添加自定义按钮到导航控制器没有边框

Question

我向导航控制器添加自定义按钮

    UIBarButtonItem *backButton = [[UIBarButtonItem alloc] initWithImage:[UIImage imageNamed:@"back.png"]
                                                                   style:UIBarButtonItemStylePlain
                                                                  target:self
                                                                  action:@selector(backAction)];
    self.navigationItem.leftBarButtonItem = backButton;

它工作正常,但按钮出现边框.我该如何解决这个问题？

更新 我找到了解决方案

   
 UIButton *button = [[UIButton alloc] initWithFrame:CGRectMake(0, 0, 25, 25)];
    [button setImage:[UIImage imageNamed:@"back.png"] forState:UIControlStateNormal];
    [button addTarget:self action:@selector(buttonFavoriteClicked) forControlEvents:UIControlEventTouchUpInside];
    UIBarButtonItem *back = [[UIBarButtonItem alloc] initWithCustomView:button];
    [button release];
 

self.navigationItem.leftBarButtonItem = back;

Answer 1

试试这个.

UIButton *backButton = [[UIButton alloc] initWithFrame:CGRectMake(0, 0, button_width, button_height)];
[backButton setImage:[UIImage imageNamed:@"back.png"] forState:UIControlStateNormal];
[backButton addTarget:self action:@selector(backAction) forControlEvents:UIControlEventTouchUpInside];
self.navigationItem.leftBarButtonItem = [[UIBarButtonItem alloc] initWithCustomView:backButton];