IOS UI 自定义navigationBar布局

• navigationBar背景设置

    //1. 配置navigationBar背景图片
    [self.navigationController.navigationBar setBackgroundImage:[UIImage
    imageNamed:@"header_bg.png" ] 
    forBarMetrics:UIBarMetricsDefault];

• 设置中间标题图片

    //2.配置中间标题为图片
    UIImageView *imageView = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, 60, 35)];
    imageView.image = [UIImage imageNamed:@"logo_title.png"];
    self.navigationItem.titleView=imageView;

• 设置navigationBar左右按钮
  navigationBar按钮常见样式有三种，分别为文本样式、系统样式、自定义样式

1.文本样式

    UIBarButtonItem *textItem = [[UIBarButtonItem alloc] initWithTitle:@"分类" 
    style:UIBarButtonItemStylePlain target:self 
    action:@selector(dealConfig:)];

2.系统样式

UIBarButtonItem *systemItem = [[UIBarButtonItem alloc] 
initWithBarButtonSystemItem:UIBarButtonSystemItemAdd target:self 
action:@selector(dealConfig:)];

3.自定义样式

UIButton *leftButton = [UIButton buttonWithType:UIButtonTypeCustom];

leftButton.frame = CGRectMake(0, 0, 45, 30); 

 [leftButton setBackgroundImage:[UIImage imageNamed:@"photo_left_nav.png"] forState:UIControlStateNormal];

[leftButton addTarget:self action:@selector(dealConfig:) forControlEvents:UIControlEventTouchUpInside];

UIBarButtonItem *leftItem = [[UIBarButtonItem alloc] initWithCustomView:leftButton];

4.添加到界面上

self.navigationItem.leftBarButtonItem = leftItem;
self.navigationItem.rightBarButtonItem = rightItem;

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