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自定义导航按钮UIBarButtonItem

基本上每个iOS APP里面都有导航,比如微信、QQ、支付宝。导航可以很方便地帮助我们管理视图控制器(UIViewController)。导航的重要性不言而喻,基本上是每一位iOS初学者都要接触到的问题。

iOS系统导航栏中有leftBarButtonItemrightBarButtonItem,我们可以根据自己的需求来自定义这两个UIBarButtonItem

四种创建方法

系统提供了四种创建的方法:

- (instancetype)initWithBarButtonSystemItem:(UIBarButtonSystemItem)systemItem target:(id)target action:(SEL)action;


- (instancetype)initWithImage:(UIImage *)image style:(UIBarButtonItemStyle)style target:(id)target action:(SEL)action;


- (instancetype)initWithTitle:(NSString *)title style:(UIBarButtonItemStyle)style target:(id)target action:(SEL)action;

- (instancetype)initWithBarButtonSystemItem:(UIBarButtonSystemItem)systemItem target:(id)target action:(SEL)action;

- (instancetype)initWithCustomView:(UIView *)customView;

通过系统UIBarButtonSystemItem创建

自定义rightBarButtonItem,代码如下:

self.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemDone target:self action:@selector(right:)];

UIBarButtonSystemItem有以下样式可以供选择:

typedef NS_ENUM(NSInteger, UIBarButtonSystemItem) {
    UIBarButtonSystemItemDone,
    UIBarButtonSystemItemCancel,
    UIBarButtonSystemItemEdit,  
    UIBarButtonSystemItemSave,  
    UIBarButtonSystemItemAdd,
    UIBarButtonSystemItemFlexibleSpace,
    UIBarButtonSystemItemFixedSpace,
    UIBarButtonSystemItemCompose,
    UIBarButtonSystemItemReply,
    UIBarButtonSystemItemAction,
    UIBarButtonSystemItemOrganize,
    UIBarButtonSystemItemBookmarks,
    UIBarButtonSystemItemSearch,
    UIBarButtonSystemItemRefresh,
    UIBarButtonSystemItemStop,
    UIBarButtonSystemItemCamera,
    UIBarButtonSystemItemTrash,
    UIBarButtonSystemItemPlay,
    UIBarButtonSystemItemPause,
    UIBarButtonSystemItemRewind,
    UIBarButtonSystemItemFastForward,
#if __IPHONE_3_0 <= __IPHONE_OS_VERSION_MAX_ALLOWED
    UIBarButtonSystemItemUndo,
    UIBarButtonSystemItemRedo,
#endif
#if __IPHONE_4_0 <= __IPHONE_OS_VERSION_MAX_ALLOWED
    UIBarButtonSystemItemPageCurl,
#endif
};

最后别忘了实现right:方法:

- (void)right:(id)sender
{
    NSLog(@"rightBarButtonItem");
}

自定义文字的UIBarButtonItem

在文章关于导航栏的六个小技巧的第五个技巧里面有自定义rightBarButtonItem

self.navigationItem.leftBarButtonItem = [[UIBarButtonItem alloc] initWithTitle:@"back" style:UIBarButtonItemStylePlain target:self action:@selector(back:)];

UIBarButtonItemStyle有以下三种选择:

typedef NS_ENUM(NSInteger, UIBarButtonItemStyle) {
    UIBarButtonItemStylePlain,
    UIBarButtonItemStyleBordered NS_ENUM_DEPRECATED_IOS(2_0, 8_0, "Use UIBarButtonItemStylePlain when minimum deployment target is iOS7 or later"),
    UIBarButtonItemStyleDone,
};

实现back:方法:

- (void)back:(id)sender
{
    [self.navigationController popViewControllerAnimated:YES];
}

自定义照片的UIBarButtonItem

self.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc] initWithImage:[UIImage imageNamed:@"test"] style:UIBarButtonItemStylePlain target:self action:@selector(right:)];

自定义UIView的UIBarButtonItem

自定义UIView,然后通过initWithCustomView:方法来创建UIBarButtonItem

UIView *testView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 40, 60)];
self.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc] initWithCustomView:testView];

看到有朋友在后台提问:

刚哥,我现在即需要改那个导航原生的返回图片,也要改返回文字,应该怎么改呢,求指教。

其实,这个就可以用initWithCustomView:来解决,自定义UIView你可以放UIImageViewUILabel。可以自定义UIView,那么想怎么定义都是可以的。