mqzhot / mtransparentnav Goto Github PK

• (UIColor *)navTitleColor {
  UIColor *color = objc_getAssociatedObject(self, vcTitleColorKey);

  if (color == nil) {
  color = self.navigationController.navigationBar.titleTextAttributes[NSForegroundColorAttributeName];
  }
  return color;
  }

• (void)setNavTitleColor:(UIColor *)navTitleColor {
  NSMutableDictionary *textAttrs = [NSMutableDictionary dictionary];
  textAttrs[NSForegroundColorAttributeName] = navTitleColor;
  [self.navigationController.navigationBar setTitleTextAttributes:textAttrs];
  objc_setAssociatedObject(self, vcTitleColorKey, navTitleColor, OBJC_ASSOCIATION_RETAIN_NONATOMIC);

}

• (void)setNavigationBackgroundAlpha:(CGFloat)navAlpha {
  CGFloat alpha = MAX(MIN(navAlpha, 1), 0);
  UIView *barBackground = self.navigationBar.subviews[0];
  UIView *colorView = [self getColorViewOnView:barBackground];
  colorView.alpha = alpha;
  if ([barBackground valueForKey:@"_shadowView"]) {
  UIView *shadowView = [barBackground valueForKey:@"_shadowView"];
  shadowView.alpha = alpha;
  shadowView.hidden = alpha == 0 ? YES : NO;
  }
  }

这个方法报错在iOS 12下

在ios9 viewdidload 中设置 self.navAlpha = 0; 导航栏未变透明。