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一，在iOS开发过程中针对一些导航栏上需要自定义视图的情况，有时候需要用系统自带的处理，有些时候需要自定义一些视图并把视图添加上去，这时候主要是它们的位置有些许差别，下面简单写下demo；
1，用导航栏系统自带的视图处理：
1 //1 中间的图片 2 UIImageView *imageBarView = [[UIImageView alloc] initWithFrame:CGRectMake(kScreenWidth / 2.f - 40.f, 20.f, 80, 30)]; 3 imageBarView.image = [UIImage imageNamed:@"中间视图名称"]; 4 self.navigationItem.titleView = imageBarView; 5 6 7 //2 导航栏右边的分类按钮 8 UIButton *buttonRightItem = [UIButton buttonWithType:UIButtonTypeCustom]; 9 buttonRightItem.frame = CGRectMake(0.f, 0.f, 50.f, 30.f); 10 [buttonRightItem setTitle:@"分类" forState:UIControlStateNormal]; 11 [buttonRightItem setTitleColor:[UIColor colorWithRed:0.310 green:0.598 blue:0.156 alpha:1.000] forState:UIControlStateNormal]; 12 buttonRightItem.titleLabel.font = [UIFont systemFontOfSize:17]; 13 [buttonRightItem addTarget:self action:@selector(buttonRightAction:) forControlEvents:UIControlEventTouchUpInside]; 14 self.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc] initWithCustomView:buttonRightItem]; 15 16 //3 导航栏左侧的APP按钮 17 UIButton *buttonLeftItem = [UIButton buttonWithType:UIButtonTypeCustom]; 18 buttonLeftItem.frame = CGRectMake(0.f, 0.f, 64.f, 64.f); 19 [buttonLeftItem setImage:[UIImage imageNamed:@"左侧视图"] forState:UIControlStateNormal]; 20 buttonLeftItem.imageEdgeInsets = UIEdgeInsetsMake(0.f, -30.f, 0.f, 0.f);//用来调节相对位置 21 [buttonLeftItem addTarget:self action:@selector(buttonLeftAction:) forControlEvents:UIControlEventTouchUpInside]; 22 self.navigationItem.leftBarButtonItem = [[UIBarButtonItem alloc] initWithCustomView:buttonLeftItem];
其实以上关键是：
self.navigationItem.titleView = imageBarView;
self.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc] initWithCustomView:buttonRightItem];
self.navigationItem.leftBarButtonItem = [[UIBarButtonItem alloc] initWithCustomView:buttonLeftItem];
主要是上面的三句话，这个优点是左，中，右三个按钮的响应事件的区域比较大，比较容易调控，一般建议用系统自带的来操作；
缺点也有，就是每个区域只能放一个控件，下面用自定义的方法来在同一个区域放两个或以上的控件；
2，自定义导航栏上的视图；
1 rightButton = [UIButton buttonWithType:UIButtonTypeCustom]; 2 rightButton.backgroundColor = [UIColor blackColor]; 3 [rightButton setTitle:@"分享" forState:UIControlStateNormal]; 4 [rightButton addTarget:self action:@selector(shareAction:) forControlEvents:UIControlEventTouchUpInside]; 5 rightButton.frame = CGRectMake(self.view.width - 50.f,0.f, 50.f, 44.f); 6 [self.navigationController.navigationBar addSubview:rightButton]; 7 8 rightTwoButton = [UIButton buttonWithType:UIButtonTypeCustom]; 9 rightTwoButton.backgroundColor = [UIColor blueColor]; 10 [rightTwoButton setTitle:@"收藏" forState:UIControlStateNormal]; 11 [rightTwoButton addTarget:self action:@selector(storeAction:) forControlEvents:UIControlEventTouchUpInside]; 12 rightTwoButton.frame = CGRectMake(self.view.width - 100.f, 0.f, 50.f, 44.f); 13 [self.navigationController.navigationBar addSubview:rightTwoButton];
以上方法可以把视图很任性的放在导航栏的任何位置，因为用的是 self.navigationController.navigationBar 来添加的，这个是代表整个导航栏，但是这个的frame需要认真调节，不然的话布局会很难看，除此之外，当当起视图要出现或者消失时还需要对这个按钮进行处理；
1 - (void)viewWillDisappear:(BOOL)animated 2 { 3 [super viewWillDisappear:animated]; 4 5 [UIView animateWithDuration:0.2 animations:^{ 6 7 rightButton.alpha = 0; 8 rightTwoButton.alpha = 0; 9 10 }]; 11 } 12 13 - (void)viewWillAppear:(BOOL)animated{ 14 15 [super viewWillAppear:animated]; 16 [UIView animateWithDuration:0.2 animations:^{ 17 18 rightButton.alpha = 1; 19 rightTwoButton.alpha = 1; 20 21 }]; 22 23 }
以上就是导航栏上视图的处理，可能比较简单，但是对初学者来说也是比较重要的；
小技巧：消除导航栏下方的阴影办法：
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原文地址：http://www.cnblogs.com/RiversMa/p/4725735.html
