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NSAttributtedString get attribute value
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| func attributeValue<T>(_ key: NSAttributedStringKey) -> T? { | |
| let attributes = self.attributes(at: 0, effectiveRange: nil) | |
| guard attributes.keys.contains(key), let val = attributes[key] else { | |
| return nil | |
| } | |
| return val as? T | |
| } |
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