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iOS-隐藏Navigation導航欄線

去除navigationBar上那條線:

///隐藏navigationBar導航欄線(直接寫在UINavigationController-viewDidLoad方法裡面即可)

    UIView *backgroundView = [self.navigationBar subviews].firstObject;

    _lineView = backgroundView.subviews.firstObject;

    _lineView.hidden = YES;      

去除前(效果圖):

去除後(效果圖):