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
我使用这段代码来更改响应器。
- (BOOL)textView:(UITextView*) textView shouldChangeTextInRange: (NSRange) range replacementText: (NSString*) text
{
if ([text isEqualToString:@"\n"]) {
//[textView resignFirstResponder];
//return YES;
NSInteger nextTag = textView.tag + 1;
// Try to find next responder
UIResponder* nextResponder = [self.view viewWithTag:nextTag];
if (nextResponder) {
// Found next responder, so set it.
[nextResponder becomeFirstResponder];
} else {
// Not found, so remove keyboard.
[textView resignFirstResponder];
}
return NO;
return NO;
}
return YES;
}
其他回答
函数hideQueboard。
- (void)HideQueyboard
{
[[UIApplication sharedApplication] sendAction:@selector(resignFirstResponder) to:nil from:nil forEvent:nil];
}
+ (void)addDoneButtonToControl:(id)txtFieldOrTextView
{
if([txtFieldOrTextView isKindOfClass:[UITextField class]])
{
txtFieldOrTextView = (UITextField *)txtFieldOrTextView;
}
else if([txtFieldOrTextView isKindOfClass:[UITextView class]])
{
txtFieldOrTextView = (UITextView *)txtFieldOrTextView;
}
UIToolbar* numberToolbar = [[UIToolbar alloc]initWithFrame:CGRectMake(0,
0,
[Global returnDeviceWidth],
50)];
numberToolbar.barStyle = UIBarStyleDefault;
UIBarButtonItem *btnDone = [[UIBarButtonItem alloc] initWithImage:[UIImage imageNamed:@"btn_return"]
style:UIBarButtonItemStyleBordered
target:txtFieldOrTextView
action:@selector(resignFirstResponder)];
numberToolbar.items = [NSArray arrayWithObjects:btnDone,nil];
[numberToolbar sizeToFit];
if([txtFieldOrTextView isKindOfClass:[UITextField class]])
{
((UITextField *)txtFieldOrTextView).inputAccessoryView = numberToolbar;
}
else if([txtFieldOrTextView isKindOfClass:[UITextView class]])
{
((UITextView *)txtFieldOrTextView).inputAccessoryView = numberToolbar;
}
}
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()
}
在viewDidLoad中添加一个观察者
[[NSNotificationCenter defaultCenter] addObserver: self selector: @selector(textViewKeyPressed:) name: UITextViewTextDidChangeNotification object: nil];
然后使用选择器检查"\n"
-(void) textViewKeyPressed: (NSNotification*) notification {
if ([[[notification object] text] hasSuffix:@"\n"])
{
[[notification object] resignFirstResponder];
}
}
它确实使用“\n”,而不是专门检查返回键,但我认为这是可以的。
更新
参见下面ribto的答案,它使用[NSCharacterSet newlineCharacterSet]来代替\n
我想我应该把这个片段放在这里:
确保声明了对UITextViewDelegate协议的支持。
- (BOOL)textView:(UITextView *)textView shouldChangeTextInRange:(NSRange)range replacementText:(NSString *)text {
if([text isEqualToString:@"\n"]) {
[textView resignFirstResponder];
return NO;
}
return YES;
}
Swift 4.0更新:
func textView(_ textView: UITextView, shouldChangeTextIn range: NSRange, replacementText text: String) -> Bool {
if text == "\n" {
textView.resignFirstResponder()
return false
}
return true
}