导航栏图解
标题
self.navigationItem.title=@"注册账号";
导航背景色
self.navigationController.navigationBar.barTintColor=[UIColor redColor];
导航标题的颜色
[self.navigationController.navigationBar setTitleTextAttributes:[NSDictionary dictionaryWithObjectsAndKeys:[UIColor whiteColor],NSForegroundColorAttributeName,nil]];
隐藏导航返回按钮
self.navigationItem.hidesBackButton=YES;
设置返回文字为白色
self.navigationItem.backBarButtonItem.tintColor=[UIColor whiteColor];
把导航的底部当做屏幕的原点开始计算
if ([[[UIDevice currentDevice] systemVersion] floatValue]>=7.0) {
self.navigationController.navigationBar.translucent=NO;//透明度
}
怎么像safari一样滑动的时候隐藏navigationbar?
self.navigationController.hidesBarsOnSwipe = YES;
去掉导航黑线
[self.navigationController.navigationBar setBackgroundImage:[[UIImage alloc] init] forBarMetrics:UIBarMetricsDefault];
self.navigationController.navigationBar.shadowImage = [[UIImage alloc] init];
self.navigationController.navigationBar.tintColor = [UIColor whiteColor];
设置导航模拟全透明导航
[self.navigationController.navigationBar setBackgroundImage:[[UIImage alloc]init] forBarMetrics:UIBarMetricsDefault];self.navigationController.navigationBar.barStyle=UIBarStyleBlackTranslucent;self.navigationController.navigationBar.translucent=YES;
去掉返回按钮上面的文字
[[UIBarButtonItem appearance]setBackButtonTitlePositionAdjustment:UIOffsetMake(0, -60)forBarMetrics:UIBarMetricsDefault];
添加多个导航栏按钮
UIBarButtonItem
*shareItem = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemAction target:self action: nil nil];*
UIBarButtonItemcameraItem = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemCamera target:self action: nil nil];
NSArray *itemsArr = @[shareItem,cameraItem];
self.navigationItem.rightBarButtonItems = itemsArr;
去掉导航下面的一条黑线
self.navigationController.navigationBar.clipsToBounds=YES;
self.automaticallyAdjustsScrollViewInsets=NO;
修改navgationBar的字体的颜色
[self.navigationController.navigationBarsetTitleTextAttributes:[NSDictionarydictionaryWithObjectsAndKeys:[UIColorwhiteColor],NSForegroundColorAttributeName,nil]];
*** 设置背景图***
[navBar setBackgroundImage:[UIImage imageNamed:@"1"] forBarMetrics:0];
//或者设置背景颜色（这两种方法，都可以设置navigationBar上面的image）
navBar.barTintColor=[UIColor yellowColor];
报错为reason: '-[UIButton _setOwningNavigationItem:]
设置自定义导航的时候，或者设置导航上面多个自定义按钮时候，放的对象都必须是UIBarButtonItem。
隐藏导航底部黑线
导航栏渐变效果
//方法一
- (void)scrollViewDidScroll:(UIScrollView *)scrollView
{
CGFloat offsetToShow = 200.0;//滑动多少就完全显示
CGFloat alpha = 1 - (offsetToShow - scrollView.contentOffset.y) / offsetToShow;
[[self.navigationController.navigationBar subviews] objectAtIndex:0].alpha = alpha;
}
//方法二
- (void)scrollViewDidScroll:(UIScrollView *)scrollView
{
CGFloat offsetToShow = 200.0;
CGFloat alpha = 1 - (offsetToShow - scrollView.contentOffset.y) / offsetToShow;
[self.navigationController.navigationBar setShadowImage:[UIImage new]];
[self.navigationController.navigationBar setBackgroundImage:[self imageWithColor:[[UIColor orangeColor]colorWithAlphaComponent:alpha]] forBarMetrics:UIBarMetricsDefault];
}
//生成一张纯色的图片
- (UIImage *)imageWithColor:(UIColor *)color
{
CGRect rect = CGRectMake(0.0f, 0.0f, 1.0f, 1.0f);
