Iphone 键盘显示时在iPad上滑动UITextField

我有Cocoa with Love的代码，当键盘打开时滚动UITextField，这样键盘就不会覆盖UITextField

代码如下：

- (void)textFieldDidBeginEditing:(UITextField *)textField
{
    CGRect textFieldRect = [self.view.window convertRect:textField.bounds fromView:textField];
    CGRect viewRect = [self.view.window convertRect:self.view.bounds fromView:self.view];

    CGFloat midline = textFieldRect.origin.y + 0.5 * textFieldRect.size.height;

    // Issue is that numerator isn't big enough for bottom 3rd of the screen

    CGFloat numerator = midline - viewRect.origin.y - MINIMUM_SCROLL_FRACTION * viewRect.size.height;

    CGFloat denominator = (MAXIMUM_SCROLL_FRACTION - MINIMUM_SCROLL_FRACTION) * viewRect.size.height;

    CGFloat heightFraction = numerator / denominator;

    NSLog(@"Midline: %g Fraction: %g / %g", midline, numerator, denominator);

    if (heightFraction < 0.0)
    {
        heightFraction = 0.0;
    }
    else if (heightFraction > 1.0)
    {
        heightFraction = 1.0;
    }

    UIInterfaceOrientation orientation =
    [[UIApplication sharedApplication] statusBarOrientation];
    if (orientation == UIInterfaceOrientationPortrait ||
        orientation == UIInterfaceOrientationPortraitUpsideDown)
    {
        animatedDistance = floor(PORTRAIT_KEYBOARD_HEIGHT * heightFraction);
    }
    else
    {
        animatedDistance = floor(LANDSCAPE_KEYBOARD_HEIGHT * heightFraction);
    }

    CGRect viewFrame = self.view.frame;
    viewFrame.origin.y -= animatedDistance;


    [UIView beginAnimations:nil context:NULL];
    [UIView setAnimationBeginsFromCurrentState:YES];
    [UIView setAnimationDuration:KEYBOARD_ANIMATION_DURATION];

    [self.view setFrame:viewFrame];

    [UIView commitAnimations];
}

-（void）textFieldDidBeginEditing:（UITextField*）textField
{
CGRect textFieldRect=[self.view.window convertRect:textField.bounds fromView:textField]；
CGRect viewRect=[self.view.window convertRect:self.view.bounds fromView:self.view]；
CGFloat midline=textFieldRect.origin.y+0.5*textFieldRect.size.height；
//问题是分子不够大，不适合屏幕底部的三分之一
CGFloat分子=中线-viewRect.origin.y-最小滚动分数*viewRect.size.height；
CGFloat分母=（最大滚动分数-最小滚动分数）*viewRect.size.height；
CGFloat heightFraction=分子/分母；
NSLog（@“中线：%g分数：%g/%g”，中线，分子，分母）；
如果（高度分数<0.0）
{
高度分数=0.0；
}
否则如果（高度分数>1.0）
{
高度分数=1.0；
}
界面定向=
[[UIApplication sharedApplication]statusBarOrientation]；
如果（方向==UIInterfaceOrientationParative||
方向==UIInterfaceOrientationGraphitalUpsideDown）
{
动画距离=地板（纵向\键盘\高度*高度分数）；
}
其他的
{
动画距离=地板（横向键盘高度*高度分数）；
}
CGRect viewFrame=self.view.frame；
viewFrame.origin.y-=动画距离；
[UIView beginAnimations:nil上下文：NULL]；
[UIView setAnimationBeginsFromCurrentState:是]；
[UIView设置动画持续时间：键盘动画持续时间]；
[self.view setFrame:viewFrame]；
[UIView委员会]；
}

出于调试目的，我输出中线等，以查看发生了什么。这是从上到下的选项卡。您可以看到第六个分子变为负数，因为为其父视图转换的UITExtField.size.height是一个较低的数字。我不明白为什么这个数字会是负数。当你沿着视图往下走时，高度应该上升，就像所有其他的一样

