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有关导航栏的相关认识

1、在导航栏上添加按钮,又两个属性:

navigationItem.rightBarButtonItem和navigationItem.leftBarButtonItem

2、默认情况下,导航栏上的左右按钮只能设置一张图片,要想设置普通和高亮的图片,徐自定义按钮,将按钮传给navigationItem

  具体实现的代码如下事例:

UIButton * leftButton = [UIButton buttonWithType:UIButtonTypeCustom];
    [leftButton setBackgroundImage:[UIImage imageWithNamed:@"navigationbar_friendsearch"] forState:UIControlStateNormal];

    [leftButton setBackgroundImage:[UIImage imageNamed:@"navigationbar_friendsearch_highlighted"] forState:UIControlStateHighlighted];
    leftButton.frame = (CGRect){CGPointZero,leftButton.currentBackgroundImage.size};
    
    [leftButton addTarget:self action:@selector(findFriend) forControlEvents:UIControlEventTouchUpInside];
    self.navigationItem.leftBarButtonItem = [[UIBarButtonItem alloc]initWithCustomView:leftButton];