyAffineTransform(screenCenter, t);
  self.view.bounds = CGRectApplyAffineTransform([UIScreen mainScreen].bounds, t);
  [self.view setTransform:t];

}

在哪里 ：

CGRectApplyAffineTransform

将仿射变换应用于矩形。

       CGRect CGRectApplyAffineTransform (
           CGRect rect,
           CGAffineTransform t
         );

也尝试删除这一行：

self.view.autoresizingMask = UIViewAutoresizingFlexibleHeight | UIViewAutoresizingFlexibleWidth;

如果您不打算使用自动旋转，则不需要它，我担心它可能会与您自己设置视图框架发生冲突。这只是一个假设，以解释您没有看到视图框架变化的事实。

编辑：

我很想知道这个转换的东西是做什么的

好吧，变换正在旋转。

旋转相对于用作枢轴的锚点；发生的情况是，如果锚点不在正在旋转的视图的中间，那么视图也会被平移（想象一下围绕顶点的旋转）。

因此，设置界限以使事情变得均匀是正确的；确实，我只是在建议以下几行：

  self.view.center = CGPointApplyAffineTransform(screenCenter, t);
  self.view.bounds = CGRectApplyAffineTransform([UIScreen mainScreen].bounds, t);

但可能对中心和边界应用相同的变换的想法并没有得到祝福。（这也是为什么我要求一些痕迹，看看发生了什么:-)

于 2013-01-15T09:01:37.297 回答