我如何通过iPhone键盘上的“下一步”按钮浏览所有的文本字段?
最后一个文本字段应该关闭键盘。
我已经设置了IB按钮(下一步/完成)，但现在我卡住了。
我实现了textFieldShouldReturn动作，但现在下一步和完成按钮关闭键盘。
当前回答
我已经实现了在视图层次结构中通过Responders导航的动态解决方案。其思想是，在整个层次结构中搜索下一个可能的响应器，根据需要向前或向后搜索。
UIView搜索扩展:
UIView+Cat.h
- (UIResponder *)getNextFirstResponder;
- (UIResponder *)getPreviousFirstResponder;
UIView+Cat.m
- (UIResponder *)getPreviousFirstResponder {
if (!self.superview) {
return nil;
}
BOOL hasreachedself = NO;
for (NSInteger i = self.superview.subviews.count-1; i >= 0; i--) {
UIView *v = [self.superview.subviews objectAtIndex:i];
if (v == self) {
hasreachedself = YES;
continue;
}
if (!hasreachedself) continue;
if ([v canBecomeFirstResponder] && !v.hidden) {
return v;
}
UIResponder *subResponder = [self getNextFirstResponderInView:v];
if (subResponder) {
return subResponder;
}
}
//search hierachicaly in superviews
return [self.superview getPreviousFirstResponder];
}
- (UIResponder *)getNextFirstResponder {
if (!self.superview) {
return nil;
}
BOOL hasreachedself = NO;
for (UIView *v in self.superview.subviews) {
if (v == self) {
hasreachedself = YES;
continue;
}
if (!hasreachedself) continue;
if ([v canBecomeFirstResponder] && !v.hidden) {
return v;
}
UIResponder *subResponder = [self getNextFirstResponderInView:v];
if (subResponder) {
return subResponder;
}
}
//search hierachicaly in superviews
return [self.superview getNextFirstResponder];
}
- (UIResponder *)getNextFirstResponderInView:(UIView *)view {
if ([view canBecomeFirstResponder] && !view.hidden) {
return view;
}
for (UIView *v in view.subviews) {
UIResponder *subResponder = [self getNextFirstResponderInView:v];
if (subResponder) {
return subResponder;
}
}
return nil;
}
用法:添加UIToolbar到UITextField / UITextView(在类别或子类中):
- (void)addToolbarInputAccessoryView {
UIToolbar *toolbar = [[UIToolbar alloc] initWithFrame:CGRectZero];
UIBarButtonItem *prev = [[UIBarButtonItem alloc] initWithImage:[UIImage systemImageNamed:@"chevron.up"] style:UIBarButtonItemStylePlain target:self action:@selector(moveToPreviousFirstResponder)];
UIBarButtonItem *next = [[UIBarButtonItem alloc] initWithImage:[UIImage systemImageNamed:@"chevron.down"] style:UIBarButtonItemStylePlain target:self action:@selector(moveToNextFirstResponder)];
UIBarButtonItem *space = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFlexibleSpace target:nil action:nil];
UIBarButtonItem *done = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemDone target:self action:@selector(hideKeyboard)];
toolbar.items = @[prev, next, space, done];
if ([[UITextField appearance] keyboardAppearance] == UIKeyboardAppearanceDark) {
toolbar.barStyle = UIBarStyleBlack;
toolbar.translucent = YES;
[toolbar setBarTintColor:[UIColor blackColor]];
[toolbar setTintColor:[UIColor whiteColor]];
}
[toolbar sizeToFit];
self.inputAccessoryView = toolbar;
}
- (void)hideKeyboard {
[self resignFirstResponder];
}
- (void)moveToNextFirstResponder {
UIResponder *next = [self getNextFirstResponder];
if (next) {
[next becomeFirstResponder];
}
else {
[self resignFirstResponder];
}
}
- (void)moveToPreviousFirstResponder {
UIResponder *prev = [self getPreviousFirstResponder];
if (prev) {
[prev becomeFirstResponder];
}
else {
[self resignFirstResponder];
}
}
其他回答
这对我在Xamarin很有效。iOS / Monotouch。 将键盘按钮更改为Next，将控件传递给下一个UITextField，并将键盘隐藏在最后一个UITextField之后。
private void SetShouldReturnDelegates(IEnumerable<UIView> subViewsToScout )
{
foreach (var item in subViewsToScout.Where(item => item.GetType() == typeof (UITextField)))
{
(item as UITextField).ReturnKeyType = UIReturnKeyType.Next;
(item as UITextField).ShouldReturn += (textField) =>
{
nint nextTag = textField.Tag + 1;
var nextResponder = textField.Superview.ViewWithTag(nextTag);
if (null != nextResponder)
nextResponder.BecomeFirstResponder();
else
textField.Superview.EndEditing(true);
//You could also use textField.ResignFirstResponder();
return false; // We do not want UITextField to insert line-breaks.
