在IB的库中,介绍告诉我们,当按下返回键时,UITextView的键盘将消失。但实际上返回键只能作为'\n'
我可以添加一个按钮,并使用[txtView resignFirstResponder]隐藏键盘。
但是有没有办法为键盘中的返回键添加动作,这样我就不需要添加UIButton了?
在IB的库中,介绍告诉我们,当按下返回键时,UITextView的键盘将消失。但实际上返回键只能作为'\n'
我可以添加一个按钮,并使用[txtView resignFirstResponder]隐藏键盘。
但是有没有办法为键盘中的返回键添加动作,这样我就不需要添加UIButton了?
当前回答
使用导航控制器托管一个栏来解除键盘:
在.h文件中:
UIBarButtonItem* dismissKeyboardButton;
在.m文件中:
- (void)viewDidLoad {
dismissKeyboardButton = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemDone target:self action:@selector(dismissKeyboard)];
}
-(void)textViewDidBeginEditing:(UITextView *)textView {
self.navigationItem.rightBarButtonItem = dismissKeyboardButton;
}
-(void)textFieldDidBeginEditing:(UITextField *)textField {
self.navigationItem.rightBarButtonItem = dismissKeyboardButton;
}
-(void)dismissKeyboard {
[self.textField resignFirstResponder];
[self.textView resignFirstResponder];
//or replace this with your regular right button
self.navigationItem.rightBarButtonItem = nil;
}
其他回答
你应该添加UIToolbar到顶部UITextView,而不是使用shouldChangeTextIn
在Swift 4中
let toolbar = UIToolbar(frame: CGRect(x: 0, y: 0, width: UIScreen.main.bounds.width, height: 50))
toolbar.barStyle = .default
toolbar.items = [
UIBarButtonItem(barButtonSystemItem: .flexibleSpace, target: nil, action: nil),
UIBarButtonItem(title: "Done", style: .done, target: self, action: #selector(doneAction))
]
textView.inputAccessoryView = toolbar
@objc func doneAction(){
self.textView.resignFirstResponder()
}
就像matt对samvermette的评论一样,我也不喜欢检测“\n”的想法。返回键在UITextView中是有原因的,当然是去下一行。
在我看来,最好的解决方案是模仿iPhone的消息应用程序-这是在键盘上添加工具栏(和按钮)。
我从以下博客文章中得到了代码:
http://www.iosdevnotes.com/2011/02/iphone-keyboard-toolbar/
步骤:
-添加工具栏到你的XIB文件-设置高度为460
-添加工具栏按钮项(如果尚未添加)。如果需要右对齐,还可以将灵活的工具栏按钮项添加到XIB,并移动工具栏按钮项
-创建将按钮项目链接到resignFirstResponder的动作,如下所示:
- (IBAction)hideKeyboard:(id)sender {
[yourUITextView resignFirstResponder];
}
套:
- (void)viewWillAppear:(BOOL)animated {
[super viewWillAppear:animated];
[[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];
[[NSNotificationCenter defaultCenter] removeObserver:self name:UIKeyboardWillShowNotification object:nil];
[[NSNotificationCenter defaultCenter] removeObserver:self name:UIKeyboardWillHideNotification object:nil];
}
- (void)keyboardWillShow:(NSNotification *)notification {
[UIView beginAnimations:nil context:NULL];
[UIView setAnimationDuration:0.3];
CGRect frame = self.keyboardToolbar.frame;
frame.origin.y = self.view.frame.size.height - 260.0;
self.keyboardToolbar.frame = frame;
[UIView commitAnimations];
}
- (void)keyboardWillHide:(NSNotification *)notification {
[UIView beginAnimations:nil context:NULL];
[UIView setAnimationDuration:0.3];
CGRect frame = self.keyboardToolbar.frame;
frame.origin.y = self.view.frame.size.height;
self.keyboardToolbar.frame = frame;
[UIView commitAnimations];
}
//你可以使用这个…
步骤1。第一步是确保声明了对UITextViewDelegate协议的支持。这是在你的头文件中完成的,例如这里的头文件叫做
EditorController。h:
@interface EditorController : UIViewController {
UITextView *messageTextView;
}
@property (nonatomic, retain) UITextView *messageTextView;
@end
步骤2。接下来你需要将控制器注册为UITextView的委托。从上面的例子继续,这里是我如何用EditorController作为委托初始化UITextView…
- (id) init {
if (self = [super init]) {
// define the area and location for the UITextView
CGRect tfFrame = CGRectMake(10, 10, 300, 100);
messageTextView = [[UITextView alloc] initWithFrame:tfFrame];
// make sure that it is editable
messageTextView.editable = YES;
// add the controller as the delegate
messageTextView.delegate = self;
}
步骤3。现在拼图的最后一块是采取行动响应shouldCahngeTextInRange消息如下:
- (BOOL)textView:(UITextView *)textView shouldChangeTextInRange:(NSRange)range
replacementText:(NSString *)text
{
// Any new character added is passed in as the "text" parameter
if ([text isEqualToString:@"\n"]) {
// Be sure to test for equality using the "isEqualToString" message
[textView resignFirstResponder];
// Return FALSE so that the final '\n' character doesn't get added
return FALSE;
}
// For any other character return TRUE so that the text gets added to the view
return TRUE;
}
对于Swift 3,这段代码允许我在UITextView之外按下键来解除键盘。
@IBOutlet weak var comment: UITextView!
override func viewDidLoad() {
super.viewDidLoad()
comment.delegate = self
let tapGestureRecogniser = UITapGestureRecognizer(target: self, action: #selector(tap))
view.addGestureRecognizer(tapGestureRecogniser)
}
func tap(sender: UITapGestureRecognizer) {
if comment.isFirstResponder {
comment.resignFirstResponder()
}
}
在视图控制器中添加这个方法。
迅速:
func textView(textView: UITextView, shouldChangeTextInRange range: NSRange, replacementText text: String) -> Bool {
if text == "\n" {
textView.resignFirstResponder()
return false
}
return true
}
这个方法对你也有帮助:
/**
Dismiss keyboard when tapped outside the keyboard or textView
:param: touches the touches
:param: event the related event
*/
override func touchesBegan(touches: NSSet, withEvent event: UIEvent) {
if let touch = touches.anyObject() as? UITouch {
if touch.phase == UITouchPhase.Began {
textField?.resignFirstResponder()
}
}
}