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iOS: implement extended scale type (fit start & fit end)

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王劲鹏 2023-09-13 14:34:17 +08:00 committed by osborn
parent 3c736ace0e
commit 638f942738
1 changed files with 85 additions and 0 deletions
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85
doric-iOS/Pod/Classes/Shader/DoricImageNode.m
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@ -50,6 +50,31 @@ - (void)displayLayer:(CALayer *)layer {
[super displayLayer:layer];
}
}
- (void)layoutSubviews {
[super layoutSubviews];
if (self.contentMode == UIViewContentModeTopLeft || self.contentMode == UIViewContentModeBottomRight) {
UIImage *image = self.image;
if (!image) { return; }
CGSize viewSize = self.bounds.size;
CGSize imageSize = image.size;
// Calculate the scale proportionally to fit the image within the view.
CGFloat scale = MIN(viewSize.width / imageSize.width, viewSize.height / imageSize.height);
// Resize the image using the calculated scale factor.
CGSize newImageSize = CGSizeMake(imageSize.width * scale, imageSize.height * scale);
UIGraphicsBeginImageContextWithOptions(newImageSize, NO, 0.0);
[image drawInRect:CGRectMake(0, 0, newImageSize.width, newImageSize.height)];
UIImage *scaledImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
// Set the new scaled image and use UIViewContentModeTopLeft content mode.
self.image = scaledImage;
}
}
@end
#elif DORIC_USE_SDWEBIMAGE
@ -60,6 +85,32 @@ @interface DoricImageView : SDAnimatedImageView
@end
@implementation DoricImageView
- (void)layoutSubviews {
[super layoutSubviews];
if (self.contentMode == UIViewContentModeTopLeft || self.contentMode == UIViewContentModeBottomRight) {
UIImage *image = self.image;
if (!image) { return; }
CGSize viewSize = self.bounds.size;
CGSize imageSize = image.size;
// Calculate the scale proportionally to fit the image within the view.
CGFloat scale = MIN(viewSize.width / imageSize.width, viewSize.height / imageSize.height);
// Resize the image using the calculated scale factor.
CGSize newImageSize = CGSizeMake(imageSize.width * scale, imageSize.height * scale);
UIGraphicsBeginImageContextWithOptions(newImageSize, NO, 0.0);
[image drawInRect:CGRectMake(0, 0, newImageSize.width, newImageSize.height)];
UIImage *scaledImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
// Set the new scaled image and use UIViewContentModeTopLeft content mode.
self.image = scaledImage;
}
}
@end
#else
@ -67,6 +118,32 @@ @interface DoricImageView : UIImageView
@end
@implementation DoricImageView
- (void)layoutSubviews {
[super layoutSubviews];
if (self.contentMode == UIViewContentModeTopLeft || self.contentMode == UIViewContentModeBottomRight) {
UIImage *image = self.image;
if (!image) { return; }
CGSize viewSize = self.bounds.size;
CGSize imageSize = image.size;
// Calculate the scale proportionally to fit the image within the view.
CGFloat scale = MIN(viewSize.width / imageSize.width, viewSize.height / imageSize.height);
// Resize the image using the calculated scale factor.
CGSize newImageSize = CGSizeMake(imageSize.width * scale, imageSize.height * scale);
UIGraphicsBeginImageContextWithOptions(newImageSize, NO, 0.0);
[image drawInRect:CGRectMake(0, 0, newImageSize.width, newImageSize.height)];
UIImage *scaledImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
// Set the new scaled image and use UIViewContentModeTopLeft content mode.
self.image = scaledImage;
}
}
@end
#endif
@ -718,6 +795,14 @@ - (void)updateScaleType {
self.view.contentMode = UIViewContentModeScaleToFill;
break;
}
case 4: {
self.view.contentMode = UIViewContentModeTopLeft;
break;
}
case 5: {
self.view.contentMode = UIViewContentModeBottomRight;
break;
}
default: {
self.view.contentMode = UIViewContentModeScaleToFill;
break;