};
}
}
在ViewDidLoad里面你会有:
如果你的TextFields没有标签设置它现在:
txtField1.Tag = 0;
txtField2.Tag = 1;
txtField3.Tag = 2;
//...
只是一个电话
SetShouldReturnDelegates(yourViewWithTxtFields.Subviews.ToList());
//If you are not sure of which view contains your fields you can also call it in a safer way:
SetShouldReturnDelegates(txtField1.Superview.Subviews.ToList());
//You can also reuse the same method with different containerViews in case your UITextField are under different views.
我已经添加到PeyloW的答案，以防你想实现一个previous/next按钮功能:
- (IBAction)moveThroughTextFields:(UIBarButtonItem *)sender
{
NSInteger nextTag;
UITextView *currentTextField = [self.view findFirstResponderAndReturn];
if (currentTextField != nil) {
// I assigned tags to the buttons. 0 represent prev & 1 represents next
if (sender.tag == 0) {
nextTag = currentTextField.tag - 1;
} else if (sender.tag == 1) {
nextTag = currentTextField.tag + 1;
}
}
// Try to find next responder
UIResponder* nextResponder = [self.view viewWithTag:nextTag];
if (nextResponder) {
// Found next responder, so set it.
// I added the resign here in case there's different keyboards in place.
[currentTextField resignFirstResponder];
[nextResponder becomeFirstResponder];
} else {
// Not found, so remove keyboard.
[currentTextField resignFirstResponder];
}
}
你像这样子类化UIView:
@implementation UIView (FindAndReturnFirstResponder)
- (UITextView *)findFirstResponderAndReturn
{
for (UITextView *subView in self.subviews) {
if (subView.isFirstResponder){
return subView;
}
}
return nil;
}
@end
下面是一个swift3版本的Anth0的答案。我把它贴在这里，以帮助任何想要利用他的伟大答案的敏捷开发人员!当您设置关联对象时，我擅自添加了一个返回键类型“Next”。
extension UITextField {
@nonobjc static var NextHashKey: UniChar = 0
var nextTextField: UITextField? {
get {
return objc_getAssociatedObject(self,
&UITextField.NextHashKey) as? UITextField
}
set(next) {
self.returnKeyType = UIReturnKeyType.next
objc_setAssociatedObject(self,
&UITextField.NextHashKey,next,.OBJC_ASSOCIATION_RETAIN_NONATOMIC)
}
}
}
下面是另一个扩展，它显示了使用上述代码循环遍历UITextFields列表的可能性。
extension UIViewController: UITextFieldDelegate {
public func textFieldShouldReturn(_ textField: UITextField) -> Bool {
guard let next = textField.nextTextField else {
textField.resignFirstResponder()
return true
}
next.becomeFirstResponder()
return false
}
}
然后在你的ViewController或者其他地方，你可以像这样设置你的文本框。
@IBOutlet fileprivate weak var textfield1: UITextField!
@IBOutlet fileprivate weak var textfield2: UITextField!
@IBOutlet fileprivate weak var textfield3: UITextField!
...
[textfield1, textfield2, textfield3].forEach{ $0?.delegate = self }
textfield1.nextTextField = textfield2
textfield2.nextTextField = textfield3
// We don't assign a nextTextField to textfield3 because we want
// textfield3 to be the last one and resignFirstResponder when
// the return button on the soft keyboard is tapped.
