iOS 导航栏控制器UINavigationController 、UINavigationBar、UINavigationItem 之间的关系(二)
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UINavigationBar相关属性
UINavigationItem相关属性
1、导航栏标题内容
@property(nullable, nonatomic,copy) NSString *title;
2、自定义导航栏上显示的内容,可以添加按钮等其他显示内容。某些app中在导航栏上左边显示内容,旁边有个下拉按钮等
@property(nullable, nonatomic,strong) UIView *titleView;
示列:注意高度不能超过导航栏的高度
UIView *customView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, CGRectGetWidth(self.view.frame), 44)]; customView.backgroundColor = [UIColor redColor]; self.navigationItem.titleView = customView;
3、设置prompt属性的话,整个导航栏上部分会多出一部分高度30px,来显示对应的描述文字
@property(nullable,nonatomic,copy) NSString *prompt
4、隐藏返回按钮,注意需要在viewWillAppear方法中写,e.g:A push 到B,则需要在B的viewWillAppear中;
//都可以隐藏返回按钮@property(nonatomic,assign) BOOL hidesBackButton- (void)setHidesBackButton:(BOOL)hidesBackButton animated:(BOOL)animated;
示列:
//进入该页面时隐藏,离开时显示-(void)viewWillAppear:(BOOL)animated{ [super viewWillAppear:animated]; self.navigationItem.hidesBackButton = YES;}-(void)viewWillDisappear:(BOOL)animated { [super viewWillDisappea:animatedr]; self.navigationItem.hidesBackButton = NO;}
5、自定义返回按钮的样式,可以是文字或者是图片,注意这个属性,若是A push B,你若是在B中设置backBarButtonItem属性,那么起作用的是Bpush到的下个页面,要是B中的返回按钮样式也修改,可以在A中设置这个属性,或者在B中使用leftBarButtonItem属性,大部分我们都是用leftBarButtonItem属性
@property(nullable,nonatomic,strong) UIBarButtonItem *backBarButtonItem
示列:
self.navigationItem.backBarButtonItem = [[UIBarButtonItem alloc] initWithImage:[UIImage imageNamed:@"back"] style:UIBarButtonItemStylePlain target:self action:@selector(back)];
6、可设置当前页面的返回按钮和右上角的按钮
@property(nullable, nonatomic,strong) UIBarButtonItem *leftBarButtonItem;@property(nullable, nonatomic,strong) UIBarButtonItem *rightBarButtonItem;- (void)setLeftBarButtonItem:(nullable UIBarButtonItem *)item animated:(BOOL)animated;- - (void)setRightBarButtonItem:(nullable UIBarButtonItem *)item animated:(BOOL)animated;
示列:
//返回按钮 self.navigationItem.leftBarButtonItem = [[UIBarButtonItem alloc] initWithImage:[UIImage imageNamed:@"back"] style:UIBarButtonItemStylePlain target:self action:@selector(goBack)];//右上角按钮 rightBarButtonItem = [[UIBarButtonItem alloc] initWithImage:[UIImage imageNamed:@"edit"] style:UIBarButtonItemStylePlain target:self action:@selector(edit)];
7、有时候左上角和右上角有多个按钮,那么可以用如下的方法
@property(nullable,nonatomic,copy) NSArray<UIBarButtonItem *> *leftBarButtonItems ;@property(nullable,nonatomic,copy) NSArray<UIBarButtonItem *> *rightBarButtonItems ;- (void)setLeftBarButtonItems:(nullable NSArray<UIBarButtonItem *> *)items animated:(BOOL)animated;- - (void)setRightBarButtonItems:(nullable NSArray<UIBarButtonItem *> *)items animated:(BOOL)animated ;
示列:
//右边第一个 UIButton* rightBt = [UIButton buttonWithType:UIButtonTypeCustom];// [rightBt setBackgroundColor:[UIColor redColor]]; rightBt.frame = CGRectMake(0, 0, 30, 30); [rightBt addTarget:self action:@selector(addEvent) forControlEvents:UIControlEventTouchUpInside]; [rightBt setImage:[UIImage imageNamed:@"addBtn.png"] forState:UIControlStateNormal];// [rightBt setImageEdgeInsets:UIEdgeInsetsMake(0, 0, 0, -20)]; // 向右边拉伸 UIButton* rightBt2 = [UIButton buttonWithType:UIButtonTypeCustom];// [rightBt2 setBackgroundColor:[UIColor yellowColor]]; rightBt2.frame = CGRectMake(0, 0, 20, 19); [rightBt2 addTarget:self action:@selector(toYear) forControlEvents:UIControlEventTouchUpInside]; [rightBt2 setImage:[UIImage imageNamed:@"calendarIcon.png"] forState:UIControlStateNormal]; rightBt2.imageView.contentMode = UIViewContentModeScaleAspectFit;// [rightBt2 setImageEdgeInsets:UIEdgeInsetsMake(0, 0, 0, -35)]; // 向右边拉伸 UIBarButtonItem* rightItem1 = [[UIBarButtonItem alloc] initWithCustomView:rightBt]; UIBarButtonItem* rightItem2 = [[UIBarButtonItem alloc] initWithCustomView:rightBt2]; self.navigationItem.rightBarButtonItems = @[rightItem1, rightItem2];
7、back按钮即有图片,又有“返回”的文字
UIButton *btnb = [UIButton buttonWithType : UIButtonTypeCustom]; btnb.frame = CGRectMake (0, 0, 44, 44); btnb.imageEdgeInsets = UIEdgeInsetsMake(0, -20, 0, 0); [btnb setImage:[UIImage imageNamed:imageName] forState:UIControlStateNormal]; btnb.titleLabel.font=[UIFont boldSystemFontOfSize:14.f]; [btnb setTitle:showName forState:UIControlStateNormal]; [btnb setTitleColor:[UIColor blackColor] forState:UIControlStateNormal]; btnb.showsTouchWhenHighlighted=YES; [btnb addTarget:self action:@selector(showLeft:) forControlEvents:UIControlEventTouchUpInside]; //用到了UIBarButtonItem的initWithCustomView初始化方式 UIBarButtonItem *ubar=[[UIBarButtonItem alloc] initWithCustomView :btnb]; self.navigationItem.leftBarButtonItem = ubar;
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