ios - 从 iOS 10.3 开始 : UIButton ignoring negative paragraph lineSpacing in NSAttributedString

Question

我有一个 UIButton，它实际上只有 2 个单词，分为 2 行(稍后我在代码中将行值设置为“2”)。我一直在通过为段落 lineSpacing 设置负值来收紧默认 lineSpacing(如下图所示)。

从 iOS 10.3 开始，负值似乎被忽略了。虽然我可以用正值增加 lineSpacing，但我不能再收紧 2 行了。

还有其他人知道如何在 UIButton 中加强这一点吗？ (我准备好改变那个控制......但我想我会发布这个问题)。

非常感谢大家。

NSMutableParagraphStyle *paragraphStyle = [[NSMutableParagraphStyle alloc] init];
paragraphStyle.lineSpacing = -15.0f;
paragraphStyle.alignment = NSTextAlignmentLeft;

NSDictionary * attributes = [NSDictionary dictionaryWithObjectsAndKeys:
                             [UIColor whiteColor], NSStrokeColorAttributeName,
                             [UIColor greenColor], NSForegroundColorAttributeName,
                             @(-2.0), NSStrokeWidthAttributeName,
                             paragraphStyle, NSParagraphStyleAttributeName,
                             nil];
NSMutableAttributedString *buttonTitle = [[NSMutableAttributedString alloc] initWithString:str attributes:attributes];

self.theButton.titleLabel.numberOfLines = 2;
[self.theButton setAttributedTitle:buttonTitle forState:UIControlStateNormal];

编辑:看起来这也是 UILabel 的问题。

Answer 1

我可以使用 iOS 10.2 中的代码更改行距

NSMutableParagraphStyle *paraStyle = [NSMutableParagraphStyle defaultParagraphStyle].mutableCopy;
paraStyle.alignment = NSTextAlignmentCenter;
paraStyle.lineBreakMode = NSLineBreakByCharWrapping;
paraStyle.paragraphSpacing = -8;

[self setAttributedTitle:[[NSAttributedString alloc] initWithString:[NSString stringWithFormat:@"test button\n normal", titleString] attributes:@{NSParagraphStyleAttributeName:paraStyle}] forState:UIControlStateNormal];
[self setAttributedTitle:[[NSAttributedString alloc] initWithString:[NSString stringWithFormat:@"test button\n selected", titleString] attributes:@{NSParagraphStyleAttributeName:paraStyle}] forState:UIControlStateSelected];

我想也许你可以改变 paragraphSpacing，它有效~