添加上一个和下一个按钮到我的UIPicker的辅助视图？

Question

在我的视图控制器我有5个文本字段，4成为第一响应者与键盘和一个与UIPicker，他们都被标记+1（0,1,2 ...）

它恰好如此，成为Picker的第一响应者的textfield是3号，所以它卡在中间。在我的其他领域，我有我的代码设置，以便“下一步”返回按钮将我带到我的下一个字段，但是我一直无法使用选取器取得同样的结果，导致发生这种情况的代码：

-(BOOL) textFieldShouldReturn:(UITextField *) theTextField { 
    if (theTextField == self.textFieldE) {  
     [theTextField resignFirstResponder]; //This of course being the last text field 
    } else { 
     [(UITextField *)[theTextField.superview viewWithTag:theTextField.tag+1] 
     becomeFirstResponder]; 
    } 
    return YES; 
} 

UIPickerView有一个附件视图附加到一个完成按钮，事实上resignFirstResponder，但我需要能够添加prev和下一个按钮，使firstResponder -1.tag或+ 1.tag，因为选择器卡在位置编号3

这是我的选择器代码：

- (void)textFieldDidBeginEditing:(UITextField *)textField { 

    if (textField == self.textOutlet) { 

     self.textOutlet.inputView = _thePicker; 
     self.thePicker.hidden = NO; 

     UIToolbar* toolbar = [[UIToolbar alloc] init]; 
     toolbar.barStyle = UIBarStyleBlackTranslucent; 
     [toolbar sizeToFit]; 

     //to make the done button aligned to the right 
     UIBarButtonItem *flexibleSpaceLeft = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFlexibleSpace target:nil action:nil]; 


     UIBarButtonItem* doneButton = [[UIBarButtonItem alloc] initWithTitle:@"Done" 
                     style:UIBarButtonItemStyleDone target:self 
                     action:@selector(doneClicked:)]; 


     [toolbar setItems:[NSArray arrayWithObjects:flexibleSpaceLeft, doneButton, nil]]; 

     self.textOutlet.inputAccessoryView = toolbar; 
    } 

    } 

，当然还有“完成”按钮的作用：

-(void)doneClicked:(id) sender 
{ 
    [_textOutlet resignFirstResponder]; //hides the pickerView 
} 

感谢提前的帮助！

Answer 1

试试看看这个代码。它应该如你所愿地工作。

#define SEGMENTED_CONTROL_TAG 1567 // random 

- (void)textFieldDidBeginEditing:(UITextField *)textField { 

    if (textField == self.textOutlet) { 

     self.textOutlet.inputView = _thePicker; 
     self.thePicker.hidden = NO; 

     UIToolbar* toolbar = [[UIToolbar alloc] init]; 
     toolbar.barStyle = UIBarStyleBlackTranslucent; 
     [toolbar sizeToFit]; 

     UISegmentedControl *segmentedControl = [[UISegmentedControl alloc] initWithItems:[NSArray arrayWithObjects:@"Previous", @"Next", nil]]; 
     segmentedControl.tag = theTextField.tag + SEGMENTED_CONTROL_TAG; 
     [segmentedControl addTarget:self action:@selector(textFieldContinue:) forControlEvents:UIControlEventValueChanged]; 

     //to make the done button aligned to the right 
     UIBarButtonItem *flexibleSpaceLeft = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFlexibleSpace target:nil action:nil]; 


     UIBarButtonItem* doneButton = [[UIBarButtonItem alloc] initWithTitle:@"Done" 
                     style:UIBarButtonItemStyleDone target:self 
                     action:@selector(doneClicked:)]; 


     [toolbar setItems:@[segmentedControl,flexibleSpaceLeft, doneButton]]; 

     self.textOutlet.inputAccessoryView = toolbar; 
    } 

} 


-(IBAction) textFieldContinue:(UISegmentedControl*)control{ 
    UITextField *textField; 
    if(control.selectedSegmentIndex == 0) { 
     textField = (UITextField*)[self.view viewWithTag:control.tag-1 - SEGMENTED_CONTROL_TAG]; 
    } else if (control.selectedSegmentIndex == 1) { 
     textField = (UITextField*)[self.view viewWithTag:control.tag+1 - SEGMENTED_CONTROL_TAG]; 
    } 
    if(textField) { 
     [textField becomeFirstResponder]; 
    } 
}