“不允许在顶级表达”在Swift中的类的函数调用中 [英] "Expression are not allowed at top level" in function call of a class in Swift

问题描述

以下是我的代码..我不明白为什么每次都会出现此错误。

Following is my code.. I don't understand why this error shows me everytime.

import UIKit
import Foundation

class BaseLabel:UILabel
{
     func setFontAndTitle(FontName:String,FontSize:CGFloat,Title:String) {
        self.font = UIFont(name: FontName, size: FontSize)
        self.text = Title
    }

}

var lbl =  BaseLabel()
lbl.setFontAndTitle ("Areal", FontSize: 14, Title: "Check label") 

最后我得到错误表达式不允许在顶级

In the last line I am getting the the error "Expression are not allowed at top level"

推荐答案

您尝试在课外输入代码。你需要将它放在你的类中并包含在函数体中。请看一下我的解决方案：

You trying to typing code outside of class. You need to put it in you class and enclose in function body. Please take a look at my solution:

import UIKit
import Foundation

class BaseLabel:UILabel
{
    func setFontAndTitle(FontName:String,FontSize:CGFloat,Title:String) {
        self.font = UIFont(name: FontName, size: FontSize)
        self.text = Title
    }

    func changePropertiesOfLabel(){
    var lbl =  BaseLabel()
     lbl.setFontAndTitle ("Areal", FontSize: 14, Title: "Check label")
    }

}

这篇关于“不允许在顶级表达”在Swift中的类的函数调用中的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！