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];