根据iPhone方向旋转UIImageView [英] Rotate UIImageView Depending on iPhone Orientation

问题描述

我如何做到这一点，我想做的只是旋转一个 UIImageView 取决于iPhone的方向。

How would I do this, all I want to do is rotate a UIImageView depending on the orientation of the iPhone.

推荐答案

您可以通过IB，通过纵向和横向布局获得应用程序，或者您可以通过编程方式。

You can do this through IB, to get an app with a portrait and a landscape layout, or you can do it programmatically. This is about the programmatic way.

要获得更改方向的通知，请使用

To get notifications on the change of orientation, use

[[UIDevice currentDevice] beginGeneratingDeviceOrientationNotifications];
[[NSNotificationCenter defaultCenter] addObserver:self
                selector:@selector(orientationChanged)
                name:UIDeviceOrientationDidChangeNotification
                object:nil];

并添加一个这样的函数（注意这是一个项目复制的， ，您需要根据您的具体情况调整转换）

and add a function like this (note this is copypasted from a project and a lot of lines are left out, you will need to tune the transformation to your specific situation)

-(void)orientationChanged
{
    UIDeviceOrientation o = [UIDevice currentDevice].orientation;

    CGFloat angle = 0;
    if ( o == UIDeviceOrientationLandscapeLeft ) angle = M_PI_2;
    else if ( o == UIDeviceOrientationLandscapeRight ) angle = -M_PI_2;
    else if ( o == UIDeviceOrientationPortraitUpsideDown ) angle = M_PI;

    [UIView beginAnimations:@"rotate" context:nil];
    [UIView setAnimationDuration:0.7];
    self.rotateView.transform = CGAffineTransformRotate(
                                CGAffineTransformMakeTranslation(
                                    160.0f-self.rotateView.center.x,
                                    240.0f-self.rotateView.center.y
                                ),angle);
    [UIView commitAnimations];
}

完成后，停止通知：

[[UIDevice currentDevice] endGeneratingDeviceOrientationNotifications];
[[NSNotificationCenter defaultCenter] removeObserver:self];

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