UITextAttributeFont在iOS 7中已弃用。您应该改用NS变体：
import UIKitlet appearance = UITabBarItem.appearance()let attributes = [NSFontAttributeName:UIFont(name: "American Typewriter", size: 20)]appearance.setTitleTextAttributes(attributes, forState: .Normal)
UITextAttributeFont在iOS 7中已弃用。您应该改用NS变体：
import UIKitlet appearance = UITabBarItem.appearance()let attributes = [NSFontAttributeName:UIFont(name: "American Typewriter", size: 20)]appearance.setTitleTextAttributes(attributes, forState: .Normal)
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