• ios開發(fā)中經(jīng)常碰到各種需求，比如要求導(dǎo)航欄的顏色和self.view的顏色一樣，當我們直接設(shè)置navigationBar的顏色和view一樣時，我們會發(fā)現(xiàn)navigationBar還會有一條分割線留下，本文就是介紹怎么隱藏導(dǎo)航欄底部的分割線的。

• 第一種方法：不會影響導(dǎo)航欄translucent 半透明的顯示

• 首先在viewDidLoad 定義一個 UIImageView *navigationImageView 來存儲底部分割線。

UIImageView *navigationImageView = [self findHairlineImageViewUnder:self.navigationController.navigationBar];
self.navigationImageView = navigationImageView;

-(UIImageView *)findHairlineImageViewUnder:(UIView *)view {
   if ([view isKindOfClass:UIImageView.class] && view.bounds.size.height <= 1.0) {
       return (UIImageView *)view;
   }
   for (UIView *subview in view.subviews) {
       UIImageView *imageView = [self findHairlineImageViewUnder:subview];
       if (imageView) {
           return imageView;
       }
   }
   return nil;
}

-(void)viewWillAppear:(BOOL)animated {
 [super viewWillAppear:animated]; self.navigationImageView.hidden = YES;
}

-(void)viewDidDisappear:(BOOL)animated {
 [super viewDidDisappear:animated]; self.navigationImageView.hidden = NO;
}

• 第二種方法：會刪除導(dǎo)航欄 translucent 半透明的顯示。

[self.navigationController.navigationBar setBackgroundImage:[UIImage imageNamed:@"navImage"] forBarPosition:UIBarPositionAny barMetrics:UIBarMetricsDefault];
    
[self.navigationController.navigationBar setShadowImage:[UIImage new]];