英文:
using baselineOffset in NSAttributedString problem in iOS 16.4
问题
I see, after building the project on iOS 16.4, you encountered an issue with the baselineOffset that differs from iOS 16.0.
这是我的代码：
class ViewController: UIViewController {
@IBOutlet weak var label: UILabel!
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
self.label.setText("Hello World!")
}
}
extension UILabel {
func setText(_ text: String) {
let attrs = self.generateFontAttr()
self.attributedText = NSAttributedString(string: text, attributes: attrs)
}
private func generateFontAttr() -> [NSAttributedString.Key: Any] {
let paragraphStyle = NSMutableParagraphStyle()
paragraphStyle.maximumLineHeight = 120
paragraphStyle.minimumLineHeight = 120
let font = UIFont.systemFont(ofSize: 18)
let baselineOffset = 20
let attrs: [NSAttributedString.Key: Any] = [
.font: font,
.paragraphStyle: paragraphStyle,
.baselineOffset: baselineOffset
]
return attrs
}
}
英文:
as you can see, after i build project on iOS 16.4 i faced a problem that baselineOffset is not like on iOS 16.0.
what should i do?
this is my code:
class ViewController: UIViewController {
@IBOutlet weak var label: UILabel!
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
self.label.setText("Hello World!")
}
}
extension UILabel {
func setText(_ text: String) {
let attrs = self.generateFontAttr()
self.attributedText = NSAttributedString(string: text, attributes: attrs)
}
private func generateFontAttr() -> [NSAttributedString.Key: Any] {
let paragraphStyle = NSMutableParagraphStyle()
paragraphStyle.maximumLineHeight = 120
paragraphStyle.minimumLineHeight = 120
let font = UIFont.systemFont(ofSize: 18)
let baselineOffset = 20
let attrs: [NSAttributedString.Key: Any] = [
.font: font,
.paragraphStyle: paragraphStyle,
.baselineOffset: baselineOffset
]
return attrs
}
}
答案1
得分: 3
确实，在iOS 16.4中，baselineOffset 的工作方式发生了变化。
看起来苹果修复了UILabel的旧 bug。早先，UILabel 的 baselineOffset 值需要翻倍，原因不明。而对于 UITextView，baselineOffset 的工作正常，无需翻倍。
如果您希望在iOS的两个版本上实现相同的行为，您可以尝试将以下代码进行替换：
let baselineOffset = 20
替换为：
let baselineOffset: CGFloat = {
if #available(iOS 16.4, *) {
return 40
} else {
return 20
}
}()
英文:
Indeed there has been a change in how baselineOffset works in iOS 16.4.
It looks like Apple fixed an old bug with UILabel baselineOffset. Earlier the baselineOffset value had to be doubled for unknown reasons. For UITextView baselineOffset worked fine without doubling.
> what should i do?
Your question is not precise but if you would like to achieve the same behavior on both versions of iOS, you can try to replace:
<!-- language: swift -->
let baselineOffset = 20
to
<!-- language: swift -->
let baselineOffset: CGFloat = {
if #available(iOS 16.4, *) {
return 40
} else {
return 20
}
}()
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