iOS Xib 适配字体

+ (void)load {
    Method swizeeMethod = class_getInstanceMethod([UILabel class], @selector(d_awakeFromNib));
    Method originalMethod = class_getInstanceMethod([UILabel class], @selector(awakeFromNib));
    
    if (!class_addMethod([UILabel class], @selector(awakeFromNib), method_getImplementation(swizeeMethod), method_getTypeEncoding(swizeeMethod))) {
        
        method_exchangeImplementations(originalMethod,swizeeMethod);
    } else {
        class_replaceMethod(self, @selector(d_awakeFromNib), method_getImplementation(originalMethod), method_getTypeEncoding(originalMethod));
    }
}

- (void)d_awakeFromNib {
// 375 是设计师一般都习惯以iphone6设计UI
    CGFloat scaleSize = [UIScreen mainScreen].bounds.size.width/375;
    self.font = [UIFont fontWithDescriptor:self.font.fontDescriptor size:self.font.pointSize * scaleSize];
    
    [self d_awakeFromNib];
}