UIGraphicsBeginImageContext(rect.size);
CGContextRef context = UIGraphicsGetCurrentContext();
CGContextSetFillColorWithColor(context, [color CGColor]);
CGContextFillRect(context, rect);
UIImage *theImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return theImage;
}
navigationBar变为纯透明
//第一种方法
//导航栏纯透明
//self.navigationController.navigationBar.translucent = YES; 不然该句不起作用（默认为YES）
[self.navigationBar setBackgroundImage:[UIImage new] forBarMetrics:UIBarMetricsDefault];
//去掉导航栏底部的黑线
self.navigationBar.shadowImage = [UIImage new];
//第二种方法
//self.navigationController.navigationBar.translucent = YES; 不然导航变成黑色（默认为YES）
[[self.navigationBar subviews] objectAtIndex:0].alpha = 0;
tabBar变为纯透明
[self.tabBar setBackgroundImage:[UIImage new]];
self.tabBar.shadowImage = [UIImage new];
导航左右按钮的位置调整（右按钮为例）
//所需btnItem
UIButton *button=[UIButton new];//设置内容省略
UIBarButtonItem *rightItem = [[UIBarButtonItem alloc]initWithCustomView:button];
//间隔btnItem
UIBarButtonItem *space = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFixedSpace target:nil action:nil];
space.width = -10;//正负代表两个方向，自己试下。（左正右负）
[self.navigationItem setRightBarButtonItems:[NSArray arrayWithObjects:space,rightItem, nil]];
导航添加多个按钮并调整位置（右侧添加两个按钮为例）
//所需btnItem
UIButton *button1=[UIButton new];//设置内容省略
UIButton *button2=[UIButton new];//设置内容省略
UIBarButtonItem *btnItem1 = [[UIBarButtonItem alloc] initWithCustomView:button1];
UIBarButtonItem *btnItem2 = [[UIBarButtonItem alloc] initWithCustomView:button2];
//间隔btnItem
UIBarButtonItem *space1 = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFixedSpace target:nil action:nil];
space1.width = -10;
UIBarButtonItem *space2 = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFixedSpace target:nil action:nil];
space2.width = -10;
//注意数组中的顺序对应的是导航从右到左的顺序。
self.navigationItem.rightBarButtonItems = @[space1,btnItem1,space2,btnItem2];
自定义导航的titleview
//不能使用addSubview
// [self.navigationItem.titleView addSubview:titlesView];
self.navigationItem.titleView = titlesView;
//方式一：
// self.navigationItem.titleView = self.menuScreeningView;
//方式二：（这样添加，离开该界面的时候要手动移除。）
[self.navigationController.navigationBar addSubview:titlesView];
}
-(void)viewWillAppear:(BOOL)animated
{
[super viewWillAppear:animated];
//移除导航上面的下拉列表
[titlesView removeFromSuperview];
}
设置导航的背景图拉伸
UIImage * img= [UIImage imageNamed:@"shy_bj"];
img = [img stretchableImageWithLeftCapWidth:1 topCapHeight:1];
//导航背景
[self.navigationController.navigationBar setBackgroundImage:img forBarMetrics:UIBarMetricsDefault];
设置导航的背景图拉伸
导航左边返回按钮点击范围很大的解决方案
// 左边按钮
UIButton *leftbut =[UIButton buttonWithType:UIButtonTypeCustom];
[leftbut setImage:[UIImage imageNamed:@"btn_left"] forState:UIControlStateNormal];
[leftbut addTarget:self action:@selector(ClicknavleftBut) forControlEvents:UIControlEventTouchUpInside];
[leftbut sizeToFit];
//把返回按钮放在一个view上面，然后添加到导航上，不然返回的范围很大。
UIView *leftView = [UIView new];
leftView.frame= leftbut.frame;
[leftView addSubview:leftbut];
self.navigationItem.leftBarButtonItem =[[UIBarButtonItem alloc] initWithCustomView:leftView];
