Created
January 9, 2018 08:39
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[SWIFT 4.0] New variable in extension for existed class
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| class Testing { | |
| } | |
| private var key: Void? | |
| extension Testing { | |
| var title: String { | |
| get { | |
| guard let value = objc_getAssociatedObject(self, &key) as? String else { | |
| return "" | |
| } | |
| return value | |
| } | |
| set { | |
| objc_setAssociatedObject(self, &key, newValue, .OBJC_ASSOCIATION_RETAIN_NONATOMIC) | |
| } | |
| } | |
| } |
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