Swift三元语法错误 [英] Swift ternary syntax error

问题描述

我一直都在使用Objective-C编程，而我对Swift还是陌生的。这个错误Xcode让我感到非常困惑。

I used to program in Objective-C all the time and I am new to Swift. This error Xcode gives me really confuse me.

func renderBufferAreaBAUp(yOffset: CGFloat, amount: CGFloat, ifLeft: Bool)
{     
        var topViewIndexForIndexAdjust = ifLeft?leftTopIndex:rightTopIndex
}

在这行我打算使用三元。 leftTopIndex和rightTopIndex都是Int类型。但是Xcode给了我这行代码，

On this line I intended to use ternary. leftTopIndex and rightTopIndex are both Int type. However Xcode gives me those on this particular line,

行上的连续语句必须用';'
期望的表达式

Consecutive statements on a line must be separated by ';' Expected expression

有人可以告诉我这是什么意思吗？谢谢。

Can anybody tell me what those mean? Thanks.

推荐答案

迅速的错误消息通常是晦涩的，没有帮助。您的真正问题是Swift需要在？和：周围有一些空间。

Swift error messages are frequently cryptic and not helpful. Your real problem is that Swift needs some space around the ? and :.

var topViewIndexForIndexAdjust = ifLeft ? leftTopIndex : rightTopIndex

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