在 Aspect Fit 上制作 UIView 的背景图像

Question

I'm working on a sort of drawing app using objective-c, and for one of my UIView s, I want there to be a background image to it. However, I want this background image on the actual UIView , not a separate UIImageView . I did that using this:

self.tempDrawImage.image = [UIImage imageNamed:@"image.jpg"];

In this code, tempDrawImage is a UIImageView I made programmatically, and after initializing it, I wrote this later in the code so that the drawings would appear on top of the image. I don't know if this is helpful, but I thought I'd include it anyway just in case it does help.

- (UIImageView *)tempDrawImage
{
    if(!_tempDrawImage) _tempDrawImage = [UIImageView new];
    return _tempDrawImage;
}

- (void)drawRect:(CGRect)rect
{
    UIGraphicsGetCurrentContext();
    [self.tempDrawImage.image drawInRect:CGRectMake(0, 0, self.frame.size.width, self.frame.size.height)];
}

Now, I'm struggling to make the image that I set to image.jpg in the beginning aspect fit. How could I do that?

Answer 1

尝试这个

self.tempDrawImage.contentMode = UIViewContentModeScaleAspectFit;

Answer 2

您可以使用UIViewContentModeScaleAspectFit

 self.tempDrawImage.contentMode = UIViewContentModeScaleAspectFit;

Answer 3

UIGraphicsBeginImageContext(view.frame.size)
UIImage(named: "YOUR-IMAGE-NAME-HERE")!.drawInRect(view.frame)
let image = UIGraphicsGetImageFromCurrentImageContext()
UIGraphicsGetCurrentContext()
view.backgroundColor = UIColor(patternImage: image)

It works for me...