iPhone - 我怎样才能得到高度的UIImage

Question

的宽度从URL Image in Mail

我将图片添加到邮件视图。它会显示完整的图像。但我想计算，按比例改变图像的高度和宽度。

如何获得UIImage的高度和宽度？

Answer 1

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

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

Answer 2

在UIImage实例上使用size属性。有关更多详细信息，请参阅the documentation。

Answer 3

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 4

以上所述的部分anwsers的，旋转设备时不能很好工作。

尝试：

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

Answer 5

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

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

Answer 6

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

let imageViewHeight: CGFloat = imageView.frame.height 

let imageViewWidth: CGFloat = imageView.frame.width