iOS开发之NavBar和TarBar使用技巧

1 改变NavBar颜色:选中Navigation Bar 的Tint属性。选中颜色。

2 隐藏“back”按钮: self.navigationItem.hidesBackButton = YES;

3 隐藏”NavBar” : self.navigationController.navigationBarHidden = YES;

4 可以不用MainWindow.xib创建的Navigation。在每个view上自定义。

需要把每个控制页都加上以下代码来隐藏nav:

-(void)viewWillAppear:(BOOL)animated
{
self.navigationController.navigationBarHidden = YES;//显示"NavBar"
}

然后在每个控制页xib自己添加Navigation Bar。添加所需BarButtonItem按钮。

5 页面跳转隐藏tarbar :

HomeDetailViewController *detailview = [[HomeDetailViewController alloc] initWithNibName:@"HomeDetailView" bundle:nil];  
detailview.hidesBottomBarWhenPushed = YES;//隐藏tarbar  
[self.navigationController pushViewController:detailview animated:YES];  
[detailview     release];

6 页面返回:

[self.navigationController popViewControllerAnimated:YES];

7 默认选中tabbar为第一个view:

TabBarController.selectedIndex= 0;

其他:

8 已知两地经纬度 计算两地之间的距离:  
//    地图显示当前位置:  
    mapView.showsUserLocation=YES;  
    CLLocationManager *locationManager = [[CLLocationManager alloc] init];//创建位置管理器  
    locationManager.delegate=self;//设置代理  
    locationManager.desiredAccuracy=kCLLocationAccuracyBest;//指定需要的精度级别为最佳精度  
    locationManager.distanceFilter=1000.0f;//设置距离筛选器为任何移动都要发送更新  
    [locationManager startUpdatingLocation];//启动位置管理器  
    MKCoordinateSpan theSpan;  
    //地图的范围 越小越精确  
    theSpan.latitudeDelta=0.05;  
    theSpan.longitudeDelta=0.05;  
    MKCoordinateRegion theRegion;  
    theRegion.center=[[locationManager location] coordinate];  
    theRegion.span=theSpan;  
    [mapView setRegion:theRegion];  
    [locationManager release];  

    MKUserLocation *usrLoc=mapView.userLocation;  
    CLLocationCoordinate2D usrCoordinate=usrLoc.location.coordinate;  
    NSLog(@"la==%f lo==%f",usrCoordinate.latitude,usrCoordinate.longitude);  

//   已知两点的经纬度,计算出两地距离:  
    CLLocation *location1 = [[[CLLocation alloc] initWithLatitude:usrCoordinate.latitude longitude:usrCoordinate.longitude] autorelease];  
    CLLocation *location2 = [[[CLLocation alloc] initWithLatitude:36.676445 longitude:117.106793] autorelease]; 
    NSLog(@"JULI====%.0f km", [location1 distanceFromLocation:location2]);//4502

澳门新葡亰3522平台游戏,9 取小数点后两位(四舍五入),输出:

NSLog(@”%.02f km”,4478.442312);

10 调用打电话API :

[[UIApplication sharedApplication] openURL:[NSURL
URLWithString:@”tel://10010″]];

使用这种方式拨打电话时,当用户结束通话后,iphone界面会停留在电话界面。

用如下方式,可以使得用户结束通话后自动返回到应用:

UIWebView*callWebview =[[UIWebView alloc] init];  
    NSURL *telURL =[NSURL URLWithString:@"tel:10086"];// 貌似tel:// 或者 tel: 都行  
    [callWebview loadRequest:[NSURLRequest requestWithURL:telURL]];  
    //记得添加到view上  
    [self.view addSubview:callWebview];

11 调用 SMS发短信:

[[UIApplication sharedApplication] openURL:[NSURL
URLWithString:@”sms://15315310992″]];

12 调用自带 浏览器 safari

[[UIApplication sharedApplication] openURL:[NSURL
URLWithString:@”];

13 在一个程序里打开另一个程序:

首先:plist里添加URL types   点开里边的Item0  添加URLSchemes  打开Item0
输入sinaWeibo

然后在需要调用的地方:[[UIApplication sharedApplication]
openURL:[NSURL URLWithString:@”sinaWeibo://*”]];

14 双引号转义:

用 ” 表示 双引号

15 设置按钮按下换图片 松开还是原图

//                [danxuan setImage:[UIImage imageNamed:@"exercise_option_n.png"] forState:UIControlStateNormal];  
                //这个是设置按下的图片,松开就是上面的图片  
//               [danxuan setImage:[UIImage imageNamed:@"exercise_option_s.png"] forState:UIControlEventTouchDragOutside];

16  判断数组中是否存在某元素:

BOOL isValue=[keyArray containsObject:@”aaa”];

17 Nav添加button

UIButton *btnBack = [ABUtil createNavigationCtrollerRoundedRectBtn:Localized(@"取消")];  
    [btnBack addTarget:self  
                action:@selector(tapLeftBarButton)  
      forControlEvents:UIControlEventTouchUpInside];  
    UIBarButtonItem *leftBarButtonItem = [[UIBarButtonItem alloc] initWithCustomView:btnBack];  
    self.navigationItem.leftBarButtonItem = leftBarButtonItem;  
    [btnBack release];  
    [leftBarButtonItem release]