默認情況下會有這條線
第一種方法:
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UINavigationBar *navigationBar = self.navigationController.navigationBar; // white.png圖片自己下載個純白色的色塊,或者自己ps做一個 [navigationBar setBackgroundImage:[UIImage imageNamed:@"white.png"] forBarPosition:UIBarPositionAny barMetrics:UIBarMetricsDefault]; [navigationBar setShadowImage:[UIImage new]]; |
運行後效果如下(此處原有的灰色背景色會被white.png代替):
PS:這是唯一一個隱藏這條線的官方用法,但是有一個缺陷-刪除了translucency(半透明)
第二種方法:
1)聲明UIImageView變量,存儲底部橫線
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@implementation MyViewController { UIImageView *navBarHairlineImageView; } |
2)在viewDidLoad中加入:
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navBarHairlineImageView = [self findHairlineImageViewUnder:navigationBar]; |
3)實現找出底部橫線的函數
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- (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; } |
4)最後在viewWillAppear,viewWillDisappear中處理
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- (void)viewWillAppear:(BOOL)animated { [super viewWillAppear:animated]; navBarHairlineImageView.hidden = YES; }
- (void)viewWillDisappear:(BOOL)animated { [super viewWillDisappear:animated]; navBarHairlineImageView.hidden = NO; } |
效果如下:
PS:第二種方法可以保持bar的translucent