I need to use San Francisco font in my app. But I'm not sure if the default font (system font) in my current Xcode is SF font. My app is supporting iOS 7 and above and I need all OS version to use SF font.I need to use San Francisco font in my app. But
阅读背景：
Xcode 7.3.1的默认字体（系统字体）是San Francisco字体？
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