NSAttributedString可在模擬器中的iPhone SE上運行，但不適用於iPhone 7

Question

我設置了一個屬性字符串，該字符串在使用iPhone SE而不是iPhone 7的模擬器中可以正常工作。沒有錯誤，它什么也沒顯示。

我還收到關於Expression implicitly coerced from NSObject? to Any的屬性Expression implicitly coerced from NSObject? to Any的警告Expression implicitly coerced from NSObject? to Any Expression implicitly coerced from NSObject? to Any

這是我的代碼：

let firstName = "Mark"

let welcomeAttributes = [ NSForegroundColorAttributeName: Constants.APP_TEXT_COLOR,
                                              NSFontAttributeName: Constants.APP_CELL_FONT ]

let userNameAttributes = [ NSForegroundColorAttributeName: Constants.APP_THEME_COLOR,
                                               NSFontAttributeName: Constants.APP_CELL_FONT ]

let unformattedUserFirstName = firstName

let userFirstName = NSAttributedString(string: unformattedUserFirstName, attributes: userNameAttributes)

let unformattedWelcome = "Welcome "

let welcome = NSAttributedString(string: unformattedWelcome, attributes: welcomeAttributes)

let welcomeString = NSMutableAttributedString()

welcomeString.append(welcome)

welcomeString.append(userFirstName)

self.welcomeLabel.attributedText = welcomeString

---

let welcomeLabel: UILabel = {
    let label = UILabel()
    label.backgroundColor = .white
    label.font = Constants.APP_CELL_FONT
    label.textColor = Constants.APP_TEXT_COLOR
    let welcomeAttributes = [ NSForegroundColorAttributeName: Constants.APP_TEXT_COLOR,
                              NSFontAttributeName: Constants.APP_CELL_FONT ]
    let unformattedWelcome = "Welcome"
    let welcome = NSAttributedString(string: unformattedWelcome, attributes: welcomeAttributes)
    let welcomeString = NSMutableAttributedString()
    welcomeString.append(welcome)
    label.attributedText = welcomeString
    return label
}()

---

static let APP_CELL_FONT = UIFont(name: "Muli", size: 12)
static let APP_TEXT_COLOR:UIColor = UIColor(red: 50.0/255.0, green: 50.0/255.0, blue: 50.0/255.0, alpha: 1.0)
static let APP_THEME_COLOR:UIColor = UIColor(red: 231.0/255.0, green: 76.0/255.0, blue: 60.0/255.0, alpha: 1.0)

這些字體已安裝：

Muli
== Muli-Light
== Muli-ExtraLight
== Muli

為了驗證這一點，我在應用程序委托中運行了以下代碼。

    for family: String in UIFont.familyNames
    {
        print("\(family)")
        for names: String in UIFont.fontNames(forFamilyName: family)
        {
            print("== \(names)")
        }
    }

Answer 1

出現此問題的主要原因是字體，如果這是自定義字體，請檢查字體的實際名稱。