ios 在 Swift 中将 Int 转换为 Double
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Convert Int to Double in Swift
提问by shadox
label.text = String(format:"%.1f hour", theOrder.bookingMins/60.0)
The above code just get the error:'Int' is not convertible to 'Double'
上面的代码只是得到错误：'Int' is not convertible to 'Double'
bookingMinsis of type Int, so how do I convert an Int to a Double in Swift? Seems not as simple as in C.
bookingMins是 Int 类型，那么如何在 Swift 中将 Int 转换为 Double？似乎不像在 C 中那么简单。
回答by YogevSitton
Try Double(theOrder.bookingMins)
尝试 Double(theOrder.bookingMins)
回答by EgzonArifi
What I prefer to do is to use computed properties. So I like to create an extension of Double and than add a property like below:
我更喜欢做的是使用计算属性。所以我喜欢创建 Double 的扩展，而不是添加如下属性：
extension Int {
var doubleValue: Double {
return Double(self)
}
}
And than you can use it in very Swifty way, I believe in future updates of swift language will be something similar.
比起您可以非常 Swifty 的方式使用它，我相信 Swift 语言的未来更新将是类似的。
let bookingMinutes = theOrder.bookingMins.doubleValue
in your case
在你的情况下
label.text = String(format: "%.1f hour", bookingMinutes / 60.0)
Style guide used: https://github.com/raywenderlich/swift-style-guide
回答by Mo Abdulmalik
label.text = String(format:"%.1f hour", Double(theOrder.bookingMins) /60.0)
回答by Krunal Patel
Swift 4/5
斯威夫特 4/5
let mins = Double(theOrder.bookingMins)
label.text = String(format:"%.1f hour", mins/60.0)
