我正在创建一个iOS应用程序，要求用户为多个文本字段输入数值。在UITextField属性下，我使用了
键盘 =十进制键
返回键 =完成
键盘占用空间并隐藏＆＃34;提交表格＆＃34;按钮。
在 UIViewController.h 文件下，我为每个UITextField编写了以下代码，事件为在退出时结束：
-(IBAction)dismissKeyboard:(id)sender;
在 UIViewController.m 文件下，我为每个UITextField编写了以下代码：
-(IBAction)dismissKeyboard:(id)sender {
[textField becomeFirstResponder];
[textField resignFirstResponder];
}
当我为Xcode 5打开iOS模拟器时，我在屏幕键盘上没有任何 DONE 字段。但是，如果我从MacBook键盘按RETURN键，屏幕键盘就会消失。
我怎么能 -
答案 0 :(得分：8)
由于建议滚动视图，我将推荐另一种方法。
对于每个数字输入字段，设置输入附件视图 - 工具栏 - 其中包含“完成”按钮。它看起来像Safari中键盘上方的条形图。用户点击此完成按钮后，像往常一样关闭键盘。
这是最简单的解决方案。
UIToolbar* toolbar = [UIToolbar new];
UIBarButtonItem* doneButton = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemDone target:self action:@selector(dismissKeyboard:)];
id space = [UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFlexibleSpace target:nil action:NULL];
toolbar.items = @[space, doneButton];
self.numericTextField1.inputAccessoryView = toolbar;
self.numericTextField2.inputAccessoryView = toolbar;
...
答案 1 :(得分：2)
在.h类中，首先声明一个滚动视图。
@property (strong, nonatomic) IBOutlet UIScrollView *scrRegistration;
在.m类中，使用这些代码
-(void)viewWillAppear:(BOOL)animated
{
UITapGestureRecognizer *gesture = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(hideKeyboard:)];
[gesture setNumberOfTapsRequired:1];
[gesture setNumberOfTouchesRequired:1];
[self.scrRegistration addGestureRecognizer:gesture];
[self.scrRegistration setContentSize:CGSizeMake(320, 354)];
for (UIView *vw in [self.scrRegistration subviews]) {
if([vw isKindOfClass:[UITextField class]]){
UITextField *txtfld=(UITextField *)vw;
txtfld.attributedPlaceholder = [[NSAttributedString alloc] initWithString:txtfld.placeholder attributes:@{NSForegroundColorAttributeName: [UIColor colorWithRed:8.0f/255.0f green:94.0f/255.0f blue:165.0f/255.0f alpha:1.0]}];
}
}
}
- (BOOL)textFieldShouldBeginEditing:(UITextField *)textField
{
if(textField==DecimalKeyboard) {
if([[UIScreen mainScreen] bounds].size.height>480) {
[self.scrRegistration setContentOffset:CGPointMake(0, 110) animated:YES];
} else {
[self.scrRegistration setContentOffset:CGPointMake(0, 300) animated:YES];
}
UIToolbar* numberToolbar = [[UIToolbar alloc]initWithFrame:CGRectMake(0, 0, 320, 50)];
numberToolbar.barStyle = UIBarStyleBlackTranslucent;
numberToolbar.items = [NSArray arrayWithObjects:
[[UIBarButtonItem alloc]initWithTitle:@"Cancel" style:UIBarButtonItemStyleBordered target:self action:@selector(cancelNumberPad)],
[[UIBarButtonItem alloc]initWithBarButtonSystemItem:UIBarButtonSystemItemFlexibleSpace target:nil action:nil],
[[UIBarButtonItem alloc]initWithTitle:@"Done" style:UIBarButtonItemStyleDone target:self action:@selector(doneWithNumberPad)],
nil];
[numberToolbar sizeToFit];
textField.inputAccessoryView = numberToolbar;
}
}
-(void)hideKeyboard:(UITapGestureRecognizer *)tap
{
[DecimalKeyboard resignFirstResponder];
[self.scrRegistration setContentOffset:CGPointMake(0, 0) animated:YES];
[UIView beginAnimations:nil context:NULL];
[UIView setAnimationDuration:0.35];
[UIView setAnimationCurve:UIViewAnimationCurveEaseOut];
[UIView commitAnimations];
}
-(void)cancelNumberPad
{
for (UIView *vw in [self.scrRegistration subviews]) {
if([vw isKindOfClass:[UITextField class]]) {
UITextField *txtfld=(UITextField *)vw;
if ([txtfld isFirstResponder] == YES) {
[txtfld resignFirstResponder];
}
}
}
[self.scrRegistration setContentOffset:CGPointMake(0, 0) animated:YES];
[UIView beginAnimations:nil context:NULL];
[UIView setAnimationDuration:0.35];
[UIView setAnimationCurve:UIViewAnimationCurveEaseOut];
[UIView commitAnimations];
}
-(void)doneWithNumberPad
{
[DecimalKeyboard resignFirstResponder];
[self.scrRegistration setContentOffset:CGPointMake(0, 0) animated:YES];
[UIView beginAnimations:nil context:NULL];
[UIView setAnimationDuration:0.35];
[UIView setAnimationCurve:UIViewAnimationCurveEaseOut];
[UIView commitAnimations];
}
答案 2 :(得分：1)
您可能最好只是将屏幕上的内容放入滚动视图，然后在键盘存在时调整视图大小。这通常是我在输入表单时采用的方法，并且它非常容易实现。为此，您可以按照以下答案中的说明进行操作：
https://stackoverflow.com/a/16044603/3708242
首先，确保为键盘通知注册viewController（并在视图消失时删除观察者）：
- (void)viewWillAppear:(BOOL)animated
{
[super viewWillAppear:animated];
// register for keyboard notifications
[[NSNotificationCenter defaultCenter] addObserver:self
selector:@selector(keyboardWillShow)
name:UIKeyboardWillShowNotification
object:nil];
[[NSNotificationCenter defaultCenter] addObserver:self
selector:@selector(keyboardWillHide)
name:UIKeyboardWillHideNotification
object:nil];
}
- (void)viewWillDisappear:(BOOL)animated
{
[super viewWillDisappear:animated];
// unregister for keyboard notifications while not visible.