2011-05-24 09:36:08.600婴儿花[27794:207]中线=246+0.5*167

2011-05-24 09:36:08.601婴儿布鲁姆[27794:207]中线：329.5分数：22.3/409.6

2011-05-24 09:36:09.535婴儿布鲁姆[27794:207]中线=246+0.5*167

2011-05-24 09:36:09.536婴儿布鲁姆[27794:207]中线：329.5分数：22.3/409.6

2011-05-24 09:36:09.929婴儿布鲁姆[27794:207]中线=246+0.5*246

2011-05-24 09:36:09.930婴儿布鲁姆[27794:207]中线：369分数：61.8/409.6

2011-05-24 09:36:10.313婴儿布鲁姆[27794:207]中线=246+0.5*246

2011-05-24 09:36:10.314婴儿布鲁姆[27794:207]中线：369分数：61.8/409.6

2011-05-24 09:36:10.793婴儿布鲁姆[27794:207]中线=246+0.5*97

2011-05-24 09:36:10.794婴儿布鲁姆[27794:207]中线：294.5分数：-12.7/409.6

2011-05-24 09:36:11.785婴儿布鲁姆[27794:207]中线=246+0.5*148

---

2011-05-24 09:36:11.786 Baby Bloom[27794:207]中线：320个分数：12.8/409.6

以下是使其工作的代码：

- (void)textFieldDidBeginEditing:(UITextField *)textField
{
    CGRect textFieldRect = [self.view.window convertRect:textField.bounds fromView:textField];
    CGRect viewRect = [self.view.window convertRect:self.view.bounds fromView:self.view];

    float origin;
    float textFieldHeight;
    float viewOrigin;
    float viewHeight;

    UIInterfaceOrientation orientation =
    [[UIApplication sharedApplication] statusBarOrientation];


    if (orientation == UIInterfaceOrientationPortrait ||
        orientation == UIInterfaceOrientationPortraitUpsideDown)
    {
        textFieldHeight = textFieldRect.size.height;
        origin = textFieldRect.origin.y;
        viewOrigin = viewRect.origin.y;
        viewHeight = viewRect.size.height;
    }
    else
    {
        textFieldHeight = textFieldRect.size.width;
        viewOrigin = viewRect.origin.x;
        viewHeight = viewRect.size.width;
        origin = viewHeight - textFieldRect.origin.x;
    }


    CGFloat midline = origin + 0.5 * textFieldHeight;

    // Take the current middle y location of the textfield
    // If it is in the top 20% of the view don't move it
    // If it is in the middle 60% move it by a fraction of the keyboard size
    // If it is in the bottom 20% move it by the whole size of the keyboard


    CGFloat numerator = midline - viewOrigin - MINIMUM_SCROLL_FRACTION * viewHeight;

    CGFloat denominator = (MAXIMUM_SCROLL_FRACTION - MINIMUM_SCROLL_FRACTION) * viewHeight;

    CGFloat heightFraction = numerator / denominator;


    if (heightFraction < 0.0)
    {
        heightFraction = 0.0;
    }
    else if (heightFraction > 1.0)
    {
        heightFraction = 1.0;
    }

    if (orientation == UIInterfaceOrientationPortrait ||
        orientation == UIInterfaceOrientationPortraitUpsideDown)
    {
        animatedDistance = floor(PORTRAIT_KEYBOARD_HEIGHT * heightFraction);
    }
    else
    {
        animatedDistance = floor(LANDSCAPE_KEYBOARD_HEIGHT * heightFraction);
    }



    CGRect viewFrame = self.view.frame;
    viewFrame.origin.y -= animatedDistance;

    //NSLog(@"Denom: %g", denominator);
    //NSLog(@"Distance: %g", animatedDistance);

    [UIView beginAnimations:nil context:NULL];
    [UIView setAnimationBeginsFromCurrentState:YES];
    [UIView setAnimationDuration:KEYBOARD_ANIMATION_DURATION];

    [self.view setFrame:viewFrame];

