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                ## Swift 運算符之三元運算符 ``` question ? answer1 : answer2 ``` ### Demo 場景:當手機電量小于 20 的時候,顯示紅色,當大于 20 的時候顯示綠色。 ``` import UIKit var battery = 18 var batterColor: UIColor if battery <= 20 { batterColor = UIColor.red } else { batterColor = UIColor.green } batterColor var batterColor2 = ( battery <= 20 ) ? UIColor.red : UIColor.green ```
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