小编Dan*_*man的帖子

我有以下代码:

-(IBAction)showAlertView:(id)sender{

alertView = [[UIAlertView alloc] initWithTitle:@"Atualizando" message:@"\n"delegate:self cancelButtonTitle:nil otherButtonTitles:nil];

spinner = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleWhiteLarge];   
spinner.center = CGPointMake(139.5, 75.5); // .5 so it doesn't blur
[alertView addSubview:spinner];
[spinner startAnimating];
[alertView show]; 
}


-(IBAction)getContacts:(id)sender {

[self showAlertView:(id)self];

ABAddressBookRef addressBook = ABAddressBookCreate( );
CFArrayRef allPeople = ABAddressBookCopyArrayOfAllPeople( addressBook );
CFIndex nPeople = ABAddressBookGetPersonCount( addressBook );

我希望在IBAction的其余部分开始之前显示警报,但我只在IBAction结束时看到alertView.我究竟做错了什么？

编辑:我有:

-(IBAction)getContacts:(id)sender {

// display the alert view
[self showAlertView:self];

// do the synchronous operation on a different queue
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{

ABAddressBookRef addressBook = …

我正在尝试将以下代码与gomobile绑定，以将其导出为iOS框架。我已经成功完成了此操作，但是由于某种原因，以下代码在运行bind命令时给我错误gomobile：包中没有导出的名称。该代码作为go脚本运行时有效。

   package request

import (
    "net/url"
    "fmt"
)

func requestEndpoint(number string) string {

    safeNumber := url.QueryEscape(number)
  url := fmt.Sprintf("http://apilayer.net/api/validate?access_key=690a581e85900555754fd7bfa70808b2&number=%s&country_code=&format=1", safeNumber)


   return url

  }

有任何想法吗？谢谢！