[iOS] UIImageView is blurred when displaying enlarged images

If you want to zoom in without blurring, you need to change an attribute

    UIImageView *imageView = [[UIImageView alloc] init];
    CALayer *layer = imageView.layer;
    layer.magnificationFilter = @"nearest";
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The magnificationFilter attribute is explained below in the documentation

Among them

typedef NSString * CALayerContentsFilter NS_STRING_ENUM;
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So the magnificationFilter is an NSString attribute whose value is given in the document as @”nearest” or @” Linear “.

layer.magnificationFilter = @"nearest";
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The effect of setting this property