iOS拨打电话

NSMutableString *str=[[NSMutableString alloc]initWithFormat:@"18514697034"];
    UIAlertController *alertController = [UIAlertController alertControllerWithTitle:nil
                                                                             message:str
                                                                      preferredStyle:UIAlertControllerStyleAlert];
                          
    UIAlertAction *cancelAction = [UIAlertAction actionWithTitle:@"取消"
                                                           style:UIAlertActionStyleCancel
                                                         handler:^(UIAlertAction *action) {
        
    }];
                          
    UIAlertAction *otherAction = [UIAlertAction actionWithTitle:@"拨打"
                                                          style:UIAlertActionStyleDefault
                                                        handler:^(UIAlertAction *action) {
        [[UIApplication sharedApplication] openURL:[NSURL URLWithString:str]];
    }];
                          
                          // Add the actions.
    [alertController addAction:cancelAction];
    [alertController addAction:otherAction];
    [self presentViewController:alertController
                       animated:YES completion:nil];

这种方法应该是体验比较好的一种，比较流畅