Objective c UIPickerView和UITextFields问题
我有多个文本字段。在其中一个示例中,我想显示一个UIPickerView。 我是这样做的:Objective c UIPickerView和UITextFields问题,objective-c,uitextfield,uipickerview,Objective C,Uitextfield,Uipickerview,我有多个文本字段。在其中一个示例中,我想显示一个UIPickerView。 我是这样做的: -(void)showPicker{ [subject becomeFirstResponder]; actionSheet = [[UIActionSheet alloc] initWithTitle:nil delegate:nil
-(void)showPicker{
[subject becomeFirstResponder];
actionSheet = [[UIActionSheet alloc] initWithTitle:nil
delegate:nil
cancelButtonTitle:nil
destructiveButtonTitle:nil
otherButtonTitles:nil];
[actionSheet setActionSheetStyle:UIActionSheetStyleBlackTranslucent];
CGRect pickerFrame = CGRectMake(0, 40, 0, 0);
picker = [[UIPickerView alloc] initWithFrame:pickerFrame];
picker.showsSelectionIndicator = YES;
picker.dataSource = self;
picker.delegate = self;
[actionSheet addSubview:picker];
[picker release];
UISegmentedControl *closeButton = [[UISegmentedControl alloc] initWithItems: [NSArray arrayWithObject:@"Close"]];
closeButton.momentary = YES;
closeButton.frame = CGRectMake(260, 7.0f, 50.0f, 30.0f);
closeButton.segmentedControlStyle = UISegmentedControlStyleBar;
closeButton.tintColor = [UIColor blackColor];
[closeButton addTarget:self action:@selector(dismissActionSheet) forControlEvents:UIControlEventValueChanged];
[actionSheet addSubview:closeButton];
[closeButton release];
[actionSheet showInView:[[UIApplication sharedApplication] keyWindow]];
[actionSheet setBounds:CGRectMake(0, 0, 320, 485)];
}
-(void)dismissActionSheet{
[actionSheet dismissWithClickedButtonIndex:0 animated:YES];
}
当我关闭它时,工作表将被取消,但主题
文本字段上的键盘将出现
现在:
我如何才能不显示主题
文本字段上的键盘
这里是我放弃键盘的地方:
- (void) resignKeyboard:(id)sender{
if ([name isFirstResponder])
[name resignFirstResponder];
else if ([email isFirstResponder])
[email resignFirstResponder];
else if ([message isFirstResponder])
[message resignFirstResponder];
else if ([subject isFirstResponder]) {
[subject resignFirstResponder];
}
}
可以防止键盘弹出 首先将您的类设置为UITexfield的委托
textField.delegate = self
在接口声明中添加:
<UITextFieldDelegate>
使用UItextField委托:为此,您需要添加@interface YourViewController:UIViewController 如果UItextField是通过右键单击从xib获取的,请将其委托添加到fileowner 现在在代码中使用此方法:
- (BOOL)textFieldShouldBeginEditing:(UITextField *)textField
{
if(textField == subject)
{
return NO;
}
return YES;
}
解决方法是使用一个透明按钮来处理显示选择器的操作。“subject”文本字段已禁用。我已经在使用UITextField委托,但它无论如何都不起作用:\n添加此方法并告诉它是如何进行的没有发生,键盘保持显示检查此方法是否通过调试调用如果不再次读取我的答案,我认为它没有调用,因为我使用了选择器(所以我们可以说文本字段“subject”就像一个按钮)这种情况是否只发生在“subject”上textField?subject字段是包含UIPickerView的字段。当我关闭它时,键盘会出现,它不应该看这个问题:一个方便的子类来完成这个任务:我实际上是通过选择器显示UIPickerView:
[subject addTarget:self action:@selector(showPicker)forControlEvents:uicontrolEventEditingDidBegen];
- (BOOL)textFieldShouldBeginEditing:(UITextField *)textField
{
if(textField == subject)
{
return NO;
}
return YES;
}