關於ios鍵盤遮擋輸入框

今天我來講一下鍵盤遮擋輸入框時的解決方法。我做的一個界面是這樣的

我的輸入框是在最下面，如果不做相關的操作的話，當編輯UITextField的時候，彈出鍵盤就會擋着輸入框，那怎么解決這個問題呢，我們可以考慮讓輸入框隨鍵盤一起向上移動，當關閉鍵盤時讓輸入框也一起向下移動回到原來的位置，這樣就可以解決鍵盤擋着輸入框的問題啦

下面看具體的代碼實現：

在ios5.0之前呢鍵盤高度固定是216像素高，而ios5.0之后包括ios5.0鍵盤的高度再不是固定的，當由英文切換在中文輸入時，鍵盤由原來的216變成了252

先說ios5.0之前的解決辦法吧，我是通過UITextField的委托方法-(void)textFieldDidBeginEditing:(UITextField *)textField和另一個關掉鍵盤的方法

- (BOOL)textFieldShouldReturn:(UITextField *)textField來實現的，點擊鍵盤上的Return會關掉鍵盤的

- (void)textFieldDidBeginEditing:(UITextField *)textField
{
    CGRect frame = textField.frame;
    int offset = frame.origin.y +422 - (self.view.frame.size.height - 240);//鍵盤高度216
    NSLog(@"offset is %d",offset);
    NSTimeInterval animationDuration = 0.30f;
    [UIView beginAnimations:@"ResizeForKeyBoard" context:nil];
    [UIView setAnimationDuration:animationDuration];
    float width = self.view.frame.size.width;
    float height = self.view.frame.size.height;
    if(offset > 0)
    {
        CGRect rect = CGRectMake(0.0f, -offset,width,height);
        self.view.frame = rect;
    }
    [UIView commitAnimations];
}

- (BOOL)textFieldShouldReturn:(UITextField *)textField
{
    NSTimeInterval animationDuration = 0.30f;
    [UIView beginAnimations:@"ResizeForKeyboard" context:nil];
    [UIView setAnimationDuration:animationDuration];
    CGRect rect = CGRectMake(0.0f, 0.0f, self.view.frame.size.width, self.view.frame.size.height);
    self.view.frame = rect;
    [UIView commitAnimations];
    [textField resignFirstResponder];
    return YES;
}

對了在添加-(void)textFieldDidBeginEditing:(UITextField *)textField方法前要聲明並設置delegate

另一個方法是針對ios5.0之后鍵盤高度隨輸入法不同變化時的解決辦法，同時也適用於ios5.0之前

在-(void)viewDidLoad方法里面添加通知

  if(IOS_VERSION<5.0)
    {
        [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillShow:) name:UIKeyboardWillShowNotification object:nil];
        [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillShow:) name:UIKeyboardWillHideNotification object:nil];
    }else{
        [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillShow:) name:UIKeyboardWillShowNotification object:nil];
    }

至於如何獲取IOS系統版本號通過如下可獲取

#define IOS_VERSION [[[UIDevice currentDevice] systemVersion] floatValue]

添加一個方法-(void)keyboardWillShow:(NSNotification *)notification具體如下

-(void)keyboardWillShow:(NSNotification *)notification
{

#if __IPHONE_OS_VERSION_MAX_ALLOWED >= __IPHONE_3_2
        if (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPhone) {
#endif
#if __IPHONE_OS_VERSION_MIN_REQUIRED >= __IPHONE_3_2
            NSValue *keyboardBoundsValue = [[notification userInfo] objectForKey:UIKeyboardFrameEndUserInfoKey];
#else
            NSValue *keyboardBoundsValue = [[notification userInfo] objectForKey:UIKeyboardBoundsUserInfoKey];
#endif
            CGRect keyboardBounds;
            [keyboardBoundsValue getValue:&keyboardBounds];
            NSInteger offset =self.view.frame.size.height-keyboardBounds.origin.y+64.0;
            CGRect listFrame = CGRectMake(0, -offset, self.view.frame.size.width,self.view.frame.size.height);
            NSLog(@"offset is %d",offset);
            [UIView beginAnimations:@"anim" context:NULL];
            [UIView setAnimationCurve:UIViewAnimationCurveEaseInOut];
            [UIView setAnimationBeginsFromCurrentState:YES];
            [UIView setAnimationDuration:0.3];
            //處理移動事件，將各視圖設置最終要達到的狀態
    
            self.view.frame=listFrame;
            
            [UIView commitAnimations];
            
        }
}

這個是編輯輸入框時的效果

這個是鍵盤切換成中文輸入法時的效果