imageview和图像纵横比的区别

我在UIView上添加了一个Imageview，并设置了属性AspectToFit。根据应用程序的要求，我需要在imageview上添加一个图像。imageview和图像纵横比的区别

float width; 
    float height; 
    float x; 
    float y; 

    CGSize imageViewSize = self.getImageView.bounds.size;// self.getImageView.frame.size; 
    CGSize imageSize = self.getImage.size; 
    CGFloat minFactor = imageViewSize.width/imageSize.width; 
    if (imageViewSize.height/imageSize.height < minFactor) 
    { 
     minFactor = imageViewSize.height/imageSize.height; 
    } 
    CGRect frame = self.getImageView.frame; 
    NSLog(@"view height..%@",NSStringFromCGRect (frame)); 
    CGSize resultSize = CGSizeMake(minFactor * imageSize.width, minFactor * imageSize.height); 
    UIImage *newimage = [self imageWithImage:self.getImage scaledToSize:resultSize]; 
    float mainwidth = imageViewSize.width; 
    float mainheight = imageViewSize.height; 

    float imagewidth = newimage.size.width; 
    float imageheight = newimage.size.height; 

    _widthdiff = mainwidth-imagewidth; 
    _heightdiff = mainheight-imageheight; 

    x = self.view.frame.size.width-width-0-_widthdiff/2; 
    y = self.view.frame.size.height-height-116-_heightdiff/2; 

imageview = [[UIImageView alloc] 
       initWithFrame:CGRectMake(x, y, width, height)]; 
    [imageview setContentMode:UIViewContentModeScaleAspectFit];

该代码可用于除iPhone（iPhone 6另外，IPONE 7加）的所有设备工作正常。正如我所看到的，只有在Plus设备的大小上才有问题。

有没有什么不同来计算imageview和正确的图像之间的差异或比例？请指教。

请参见附件图像

来源

2017-04-10 Minkle Garg

目前尚不清楚您面临的具体问题。 – Shubhank

@Shubhank我编辑了我的问题，附上两张图片，一张是iPhone 5s，另一张是iPhone 6s Plus。你可以看到，qrcode的图像位置是精确的，因为每个uiimage开始在uiimageview方面适合后，但在iPhone 6s Plus中，qrcode的位置不正确。 –

分配了“宽度”和“高度”的值？ – Shubhank

我们可以通过计算旧图像的尺寸增加新的图像，然后将其添加到UIView的按要求。

CGSize imageViewSize = self.getImageView.frame.size; 
    CGSize imageSize = self.getImage.size; 
    CGFloat minFactor = imageViewSize.width/imageSize.width; 
    if (imageViewSize.height/imageSize.height < minFactor) 
    { 
     minFactor = imageViewSize.height/imageSize.height; 
    } 
    CGSize resultSize = CGSizeMake(minFactor * imageSize.width, minFactor * imageSize.height); 

    UIImage *newimage = [self imageWithImage:self.getImage scaledToSize:resultSize]; 
self.duplicateimageview = [[UIImageView alloc] 
            initWithFrame:CGRectMake(self.view.frame.size.width/2-newimage.size.width/2, self.view.frame.size.height/2-newimage.size.height/2, newimage.size.width, newimage.size.height)]; 
     [self.view addSubview:self.duplicateimageview]; 
     self.duplicateimageview.image = newimage;  

- (UIImage*)imageWithImage:(UIImage*)image 
       scaledToSize:(CGSize)newSize; 
{ 
    UIGraphicsBeginImageContext(newSize); 
    [image drawInRect:CGRectMake(0,0,newSize.width,newSize.height)]; 
    UIImage* newImage = UIGraphicsGetImageFromCurrentImageContext(); 
    UIGraphicsEndImageContext(); 
    return newImage; 
}

来源

2017-05-04 05:40:45

imageview和图像纵横比的区别

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