iOS鍵盤彈出遮擋輸入框的解決方法

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本文為大傢分享瞭iOS鍵盤彈出遮擋輸入框的解決方法，供大傢參考，具體內容如下

問題：輸入框被鍵盤遮擋

期望效果：輸入框位於鍵盤上方

解決思路：

監聽鍵盤出現和消失的狀態，當鍵盤出現時，當前視圖上移，當輸入完成收起鍵盤時，視圖回到初始狀態。

難點：視圖向上平移的距離

原理都差不多，oc版參考代碼：

self.phoneInput = [UITextField new];
  self.phoneInput.placeholder = @"請輸入...";
  [self.view addSubview:self.phoneInput];


///鍵盤彈出 處理遮擋問題
- (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)keyboardWillShow:(NSNotification *)notification
{
 //獲取處於焦點中的view
 NSArray *textFields = @[self.phoneInput];
 UIView *focusView = nil;
 for (UITextField *view in textFields) {
  if ([view isFirstResponder]) {
   focusView = view;
   break;
  }
 }
 if (focusView) {
   //獲取鍵盤彈出的時間
   double duration = [notification.userInfo[UIKeyboardAnimationDurationUserInfoKey] doubleValue];
   //獲取鍵盤上端Y坐標
   CGFloat keyboardY = [notification.userInfo[UIKeyboardFrameEndUserInfoKey] CGRectValue].origin.y;
   //獲取輸入框下端相對於window的Y坐標
   CGRect rect = [focusView convertRect:focusView.bounds toView:[[[UIApplication sharedApplication] delegate] window]];
   CGPoint tmp = rect.origin;
   CGFloat inputBoxY = tmp.y + focusView.frame.size.height;
   //計算二者差值
   CGFloat ty = keyboardY- inputBoxY;
   NSLog(@"position keyboard: %f, inputbox: %f, ty: %f", keyboardY, inputBoxY, ty);
   //差值小於0，做平移變換
   [UIView animateWithDuration:duration animations:^{
    if (ty < 0) {
     self.view.transform = CGAffineTransformMakeTranslation(0, ty);
    }
   }];
  }
}

- (void)keyboardWillHide:(NSNotification *)notification
{
 //獲取鍵盤彈出的時間
 double duration = [notification.userInfo[UIKeyboardAnimationDurationUserInfoKey] doubleValue];
 //還原
 [UIView animateWithDuration:duration animations:^{
   self.view.transform = CGAffineTransformMakeTranslation(0, 0);
 }];
}
///<UITextFieldDelegate>
///UITextFieldDelegate編輯完成，視圖恢復原狀
-(void)textFieldDidEndEditing:(UITextField *)textField
{
   self.view.frame =CGRectMake(0, 0, [[UIScreen mainScreen] bounds].size.width,[[UIScreen mainScreen] bounds].size.height);
}

以上就是本文的全部內容，希望對大傢的學習有所幫助，也希望大傢多多支持WalkonNet。

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