导航栏标题不粗体

Question

When I'm in the storyboard, the navigation bar title is shown as bold in the Storyboard as default but when you run the app in simulator and device, it isn't bold. Annoyingly it isn't possible to change the font size from interface builder.

Below you can see the difference between what's shown on interface builder and the simulator.

Interface builder:

Simulator:

I'm aware that I can change the font using something like this: self.navigationController?.navigationBar.titleTextAttributes = [NSFontAttributeName: UIFont(name: "YOUR-FONT-NAME-WEIGHT", size: 24)! That would be perfect but I want to keep the font to the default SF font.

Is there a workaround this? Any reason why this happens?

Answer 1

Use this code in your viewDidLoad to change font size

self.navigationController?.navigationBar.titleTextAttributes = [
    NSFontAttributeName: UIFont.systemFont(ofSize: 20, weight: UIFontWeightHeavy)
]

For swift 4:

self.navigationController?.navigationBar.titleTextAttributes = [
    NSAttributedStringKey.font: UIFont.systemFont(ofSize: 20, weight: UIFont.Weight.heavy)
]

Before in simulator it looks like

And with that code, it looks like

Answer 2

只需使用UIFont.systemFont即可获取默认的SF字体。

self.navigationController?.navigationBar.titleTextAttributes = [NSFontAttributeName: UIFont.systemFont(ofSize:24, weight: .bold)]

Answer 3

斯威夫特4：

self.navigationController?.navigationBar.titleTextAttributes = [NSAttributedStringKey.font: UIFont.systemFont(ofSize: 20, weight: UIFont.Weight.heavy)]