ios - 带有文本字段的 uipickerview 在 textFieldShouldBeginEditing 之后未被调用

Question

我正在使用 UIPickerViewDataSource, UIPickerViewDelegate我正在使用 countrypickerview 创建一个 countrytxtfield 并且我能够将一些静态数据传递给 countrypickerview 并且它工作正常。

但是当我尝试从服务响应中获取数据时，我在 connectionDidFinishLoading 中调用相同的 countrypickerview 但它没有被调用

据我所知

我正在通过 textFieldShouldBeginEditing 方法检测 countrytxtfield 的点击

我正在调用一个方法

[self addPickerViewCountry];

其中包含 countrytextfield 和 countrypickerview 详细信息

如果我将此方法放在 textFieldShouldBeginEditing 中 countrypickerview 被调用并且我可以看到数据，如果将相同的方法放在 textFieldShouldBeginEditing 之后和connectionDidFinishLoading 我看不到 countrypickerview

我认为 textFieldShouldBeginEditing 造成了问题。

这可能是我无法理解的简单应用逻辑。下面是我创建 countrypickerview 的代码以及我调用它的时间

viewcontroller.h文件

UIPickerView *myPickerViewCountry;
NSArray *pickerArrayCountry;

@property (weak, nonatomic) IBOutlet UITextField *country;

viewcontroller.m
- (BOOL)textFieldShouldBeginEditing:(UITextField *)textField
{



if( textField == _country ) {
    [textField resignFirstResponder];

    NSString *refidUser =[[NSUserDefaults standardUserDefaults]
                          stringForKey:@"refidUser"];
    NSLog(@"id %@",refidUser);

    NSString *editProfURL = editProfileDetails;

    NSURL *url = [NSURL URLWithString:editProfURL];



    NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];
    [request setHTTPMethod:@"POST"];
    // NSData *requestBody = [@"UserName=%@,username&Password=%@,password" dataUsingEncoding:NSUTF8StringEncoding];
    NSString *requestBody =[[NSString alloc] initWithFormat:@"UserId=%@",refidUser];

    NSData *requestBodyy = [requestBody dataUsingEncoding:NSUTF8StringEncoding];
    [request setHTTPBody:requestBodyy];
    NSURLResponse *response = NULL;
    NSError *requestError = NULL;   
}
  return YES;
  }

- (void)connectionDidFinishLoading:(NSURLConnection *)connection {
[self addPickerViewCountry];
}

  -(void)addPickerViewCountry{

  pickerArrayCountry =  [[NSArray alloc]initWithObjects:@"India",
  @"India",@"India",@"India", nil];

  // pickerArrayCountry = countryNameArr;
   NSLog(@"countryarr %@",countryNameArr);
  NSLog(@"pickerarrat %@",pickerArrayCountry);
  myPickerViewCountry = [[UIPickerView alloc]init];
  myPickerViewCountry.dataSource = self;
  myPickerViewCountry.delegate = self;
  myPickerViewCountry.showsSelectionIndicator = YES;

   UIBarButtonItem *barButtonDone = [[UIBarButtonItem alloc]   initWithTitle:@"Done"
                                                                       style:UIBarButtonItemStyleBordered target:self action:@selector(doneCountry:)];

UIToolbar *toolBar = [[UIToolbar alloc]initWithFrame:
                      CGRectMake(0, self.view.frame.size.height-
                                 myPickerViewCountry.frame.size.height-50, 320, 30)];
[toolBar setBarStyle:UIBarStyleBlackOpaque];
NSArray *toolbarItems = [NSArray arrayWithObjects:
                         barButtonDone, nil];
[toolBar setItems:toolbarItems];
_country.inputView = myPickerViewCountry;
_country.inputAccessoryView = toolBar;
 }

如果我在

中调用 [self addPickerViewCountry]方法

 - (BOOL)textFieldShouldBeginEditing:(UITextField *)textField
{
[self addPickerViewCountry];
 }

我能够看到 UIPickerView，如果我在 connectionDidFinishLoading 中调用它，我将看不到 UIPickerView。任何人都可以建议我问题出在哪里？

Answer 1

你在哪里添加了myPickerViewCountry，比如[self.view addSubview: myPickerViewCountry]？另一件事是你继续分配新的 UIPickerView..

我觉得这样比较合适:

if (myPickerViewCountry == nil)
{
  myPickerViewCountry = [[UIPickerView alloc]init];
  myPickerViewCountry.dataSource = self;
  myPickerViewCountry.delegate = self;
  myPickerViewCountry.showsSelectionIndicator = YES;
}

关于你的问题:你没有为你的设置框架

myPickerViewCountry = [[UIPickerView alloc]init];

尝试设置如下:

myPickerViewCountry = [[UIPickerView alloc] initWithFrame:CGRectMake(0, 0, 150, 150)];

嗯..这就是我认为是错误的..