console.log(sid);
创建朋友按钮
_id
创建一个圆形按钮
console.log(ob);
创建个人资料按钮
unidentified
最后一行是给出错误的行:不能在属性初始值设定项中使用实例成员'profileButton
答案 0 :(得分:2)
你得到的错误信息的重要部分是第二部分,遗憾的是你省略了。它是property initializer is initialized before self
。
在没有属性初始化模式的情况下重写后,您将获得的下一个错误是Expected declaration
。这意味着code segment
需要在函数内部。比如viewDidLoad()
。
因此,要使其工作,您的代码需要修改为类似于:
import UIKit
class MenuBar: UIView {
func createStackView() -> UIStackView {
let buttonWidth = 50
let friendsButton = UIImageView()
friendsButton.translatesAutoresizingMaskIntoConstraints = false
friendsButton.image = #imageLiteral(resourceName: "Friends Button")
friendsButton.contentMode = .scaleAspectFill
friendsButton.widthAnchor.constraint(equalToConstant: 50)
friendsButton.heightAnchor.constraint(equalToConstant: 50)
let circleButton = UIImageView()
circleButton.translatesAutoresizingMaskIntoConstraints = false
circleButton.image = #imageLiteral(resourceName: "Small Circle Button")
circleButton.contentMode = .scaleAspectFill
circleButton.widthAnchor.constraint(equalToConstant: 50)
circleButton.heightAnchor.constraint(equalToConstant: 50)
let profileButton = UIImageView()
profileButton.translatesAutoresizingMaskIntoConstraints = false
profileButton.image = #imageLiteral(resourceName: "Profile Button")
profileButton.contentMode = .scaleAspectFill
profileButton.widthAnchor.constraint(equalToConstant: 50)
profileButton.heightAnchor.constraint(equalToConstant: 50)
let stackView = UIStackView(arrangedSubviews: [profileButton, circleButton, profileButton])
return stackView
}
}