开发中遇到各种字体样式 各种大小设置 代码繁琐 由于本人太懒 不想写那么麻烦代码，于是乎 小装了 一把。
上代码 wtm

OC

_label.font = [UIFont regular:15];

swift

label.font = .regular(15)

.h文件

#import <UIKit/UIKit.h>

NS_ASSUME_NONNULL_BEGIN

@interface UIFont (Y)

+ (UIFont*)medium:(CGFloat)font;
+ (UIFont*)bold:(CGFloat)font;
+ (UIFont*)regular:(CGFloat)font;
+ (UIFont*)font:(CGFloat)font;
@end

NS_ASSUME_NONNULL_END

///点m文件

#import "UIFont+Y.h"

@implementation UIFont (Y)

+ (UIFont*)medium:(CGFloat)font{
    return [UIFont systemFontOfSize:font weight:(UIFontWeightMedium)];
}

+ (UIFont*)bold:(CGFloat)font{
    return [UIFont systemFontOfSize:font weight:(UIFontWeightBold)];
}

+ (UIFont*)regular:(CGFloat)font{
    return [UIFont systemFontOfSize:font weight:(UIFontWeightRegular)];
}

+ (UIFont*)font:(CGFloat)font{
    return [UIFont systemFontOfSize:font];
}

@end

非常好用 ，妈耶