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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。

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