iPhone - 我怎樣才能得到高度的UIImage

Question

的寬度從URL Image in Mail

我將圖片添加到郵件視圖。它會顯示完整的圖像。但我想計算，按比例改變圖像的高度和寬度。

如何獲得UIImage的高度和寬度？

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實例上使用size屬性。有關更多詳細信息，請參閱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，旋轉設備時不能很好工作。

嘗試：

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