UINavigationItem 是 UINavigationBar 上的东西
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导航栏是通过push与pop的堆栈操作来对item进行管理的,同样,每一个Item自身也有许多属性可供我们进行自定制。
Item,从英文上来理解,它可以解释为一个项目,因此,item不是一个简单的label标题,也不是一个简单的button按钮,它是导航栏中管理的一个项目的抽象。说起来有些难于理解,通过代码,我们就能很好的理解Item的意义。
以下是一些方法和属性
1 //NS_CLASS_AVAILABLE_ios(2_0) @interface UINavigationItem : NSObject <NSCoding>
2 //
3 //初始化一个带有文本的UINavigationItem
4 - (instancetype)initWithTitle:(NSString *)title NS_DESIGNATED_INITIALIZER;
5 - (nullable instancetype)initWithCoder:(NSCoder *)coder NS_DESIGNATED_INITIALIZER;
6 //
7 //设置和获取UINavigationItem的文本
8 @property(nullable, nonatomic,copy) NSString *title; // Title when topmost on the stack. default is nil
9 //设置一个View类型的item:
10 @property(nullable, nonatomic,strong) UIView *titleView; // Custom view to use in lieu of a title. May be sized horizontally. Only used when item is topmost on the stack.
11
12 //这段文字会显示在item的上方:
13 @property(nullable,nonatomic,copy) NSString *prompt __TVOS_PROHIBITED; // Explanatory text to display above the navigation bar buttons.
14
15 //一个UINavigationItem中,还可以包含许多BarButtonItem,BarButtonItem是一系列的按钮,会出现在导航栏的左侧或者右侧
16 //设置返回按钮
17 @property(nullable,nonatomic,strong) UIBarButtonItem *backBarButtonItem __TVOS_PROHIBITED; // Bar button item to use for the back button in the child navigation item.
18 //
19 //设置在push出来新的item的时候,隐藏前面的返回按钮
20 @property(nonatomic,assign) BOOL hidesBackButton __TVOS_PROHIBITED; // If YES, this navigation item will hide the back button when it‘s on top of the stack.
21 - (void)setHidesBackButton:(BOOL)hidesBackButton animated:(BOOL)animated __TVOS_PROHIBITED;
22 //
23 ///* Use these properties to set multiple items in a navigation bar.
24 // The older single properties (leftBarButtonItem and rightBarButtonItem) now refer to
25 // the first item in the respective array of items.
26 //
27 // NOTE: You‘ll achieve the best results if you use either the singular properties or
28 // the plural properties consistently and don‘t try to mix them.
29 //
30 // leftBarButtonItems are placed in the navigation bar left to right with the first
31 // item in the list at the left outside edge and left aligned.
32 // rightBarButtonItems are placed right to left with the first item in the list at
33 // the right outside edge and right aligned.
34 // */
35 //设置左右按钮组
36 @property(nullable,nonatomic,copy) NSArray<UIBarButtonItem *> *leftBarButtonItems NS_AVAILABLE_IOS(5_0);
37 @property(nullable,nonatomic,copy) NSArray<UIBarButtonItem *> *rightBarButtonItems NS_AVAILABLE_IOS(5_0);
38 - (void)setLeftBarButtonItems:(nullable NSArray<UIBarButtonItem *> *)items animated:(BOOL)animated NS_AVAILABLE_IOS(5_0);
39 - (void)setRightBarButtonItems:(nullable NSArray<UIBarButtonItem *> *)items animated:(BOOL)animated NS_AVAILABLE_IOS(5_0);
40 //
41 ///* By default, the leftItemsSupplementBackButton property is NO. In this case,
42 // the back button is not drawn and the left item or items replace it. If you
43 // would like the left items to appear in addition to the back button (as opposed to instead of it)
44 // set leftItemsSupplementBackButton to YES.
45 // */
46 //是否隐藏返回按钮,
47 @property(nonatomic) BOOL leftItemsSupplementBackButton NS_AVAILABLE_IOS(5_0) __TVOS_PROHIBITED;
48 //
49 //// Some navigation items want to display a custom left or right item when they‘re on top of the stack.
50 //// A custom left item replaces the regular back button unless you set leftItemsSupplementBackButton to YES
51 //设置左右按钮
52 @property(nullable, nonatomic,strong) UIBarButtonItem *leftBarButtonItem;
53 @property(nullable, nonatomic,strong) UIBarButtonItem *rightBarButtonItem;
54 - (void)setLeftBarButtonItem:(nullable UIBarButtonItem *)item animated:(BOOL)animated;
55 - (void)setRightBarButtonItem:(nullable UIBarButtonItem *)item animated:(BOOL)animated;
56 //
57 @end
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