我已经实现了在视图层次结构中通过Responders导航的动态解决方案。其思想是，在整个层次结构中搜索下一个可能的响应器，根据需要向前或向后搜索。
UIView搜索扩展:
UIView+Cat.h
- (UIResponder *)getNextFirstResponder;
- (UIResponder *)getPreviousFirstResponder;
UIView+Cat.m
- (UIResponder *)getPreviousFirstResponder {
if (!self.superview) {
return nil;
}
BOOL hasreachedself = NO;
for (NSInteger i = self.superview.subviews.count-1; i >= 0; i--) {
UIView *v = [self.superview.subviews objectAtIndex:i];
if (v == self) {
hasreachedself = YES;
continue;
}
if (!hasreachedself) continue;
if ([v canBecomeFirstResponder] && !v.hidden) {
return v;
}
UIResponder *subResponder = [self getNextFirstResponderInView:v];
if (subResponder) {
return subResponder;
}
}
//search hierachicaly in superviews
return [self.superview getPreviousFirstResponder];
}
- (UIResponder *)getNextFirstResponder {
if (!self.superview) {
return nil;
}
BOOL hasreachedself = NO;
for (UIView *v in self.superview.subviews) {
if (v == self) {
hasreachedself = YES;
continue;
}
if (!hasreachedself) continue;
if ([v canBecomeFirstResponder] && !v.hidden) {
return v;
}
UIResponder *subResponder = [self getNextFirstResponderInView:v];
if (subResponder) {
return subResponder;
}
}
//search hierachicaly in superviews
return [self.superview getNextFirstResponder];
}
- (UIResponder *)getNextFirstResponderInView:(UIView *)view {
if ([view canBecomeFirstResponder] && !view.hidden) {
return view;
}
for (UIView *v in view.subviews) {
UIResponder *subResponder = [self getNextFirstResponderInView:v];
if (subResponder) {
return subResponder;
}
}
return nil;
}
用法:添加UIToolbar到UITextField / UITextView(在类别或子类中):
- (void)addToolbarInputAccessoryView {
UIToolbar *toolbar = [[UIToolbar alloc] initWithFrame:CGRectZero];
UIBarButtonItem *prev = [[UIBarButtonItem alloc] initWithImage:[UIImage systemImageNamed:@"chevron.up"] style:UIBarButtonItemStylePlain target:self action:@selector(moveToPreviousFirstResponder)];
UIBarButtonItem *next = [[UIBarButtonItem alloc] initWithImage:[UIImage systemImageNamed:@"chevron.down"] style:UIBarButtonItemStylePlain target:self action:@selector(moveToNextFirstResponder)];
UIBarButtonItem *space = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFlexibleSpace target:nil action:nil];
UIBarButtonItem *done = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemDone target:self action:@selector(hideKeyboard)];
toolbar.items = @[prev, next, space, done];
if ([[UITextField appearance] keyboardAppearance] == UIKeyboardAppearanceDark) {
toolbar.barStyle = UIBarStyleBlack;
toolbar.translucent = YES;
[toolbar setBarTintColor:[UIColor blackColor]];
[toolbar setTintColor:[UIColor whiteColor]];
}
[toolbar sizeToFit];
self.inputAccessoryView = toolbar;
}
- (void)hideKeyboard {
[self resignFirstResponder];
}
- (void)moveToNextFirstResponder {
UIResponder *next = [self getNextFirstResponder];
if (next) {
[next becomeFirstResponder];
}
else {
[self resignFirstResponder];
}
}
- (void)moveToPreviousFirstResponder {
UIResponder *prev = [self getPreviousFirstResponder];
if (prev) {
[prev becomeFirstResponder];
}
else {
[self resignFirstResponder];
}
}
如果有人想这样。我认为这是最接近问题所要求的要求
下面是我如何实现它
为需要设置的每个文本字段添加附件视图，使用
func setAccessoryViewFor(textField : UITextField) {
let toolBar = UIToolbar()
toolBar.barStyle = .default
toolBar.isTranslucent = true
toolBar.sizeToFit()
// Adds the buttons
// Add previousButton
let prevButton = UIBarButtonItem(title: "<", style: .plain, target: self, action: #selector(previousPressed(sender:)))
prevButton.tag = textField.tag
if getPreviousResponderFor(tag: textField.tag) == nil {
prevButton.isEnabled = false
}
// Add nextButton
let nextButton = UIBarButtonItem(title: ">", style: .plain, target: self, action: #selector(nextPressed(sender:)))
nextButton.tag = textField.tag
if getNextResponderFor(tag: textField.tag) == nil {
nextButton.title = "Done"
}
let spaceButton = UIBarButtonItem(barButtonSystemItem: .flexibleSpace, target: nil, action: nil)
toolBar.setItems([prevButton,spaceButton,nextButton], animated: false)
toolBar.isUserInteractionEnabled = true
textField.inputAccessoryView = toolBar
}
使用以下函数来处理轻拍
func nextPressed(sender : UIBarButtonItem) {
if let nextResponder = getNextResponderFor(tag: sender.tag) {
nextResponder.becomeFirstResponder()
} else {
self.view.endEditing(true)
}
}
func previousPressed(sender : UIBarButtonItem) {
if let previousResponder = getPreviousResponderFor(tag : sender.tag) {
previousResponder.becomeFirstResponder()
}
}
func getNextResponderFor(tag : Int) -> UITextField? {
return self.view.viewWithTag(tag + 1) as? UITextField
}
func getPreviousResponderFor(tag : Int) -> UITextField? {
return self.view.viewWithTag(tag - 1) as? UITextField
}
您需要按您希望下一个/前一按钮响应的顺序给出textFields标记。
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