在IOS開法中經(jīng)常會(huì)遇到鍵盤遮擋屏幕的事情（比如輸入賬號(hào)密碼驗(yàn)證碼等等），就使得原本都不大的屏幕直接占了一半甚至更多的位置，這倒無所謂，關(guān)鍵是擋住了下面的按鈕。這樣的話按鈕的事件也就觸發(fā)不了，最好的解決辦法就是當(dāng)輸入這些信息的時(shí)候讓整個(gè)屏幕上移一個(gè)鍵盤的位置，或者上移到指定的位置。
因?yàn)椴皇侵挥械卿涀?cè)界面才會(huì)有這個(gè)問題,所以最好把這種聲明寫到基類里。然后所有的controller都繼承基類。
一、
首先一般輸入的話都用的是UITextField，所以要監(jiān)聽用戶什么時(shí)候開始輸入和什么時(shí)候結(jié)束輸入，直接設(shè)置代理代理就行了,要遵受
UITextFieldDelegate協(xié)議。
//遵循協(xié)議
@interfaceViewController()
//代理方法
#pragma mark - UITextFieldDelegate
-(BOOL)textFieldShouldReturn:(UITextField *)textField
{
return [textField resignFirstResponder];
}
//鍵盤彈出時(shí)屏幕上移
-(void)textFieldDidBeginEditing:(UITextField*)textField
{
//假如多個(gè)輸入，比如注冊(cè)和登錄，就可以根據(jù)不同的輸入框來上移不同的位置，從而更加人性化
//鍵盤高度216
//滑動(dòng)效果（動(dòng)畫）
CGRect frame = textField.frame;
int offset = frame.origin.y + 32 - (HEIGHT- 280.0);//鍵盤高度216
NSTimeInterval animationDuration = 0.30f;
[UIView beginAnimations:@"ResizeForKeyBoard" context:nil];
[UIView setAnimationDuration:animationDuration];
if(offset > 0)//加上屏幕上移textField是否會(huì)移除屏幕的判斷
{
CGRect rect = CGRectMake(0.0f, -offset,WIDTH,HEIGHT);
self.view.frame = rect;
}
[UIView commitAnimations];
}
//取消第一響應(yīng)，也就是輸入完畢，屏幕恢復(fù)原狀
-(void)textFieldDidEndEditing:(UITextField*)textField
{
//滑動(dòng)效果
NSTimeIntervalanimationDuration =0.30f;
[UIViewbeginAnimations:@"ResizeForKeyboard"context:nil];
[UIViewsetAnimationDuration:animationDuration];
//恢復(fù)屏幕
self.view.frame=CGRectMake(0.0f,0.0f,self.view.frame.size.width,self.view.frame.size.height);
[UIViewcommitAnimations];
}
二、
也可以用給鍵盤kvc實(shí)現(xiàn)功能
在基類的viewWillAppear方法中注冊(cè)監(jiān)聽。
- (void)viewWillAppear:(BOOL)animated
{
[super viewWillAppear:animated];
[self setupForKeyBoard];
}
#pragma mark -鍵盤相關(guān)
//鍵盤的準(zhǔn)備
- (void)setupForKeyBoard
{
NSNotificationCenter *nc = [NSNotificationCenter defaultCenter];
//點(diǎn)擊手勢(shì)
UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(keyBoardHideAction)];
NSOperationQueue *mainQueue = [NSOperationQueue mainQueue];
//鍵盤顯示后添加手勢(shì)
[nc addObserverForName:UIKeyboardWillShowNotification object:nil queue:mainQueue usingBlock:^(NSNotification * _Nonnull note) {
[self.view addGestureRecognizer:tap];
[self keyboardWillShow:note];
}];
//鍵盤消失后移除手勢(shì)
[nc addObserverForName:UIKeyboardWillHideNotification object:nil queue:mainQueue usingBlock:^(NSNotification * _Nonnull note) {
[self.view removeGestureRecognizer:tap];
//鍵盤動(dòng)畫時(shí)間
double duration = [[note.userInfo objectForKey:UIKeyboardAnimationDurationUserInfoKey] doubleValue];
[UIView animateWithDuration:duration animations:^{
self.view.frame = CGRectMake(0,? 0 , WIDTH, HEIGHT);
}];
}];
}
//鍵盤消失后view下移
- (void)keyBoardHideAction
{
[self.view endEditing:YES];
}
//通過note獲取鍵盤高度，鍵盤動(dòng)畫時(shí)間
- (void)keyboardWillShow:(NSNotification *)note
{
//獲取鍵盤高度，在不同設(shè)備上，以及中英文下是不同的
CGFloat keyboardH = [[note.userInfo objectForKey:UIKeyboardFrameEndUserInfoKey] CGRectValue].size.height;
//計(jì)算出鍵盤頂端到inputTextView panel底端的距離(加上自定義的緩沖距離INTERVAL_KEYBOARD)
CGFloat offset = (self.viewBottom+INTERVAL_KEYBOARD) - (self.view.frame.size.height - kbHeight);
//鍵盤動(dòng)畫時(shí)間
double duration = [[note.userInfo objectForKey:UIKeyboardAnimationDurationUserInfoKey] doubleValue];
if (offset > 0){
[UIView animateWithDuration:duration animations:^{
self.view.frame = CGRectMake(0, - offset ), WIDTH, HEIGHT);
}];
}
#pragma mark - UITextViewDelegate
- (void)textViewDidBeginEditing:(UITextView *)textView
{
//將textField的rect轉(zhuǎn)換到self.view上
CGRect rect = [textView.superview convertRect:textView.frame toView:self.view];
//textField的底部
self.viewBottom = rect.origin.y + rect.size.height;
}
- (void)textViewDidEndEditing:(UITextView *)textView
{
[UIView animateWithDuration:0.25 animations:^{
self.view.frame = CGRectMake(0, 0, WIDTH, HEIGHT);
}];
}
