如何在UIGraphicsImageRenderer上使用UIGraphicsRendererFormat？

Question

我需要为我的UIGraphicsImageRenderer使用UIGraphicsRendererFormat来改变它的比例，但是我在网上找不到一个例子。这是我的代码，感谢大家的帮助：

//Based on documentation I know that I have to create an instance from
UIGraphicsImageRendererFormat and set its scale to my desired scale but how can I use it???

UIGraphicsImageRendererFormat * format = [UIGraphicsImageRendererFormat defaultFormat];
format.scale=1.0;
UIGraphicsImageRenderer*renderer = [[UIGraphicsImageRenderer alloc]initWithBounds:self.bgImageView.layer.bounds];

UIImage*image= [renderer imageWithActions:^(UIGraphicsImageRendererContext*_Nonnull myContext){
        [self.bgImageView.layer renderInContext: myContext.CGContext];
}];

文档：https://developer.apple.com/documentation/uikit/uigraphicsrendererformat?language=objc

Answer 1

使用此API可能会解决您的问题：

   UIGraphicsImageRendererFormat * format = [UIGraphicsImageRendererFormat defaultFormat];
   format.scale=1.0;
   UIGraphicsImageRenderer *renderer = [[UIGraphicsImageRenderer alloc] initWithSize:CGSizeMake(200, 200) format: format];

See this doc