當上傳數據到Parse.com時，UIAlertView似乎凍結應用程序

Question

你好我正在使用分析來幫助我的iOS應用程序的後端，並且我創建了一個按鈕，可以將我的文本保存在我的文本字段中，並將其上傳到雲中點擊一個按鈕。

的按鈕，並在彈出的警告的代碼如下

- (IBAction)savebutton:(id)sender { 
// Create PFObject with recipe information 
PFObject *recipe = [PFObject objectWithClassName:@"GolfTimes"]; 
[recipe setObject:_nameTextField.text forKey:@"Name"]; 
[recipe setObject:_prepTimeTextField.text forKey:@"MemberNumber"]; 

[recipe setObject:_NumberOfGolfers.text forKey:@"NumberOfGolfers"]; 

[recipe setObject:_RequestedTime.text forKey:@"RequestedTime"]; 


NSArray *ingredients = [_ingredientsTextField.text componentsSeparatedByString: @","]; 
[recipe setObject:ingredients forKey:@"Telephone"]; 

// Show progress 
MBProgressHUD *hud = [MBProgressHUD showHUDAddedTo:self.view animated:YES]; 
hud.mode = MBProgressHUDModeIndeterminate; 
hud.labelText = @"Sending..."; 
[hud show:YES]; 

// Upload recipe to Parse 
[recipe saveInBackgroundWithBlock:^(BOOL succeeded, NSError *error) { 
    [hud hide:NO]; 

    if (!error) { 
     // Show success message 
     UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Request Sent" message:@"We will get back to you with confirmation." delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil, nil]; 
     [alert show]; 

     // Notify table view to reload the recipes from Parse cloud 
     [[NSNotificationCenter defaultCenter] postNotificationName:@"refreshTable" object:self]; 

     // Dismiss the controller 
     [self dismissViewControllerAnimated:YES completion:nil]; 

    } else { 
     UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Upload Failure" message:[error localizedDescription] delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil, nil]; 
     [alert show]; 

    } 

}];} 

雖然數據併發送正確的和我把它做的視圖控制器不關閉，警報似乎凍結應用我大部分時間都無法點擊「確定」。當我點擊「確定」按鈕時，應用模擬器關閉。

任何建議或幫助？

Answer 1

我相信你需要的UIAlertView分派到主線程像這樣當你要告訴他們：編輯：你不能有UIAlertView的代表是在UIViewController你剛剛被解僱！這就是它崩潰的原因。將代理設置爲：nil應該修復該問題。

dispatch_async(dispatch_get_main_queue(),^ 
{ 
    UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Request Sent" message:@"We will get back to you with confirmation." delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil, nil]; 
    [alert show]; 

    [[NSNotificationCenter defaultCenter] postNotificationName:@"refreshTable" object:self]; 

    [self dismissViewControllerAnimated:YES completion:nil]; 
});