xcode iPhone，如何在拍摄时检测图像的方向
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iPhone, how to detect orientation of image when it was taken
提问by Mark McGookin
Is there any way to detect what orientation a phone was in when an image was taken?
有没有办法检测拍摄图像时手机的方向？
I have a UIImageView on a UIView and I am using an UIImagePicker to take a photo or select one from the camera roll. But if the image has been taken in landscape mode, I want to detect this and resize the imageview to stop the image from being stretched and looking stupid.
我在 UIView 上有一个 UIImageView，我正在使用 UIImagePicker 拍照或从相机胶卷中选择一张。但是如果图像是在横向模式下拍摄的，我想检测到这一点并调整图像视图的大小以阻止图像被拉伸并看起来很愚蠢。
Does anyone know if this is possible (I assume so, because the Photos app does this) and if so, how would I go about doing it in code/interface builder settings?
有谁知道这是否可行（我假设是这样，因为照片应用程序会这样做），如果是这样，我将如何在代码/界面构建器设置中进行操作？
回答by averydev
You can use myImage.imageOrientation, which will give you the UIImageOrientation,
你可以使用myImage.imageOrientation，它会给你 UIImageOrientation，
Or if for some reason you want the EXIF information directly in the "imagePickerController:didFinishPickingMediaWithInfo:" method.
或者，如果出于某种原因，您希望直接在“imagePickerController:didFinishPickingMediaWithInfo:”方法中获得 EXIF 信息。
by accessing the info dictionary [info objectForKey:@"Orientation"];
通过访问信息字典[info objectForKey:@"Orientation"];
Note: This will not relate to UIImageOrientation directly the correlation is as follows.
注意：这不会直接与 UIImageOrientation 相关，相关性如下。
- (UIImageOrientation)orientationFromEXIF:(int)exif
{
UIImageOrientation newOrientation;
switch (exif)
{
case 1:
newOrientation = UIImageOrientationUp;
break;
case 3:
newOrientation = UIImageOrientationDown;
break;
case 8:
newOrientation = UIImageOrientationLeft;
break;
case 6:
newOrientation = UIImageOrientationRight;
break;
case 2:
newOrientation = UIImageOrientationUpMirrored;
break;
case 4:
newOrientation = UIImageOrientationDownMirrored;
break;
case 5:
newOrientation = UIImageOrientationLeftMirrored;
break;
case 7:
newOrientation = UIImageOrientationRightMirrored;
break;
}
return newOrientation;
}
But you're better off using .imageOrientation
但是你最好使用 .imageOrientation
回答by pankaj kshatriya
Check this code in Swift -
在 Swift 中检查此代码 -
class func DetectOrientation(img : UIImage) -> UIImageOrientation{
var newOrientation = UIImageOrientation.Up
switch (img.imageOrientation)
{
case .Up:
newOrientation = UIImageOrientation.Up;
break;
case .Down:
newOrientation = UIImageOrientation.Down;
break;
case .Left:
newOrientation = UIImageOrientation.Left;
break;
case .Right:
newOrientation = UIImageOrientation.Right;
break;
case .UpMirrored:
newOrientation = UIImageOrientation.UpMirrored;
break;
case .DownMirrored:
newOrientation = UIImageOrientation.DownMirrored;
break;
case .LeftMirrored:
newOrientation = UIImageOrientation.LeftMirrored;
break;
case .RightMirrored:
newOrientation = UIImageOrientation.RightMirrored;
break;
}
return newOrientation;
}
回答by DavidN
Check out @property(nonatomic, readonly) UIImageOrientation imageOrientation in UIImage.
查看 UIImage 中的 @property(nonatomic, readonly) UIImageOrientation imageOrientation。
