上面的一些答案，转动装置时工作不好。

Try:

CGRect imageContent = self.myUIImage.bounds;
CGFloat imageWidth = imageContent.size.width;
CGFloat imageHeight = imageContent.size.height;

在UIImage实例上使用size属性。有关详细信息，请参阅文档。

let heightInPoints = image.size.height
let heightInPixels = heightInPoints * image.scale

let widthInPoints = image.size.width
let widthInPixels = widthInPoints * image.scale

有很多有用的解决方案，但没有简单的扩展方法。下面是用扩展解决这个问题的代码:

extension UIImage {

    var getWidth: CGFloat {
        get {
            let width = self.size.width
            return width
        }
    }

    var getHeight: CGFloat {
        get {
            let height = self.size.height
            return height
        }
    }
}

UIImageView *imageView = [[[UIImageView alloc]initWithImage:[UIImage imageNamed:@"MyImage.png"]]autorelease];

NSLog(@"Size of my Image => %f, %f ", [[imageView image] size].width, [[imageView image] size].height) ;

    import func AVFoundation.AVMakeRect

    let imageRect = AVMakeRect(aspectRatio: self.image!.size, insideRect: self.bounds)

    x = imageRect.minX

    y = imageRect.minY