    [UIView commitAnimations];
}

-（void）textFieldDidBeginEditing:（UITextField*）textField
{
CGRect textFieldRect=[self.view.window convertRect:textField.bounds fromView:textField]；
CGRect viewRect=[self.view.window convertRect:self.view.bounds fromView:self.view]；
浮动原点；
浮动高度；
浮动视图原点；
浮动视图高度；
界面定向=
[[UIApplication sharedApplication]statusBarOrientation]；
如果（方向==UIInterfaceOrientationParative||
方向==UIInterfaceOrientationGraphitalUpsideDown）
{
textFieldHeight=textFieldRect.size.height；
原点=textfieldcrect.origin.y；
viewOrigin=viewRect.origin.y；
viewHeight=viewRect.size.height；
}
其他的
{
textFieldHeight=textFieldRect.size.width；
viewOrigin=viewRect.origin.x；
viewHeight=viewRect.size.WITH；
原点=视图高度-textfieldcrect.origin.x；
}
CGFloat中线=原点+0.5*textFieldHeight；
//获取文本字段的当前中间y位置
//如果它位于视图的前20%，请不要移动它
如果它在中间60%，则按键盘大小的一小部分移动。
//如果它位于底部20%，则按键盘的整个尺寸移动它
CGFloat分子=中线-视图原点-最小滚动分数*视图高度；
CGFloat分母=（最大滚动分数-最小滚动分数）*视图高度；
CGFloat heightFraction=分子/分母；
如果（高度分数<0.0）
{
高度分数=0.0；
}
否则如果（高度分数>1.0）
{
高度分数=1.0；
}
如果（方向==UIInterfaceOrientationParative||
方向==UIInterfaceOrientationGraphitalUpsideDown）
{
动画距离=地板（纵向\键盘\高度*高度分数）；
}
其他的
{
动画距离=地板（横向键盘高度*高度分数）；
}
CGRect viewFrame=self.view.frame；
viewFrame.origin.y-=动画距离；
//NSLog（@“名称：%g”，分母）；
//NSLog（@“距离：%g”，动画距离）；
[UIView beginAnimations:nil上下文：NULL]；
[UIView setAnimationBeginsFromCurrentState:是]；
[UIView设置动画持续时间：键盘动画持续时间]；
[self.view setFrame:viewFrame]；
[UIView委员会]；
}

结果表明，当在iPad上横向显示时，它会打开原点（x现在是y，宽度现在是高度）

以下是使其工作的代码：

- (void)textFieldDidBeginEditing:(UITextField *)textField
{
    CGRect textFieldRect = [self.view.window convertRect:textField.bounds fromView:textField];
    CGRect viewRect = [self.view.window convertRect:self.view.bounds fromView:self.view];

    float origin;
    float textFieldHeight;
    float viewOrigin;
    float viewHeight;

    UIInterfaceOrientation orientation =
    [[UIApplication sharedApplication] statusBarOrientation];


    if (orientation == UIInterfaceOrientationPortrait ||
        orientation == UIInterfaceOrientationPortraitUpsideDown)
    {
        textFieldHeight = textFieldRect.size.height;
        origin = textFieldRect.origin.y;
        viewOrigin = viewRect.origin.y;
        viewHeight = viewRect.size.height;
    }
    else
    {
        textFieldHeight = textFieldRect.size.width;
        viewOrigin = viewRect.origin.x;
        viewHeight = viewRect.size.width;
        origin = viewHeight - textFieldRect.origin.x;
    }


    CGFloat midline = origin + 0.5 * textFieldHeight;

    // Take the current middle y location of the textfield
    // If it is in the top 20% of the view don't move it
    // If it is in the middle 60% move it by a fraction of the keyboard size
    // If it is in the bottom 20% move it by the whole size of the keyboard


    CGFloat numerator = midline - viewOrigin - MINIMUM_SCROLL_FRACTION * viewHeight;

    CGFloat denominator = (MAXIMUM_SCROLL_FRACTION - MINIMUM_SCROLL_FRACTION) * viewHeight;

    CGFloat heightFraction = numerator / denominator;


    if (heightFraction < 0.0)
    {
        heightFraction = 0.0;
    }
    else if (heightFraction > 1.0)
    {
        heightFraction = 1.0;
    }

    if (orientation == UIInterfaceOrientationPortrait ||
        orientation == UIInterfaceOrientationPortraitUpsideDown)
    {
        animatedDistance = floor(PORTRAIT_KEYBOARD_HEIGHT * heightFraction);
    }
    else
    {
        animatedDistance = floor(LANDSCAPE_KEYBOARD_HEIGHT * heightFraction);
    }



    CGRect viewFrame = self.view.frame;
    viewFrame.origin.y -= animatedDistance;

    //NSLog(@"Denom: %g", denominator);
    //NSLog(@"Distance: %g", animatedDistance);

    [UIView beginAnimations:nil context:NULL];
    [UIView setAnimationBeginsFromCurrentState:YES];
    [UIView setAnimationDuration:KEYBOARD_ANIMATION_DURATION];

    [self.view setFrame:viewFrame];

    [UIView commitAnimations];
}

-（void）textFiel
origin = textFieldRect.origin.x;