iOS 从app跳转到Safari、从app打开电话呼叫

1.从app跳转到Safari

 NSString* strIdentifier = @"http://www.ybyb.com";

             BOOL isExsit = [[UIApplication sharedApplication] canOpenURL:[NSURL URLWithString:strIdentifier]];

             if(isExsit) {

                 NSLog(@"App %@ installed", strIdentifier);

                 [[UIApplication sharedApplication] openURL:[NSURL URLWithString:strIdentifier]];

             }

2.从app打开电话呼叫

  NSString *phoneNum = @"";// 电话号码

         UIWebView *phoneCallWebView;

         NSURL *phoneURL = [NSURL URLWithString:[NSString stringWithFormat:@"tel:%@",phoneNum]];

          if ( !phoneCallWebView ) {

         phoneCallWebView = [[UIWebView alloc] initWithFrame:CGRectZero];// 这个webView只是一个后台的View 不需要add到页面上来

              }

         [phoneCallWebView loadRequest:[NSURLRequest requestWithURL:phoneURL]];

         [self.view addSubview:phoneCallWebView];