UIBarButtonItem-添加自定义Left或者Right按钮

为 UINavigationController添加 UINavigationItem，我们可以这样写：

 

1.添加返回导航按钮backBarButtonItem

 

1.用系统自带的返回按钮

 

UIBarButtonItem *leftBarButtonItem = [[UIBarButtonItem alloc]

                                         initWithTitle:@"返回"

                                         style:UIBarButtonSystemItemCancel

                                         target:self

                                         action:@selector(doClickBackAction:)];

    self.navigationItem.backBarButtonItem = leftBarButtonItem;

 

2.自己定义返回按钮

UIImage* backImage = [UIImage imageNamed:@"btn_back.png"];

   CGRect backframe = CGRectMake(0,0,54,30);

   UIButton* backButton= [[UIButton alloc] initWithFrame:backframe];

    [backButton setBackgroundImage:backImage forState:UIControlStateNormal];

    [backButton setTitle:@"直播" forState:UIControlStateNormal];

 backButton.titleLabel.font=[UIFont systemFontOfSize:13];

    [backButton addTarget:self action:@selector(doClickBackAction:) forControlEvents:UIControlEventTouchUpInside];

    

   UIBarButtonItem* leftBarButtonItem = [[UIBarButtonItem alloc] initWithCustomView:backButton];

   UIBarButtonItem* leftBarButtonItem = [[UIBarButtonItem alloc] init];

    self.navigationItem.leftBarButtonItem = leftBarButtonItem;

    [leftBarButtonItem release];

    [backButton release];