在iOS 13中在图像上绘制文本？
我正在尝试在UISlider缩略图上绘制图像和一些文本。我有以下代码在iOS 12及以下版本上正常运行，但在iOS 13及以上版本（特别是iOS 13.2）上无效。
CGFloat scale = 5.0;
//Drawing BG Image
// Where bg image is some image on top of which i need to render text.
UIGraphicsBeginImageContextWithOptions(CGSizeMake(bgImage.size.width * scale, bgImage.size.height * scale), NO, 1);
// This works
[bgImage drawInRect:CGRectMake(0, 0, bgImage.size.width * scale, bgImage.size.height * scale)];
CGRect valueBgRect;
UIColor * textColor;
UIFont * textFont;
textColor = [UIColor whiteColor];
valueBgRect = CGRectMake(18,40, bgImage.size.width,bgImage.size.height);
textFont = [UIFont fontWithName:@"Helvetica-Bold" size:50];
NSDictionary *attrsValue = @{ NSForegroundColorAttributeName : textColor,
NSFontAttributeName : textFont,
NSTextEffectAttributeName : NSTextEffectLetterpressStyle};
// This doesn't.
[value drawInRect:valueBgRect withAttributes:attrsValue];
// Though I can see the image, the text that should be on top of it is not visible.
UIImage *theImage=UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return theImage; }
我也尝试在UILabel上设置文本并使用
和```[self.view drawViewHierarchyInRect:self.view.bounds afterScreenUpdates:YES];
但是都没有作用。
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在IOS 13 上工作：```_imgView.image = [self drawFront:[UIImage imageNamed:@"chain_image.jpeg"] text:@"SANKET VAGHELA" atPoint:CGPointMake(50, 50)];
打开function``` -(UIImage*)drawFront:(UIImage*)image text:(NSString*)text atPoint: (CGPoint)point { UIFont *font = [UIFont systemFontOfSize:20]; UIGraphicsBeginImageContext(image.size); [image drawInRect:CGRectMake(0,0,image.size.width,image.size.height)]; CGRect rect = CGRectMake(point.x, (point.y - 5), image.size.width, image.size.height); [[UIColor whiteColor] set]; NSMutableAttributedString* attString = [[NSMutableAttributedString alloc] initWithString:text]; NSRange range = NSMakeRange(0, [attString length]); [attString addAttribute:NSFontAttributeName value:font range:range]; [attString addAttribute:NSForegroundColorAttributeName value:[UIColor whiteColor] range:range]; NSShadow* shadow = [[NSShadow alloc] init]; shadow.shadowColor = [UIColor darkGrayColor]; shadow.shadowOffset = CGSizeMake(1.0f, 1.5f); [attString addAttribute:NSShadowAttributeName value:shadow range:range]; [attString drawInRect:CGRectIntegral(rect)]; UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext(); UIGraphicsEndImageContext(); return newImage; }2019-12-03 21:17:58赞同 展开评论 打赏
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