ios - 在 ios6 的导航栏上放置自定义按钮不起作用

Question

我对此进行了大量研究，并使用了几种不同的方法。此代码位于我的 ViewController.m 中:

1)第一种方法

UIImage *settingsimage = [UIImage imageNamed:@"gearicon"];
  UIBarButtonItem *settingsBarButton =[[UIBarButtonItem alloc] initWithImage:settingsimage style:(UIBarButtonItemStylePlain) target:self action:@selector(switchpages)];

  self.navigationItem.leftBarButtonItem = settingsBarButton;

此代码执行时没有任何错误，但没有出现按钮!

2)第二种方法

UIButton *settingbtn = [UIButton buttonWithType:UIButtonTypeCustom];
    [settingbtn addTarget:self action:@selector(switchpages) forControlEvents:UIControlEventTouchUpInside];
    [settingbtn setImage:[UIImage imageNamed:@"gearicon.png"] forState:UIControlStateNormal];
    UIBarButtonItem *newBarItem = [[UIBarButtonItem alloc] initWithCustomView:settingbtn];

    self.navigationItem.leftBarButtonItem = newBarItem;

与上面相同，没有错误，但没有按钮。请帮助我哪里出错了。谢谢。

Answer 1

所以，这是我的最终解决方案。这会在没有边框的导航栏的右上角放置一个“齿轮”图标:

.h

 @property (strong, nonatomic) IBOutlet UINavigationBar *navBar;
 @property (strong, nonatomic) IBOutlet UINavigationItem *settingsbtn;
 @property(strong, nonatomic)UIButton *navigationButton;

.m

 @synthesize navigationButton;
 @synthesize settingsbtn;
 @synthesize navBar;

ViewDidLoad

//custom settings button
navigationButton = [UIButton buttonWithType:UIButtonTypeCustom];
[navigationButton addTarget:self action:@selector(swithpages)   forControlEvents:UIControlEventTouchUpInside];
[navigationButton setImage:[UIImage imageNamed:@"gearicon.png"]forState:UIControlStateNormal];
[navigationButton setFrame:CGRectMake(0, 0, 30, 35)];
UIBarButtonItem *settingsbutton = [[UIBarButtonItem alloc] initWithCustomView:navigationButton];

settingsbtn.rightBarButtonItem = settingsbutton;

我唯一缺少的是让按钮在按下时“发光”(就像苹果的远程应用程序一样)，而不是默认情况下改变颜色。