iOS为什么设置NSBaselineOffsetAttributeName时NSTextAttachment会消失? [英] iOS Why do NSTextAttachment disappear when setting NSBaselineOffsetAttributeName?
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问题描述
我想对齐NSTextAttachment到文本的中心,所以我设置
NSBaselineOffsetAttributeName来改变NSTextAttachment的基线。
I want to align the NSTextAttachment to the center of the text, so I set NSBaselineOffsetAttributeName to change the baseline of NSTextAttachment.
NSMutableAttributedString *attrString = [[NSMutableAttributedString alloc] initWithString:@"" attributes:@{NSFontAttributeName: [UIFont fontWithName:@"STHeitiSC-Light" size:17]}];
NSTextAttachment *attachment = [[NSTextAttachment alloc] init];
attachment.image = [UIImage imageNamed:@"micon"];
NSMutableAttributedString *ats = [[NSAttributedString attributedStringWithAttachment:attachment] mutableCopy];
[ats addAttributes:@{NSBaselineOffsetAttributeName:@(-5),NSFontAttributeName: [UIFont fontWithName:@"STHeitiSC-Light" size:17]} range:(NSRange){0,ats.length}];
[attrString appendAttributedString:s];
然后我计算UILabel的大小并设置attributedText。
Then I calculate the size for UILabel and set attributedText.
CGRect textFrame = [attrString boundingRectWithSize:size options:NSStringDrawingUsesLineFragmentOrigin|NSStringDrawingUsesFontLeading context:nil];
UILabel *label = [[UILabel alloc] initWithFrame:textFrame];
label.lineBreakMode = NSLineBreakByCharWrapping;
label.numberOfLines = 0;
label.attributedText = attributed;
label.backgroundColor = [UIColor clearColor];
最后一张图片消失了。
任何人都可以解释为什么会这样,如何修复它。
Can anyone explain why this is happening and how to fix it.
推荐答案
我最后通过添加另一个属性来解决它 NSParagraphStyleAttributeName
I finally solve it by adding another attribute NSParagraphStyleAttributeName
NSMutableParagraphStyle *paragraphStyle = [[NSMutableParagraphStyle alloc] init];
paragraphStyle.minimumLineHeight = lineheight; //line height equals to image height
[attributes setValue:paragraphStyle forKey:NSParagraphStyleAttributeName];
不要改变图像的偏移量,只需设置文本的偏移量。
don't change the image's offset, just set the text's offset.
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