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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leftBarButtonItem
和rightBarButtonItem
,我们可以根据自己的需求来自定义这两个UIBarButtonItem
。
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;
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");
}
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];
}
self.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc] initWithImage:[UIImage imageNamed:@"test"] style:UIBarButtonItemStylePlain target:self action:@selector(right:)];
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UIImageView
和UILabel
。可以自定义UIView
,那么想怎么定义都是可以的。
iOS开发>学无止境 - 自定义导航按钮UIBarButtonItem
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原文地址:http://www.cnblogs.com/xvewuzhijing/p/5003823.html