UIImageView方面适合高度

Question

我需要根据高度设置UIImageView大小aspectfit。

意味着我的要求是我的图像高度应该被修复，但图像的宽度应该根据高度改变我知道在UIViewContentModeScaleAspectFit中它会自动采取宽度和高度但是如果我需要修复高度和动态宽度如aspectfit根据身高。

Answer 1

UIImage *originalImage = [UIImage imageNamed:@"image.png"];
double width = originalImage.size.width;
double height = originalImage.size.height;
double apect = width/height;

double nWidth = 320.f/ apect;
self.img.frame = CGRectMake(0, 0, nWidth, 320.f);
self.img.center = self.view.center;
self.img.image = originalImage;

Answer 2

-(CGSize)resizeImage:(CGSize)imageSize toTargetedHeight:(float)height {

 NSLog(@"actualImageSize : %@", NSStringFromCGSize(imageSize));

 float scaleFactor = height / imageSize.height;
 float newHeight = imageSize.height * scaleFactor;
 float newWidth = imageSize.width  * scaleFactor;

 CGSize newSize = CGSizeMake(newWidth, newHeight);

 NSLog(@"convertedImageSize : %@", NSStringFromCGSize(newSize));
 return newSize;

}

这将创建具有特定高度的图像并保持其纵横比。