ios - 如何获取uiimage的高度和宽度？

Question

来自邮件中的 URL图像

我正在将图像添加到邮件视图。它将显示完整图像。但我想计算，按比例改变图像的高度和宽度。

我怎样才能得到的高度和宽度UIImage？

Answer 1

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

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

Answer 2

Use the size property on the UIImage instance. See the documentation for more details.

Answer 3

UIImage *img = [UIImage imageNamed:@"logo.png"];

CGFloat width = img.size.width;
CGFloat height = img.size.height;

Answer 4

上面的一些答案，在旋转设备时不能很好地工作。

尝试：

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

Answer 5

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) ;

Answer 6

有很多有用的解决方案，但没有简化的扩展方法。这是解决扩展问题的代码：

extension UIImage {

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

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

Answer 7

    import func AVFoundation.AVMakeRect

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

    x = imageRect.minX

    y = imageRect.minY

Answer 8

let imageView: UIImageView = //this is your existing imageView

let imageViewHeight: CGFloat = imageView.frame.height

let imageViewWidth: CGFloat = imageView.frame.width