[[NSNotificationCenter defaultCenter] removeObserver:self
name:UIKeyboardWillShowNotification
object:nil];
[[NSNotificationCenter defaultCenter] removeObserver:self
name:UIKeyboardWillHideNotification
object:nil];
}
这是代码的主要部分。它假设您有一个占据整个屏幕的视图。如果情况并非如此，您需要通过以下两种方法调整CGRect：。
- (void)keyboardWillShow:(NSNotification *)note {
NSDictionary *userInfo = note.userInfo;
NSTimeInterval duration = [userInfo[UIKeyboardAnimationDurationUserInfoKey] doubleValue];
UIViewAnimationCurve curve = [userInfo[UIKeyboardAnimationCurveUserInfoKey] integerValue];
CGRect keyboardFrameEnd = [userInfo[UIKeyboardFrameEndUserInfoKey] CGRectValue];
keyboardFrameEnd = [self.view convertRect:keyboardFrameEnd fromView:nil];
[UIView animateWithDuration:duration delay:0 options:UIViewAnimationOptionBeginFromCurrentState | curve animations:^{
self.contentView.frame = CGRectMake(0, 0, keyboardFrameEnd.size.width, keyboardFrameEnd.origin.y);
} completion:nil];
}
- (void)keyboardWillHide:(NSNotification *)note {
NSDictionary *userInfo = note.userInfo;
NSTimeInterval duration = [userInfo[UIKeyboardAnimationDurationUserInfoKey] doubleValue];
UIViewAnimationCurve curve = [userInfo[UIKeyboardAnimationCurveUserInfoKey] integerValue];
CGRect keyboardFrameEnd = [userInfo[UIKeyboardFrameEndUserInfoKey] CGRectValue];
keyboardFrameEnd = [self.view convertRect:keyboardFrameEnd fromView:nil];
[UIView animateWithDuration:duration delay:0 options:UIViewAnimationOptionBeginFromCurrentState | curve animations:^{
self.contentView.frame = CGRectMake(0, 0, keyboardFrameEnd.size.width, keyboardFrameEnd.origin.y);
} completion:nil];
}
答案 3 :(得分：1)
如果其他人在学习Swift时遇到这个问题，经过很多失败的尝试后，我终于在我的ViewController中使用此代码取得了一些成功，基于Leo Natan的答案：
@IBOutlet var decimalField : UITextField!
override func viewDidLoad() {
super.viewDidLoad()
// ...
addDoneButtonToKeyboard()
// ...
// Do any additional setup after loading the view, typically from a nib.
refreshUI()
}
func addDoneButtonToKeyboard() {
var doneButton:UIBarButtonItem = UIBarButtonItem(barButtonSystemItem: .Done, target: self, action: "hideKeyboard")
var space:UIBarButtonItem = UIBarButtonItem(barButtonSystemItem: .FlexibleSpace, target: nil, action: nil)
var items = [AnyObject]()
items.append(space)
items.append(doneButton)
toolbar.items = items
decimalField.inputAccessoryView = toolbar
}
func hideKeyboard() {
decimalField.resignFirstResponder()
}
答案 4 :(得分：0)
您应该考虑在滚动视图中输入输入表单。这样，应用程序可以滚动表单，以便提交按钮变得可见。您的用户也可以向上和向下滚动以查看所有输入。
要使用带有完成按钮的数字键盘，您需要创建自定义输入视图。
另一种方法是在键盘外的任何水龙头和文本字段上关闭键盘，但用户体验会很尴尬。