字体粗细调整

UIFont* font = [UIFont systemFontOfSize:14 weight:UIFontWeightThin];

UIKIT_EXTERN const CGFloat UIFontWeightUltraLight ;//极细

UIKIT_EXTERN const CGFloat UIFontWeightThin ;      //较细;依次类推,逐渐加粗

UIKIT_EXTERN const CGFloat UIFontWeightLight ;

UIKIT_EXTERN const CGFloat UIFontWeightRegular ;

UIKIT_EXTERN const CGFloat UIFontWeightMedium ;

UIKIT_EXTERN const CGFloat UIFontWeightSemibold ;

UIKIT_EXTERN const CGFloat UIFontWeightBold ;

UIKIT_EXTERN const CGFloat UIFontWeightHeavy ;

UIKIT_EXTERN const CGFloat UIFontWeightBlack ;    //极粗

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