小编Chr*_*ani的帖子

static func randomShape() -> Shape {
    // Find out count of possible shapes
    var maxValue = 0
    while let _ = self.init(rawValue: ++maxValue) {}
    // Generate random number from number of shapes
    let randomNumber = Int(arc4random_uniform(UInt32(maxValue)))
    // Create and return shape
    let shape = self.init(rawValue: randomNumber)!

    return shape
}

专注于 while let _ = self.init(rawValue: ++maxValue) {}

我和++Swift已经弃用的错误,但我不知道我怎么能改变我的方法仍然正常运行.

我尝试了MaxValue + = 1,我得到了错误

'+=' produces '()', not the expected contextual result type 'Int'

非常感谢您的帮助!