ios - 编译器无法对这个表达式 swift 4 进行类型检查？

Question

更新 xCode 后，我的代码中出现了这个错误:

The compiler is unable to type-check this expression in reasonable time; try breaking up the expression into distinct sub-expressions

代码:

//check popup in window frame

let spaceFromLeftSide = cutOutViewX.constant + cutOutViewWidth.constant/2 - (options.textWidth + padding*2)/2

if spaceFromLeftSide < 0{

    if options.side == .bottom {
        messageRightSpaceFromBottomDot.constant -= spaceFromLeftSide - padding
    }
    else if options.side == .top{
        messageRightSpaceFromTopDot.constant += spaceFromLeftSide - padding
    }
}

let spaceFromRightSide = cutOutViewX.constant + cutOutViewWidth.constant/2 + (options.textWidth + padding*2)/2

if spaceFromRightSide > targetView.frame.size.width{

    if options.side == .bottom {
        messageRightSpaceFromBottomDot.constant -= spaceFromRightSide - ( targetView.frame.size.width )
    }
    else if options.side == .top{
        messageRightSpaceFromTopDot.constant += spaceFromRightSide - ( targetView.frame.size.width )
    }
}

行错误:

let spaceFromRightSide = cutOutViewX.constant + cutOutViewWidth.constant/2 + (options.textWidth + padding*2)/2

如何解决这个问题？

Answer 1

The compiler is unable to type-check this expression in reasonable time; try breaking up the expression into distinct sub-expressions

当 swift 编译器发现表达式计算冗长时，会出现此错误。更多详情 check here

要解决这个问题，您只需将表达式分解成更小的部分。就像:

let cutOutxOrigin = 3 * cutOutViewX.constant / 2
let actualPadding = (options.textWidth + padding * 2) / 2

let spaceFromRightSide = cutOutxOrigin + actualPadding