首先创建一个视图(我在一个单独的 nib 文件中完成并以这种方式加载它):
NSArray *views = [[NSBundle mainBundle] loadNibNamed:@"ReducedNumericKeyboardView"
owner:self
options:nil];
keyBView = (ReducedNumericKeyboardView*)[views objectAtIndex:0];
之后,我将它设置为我想使用它的文本字段的输入视图(实际上,这是对您问题的简短回答;)):
[self.propertyEditor setInputView:keyBView];
当点击该字段时,我会滚动查看小狗(如有必要)以不覆盖该字段:
CGRect textFieldRect = [self.tableViewController.view.window convertRect:propertyEditor.bounds fromView:propertyEditor];
CGRect viewRect = [self.tableViewController.view.window convertRect:self.tableViewController.view.bounds fromView:self.tableViewController.view];
CGFloat midLine = textFieldRect.origin.y+.5*textFieldRect.size.height;
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 = MIN(1, MAX(0, numerator/denominator));
animateDistance = floor(PORTRAIT_USER_INPUT_VIEW_HEIGHT*heightFraction);
CGRect viewFrame = self.tableViewController.view.frame;
viewFrame.origin.y -= animateDistance;
[UIView beginAnimations:nil context:NULL];
[UIView setAnimationBeginsFromCurrentState:YES];
[UIView setAnimationDuration:USER_INPUT_ANIMATION_DURATION];
[self.tableViewController.view setFrame:viewFrame];
[UIView commitAnimations];
编辑完成后,我会向下滚动视图:
CGRect viewFrame = self.tableViewController.view.frame;
viewFrame.origin.y += animateDistance;
[UIView beginAnimations:nil context:NULL];
[UIView setAnimationBeginsFromCurrentState:YES];
[UIView setAnimationDuration:USER_INPUT_ANIMATION_DURATION];
[self.tableViewController.view setFrame:viewFrame];
[UIView commitAnimations];
我使用的约束设置如下:
static const CGFloat USER_INPUT_ANIMATION_DURATION = 0.3;
static const CGFloat PORTRAIT_USER_INPUT_VIEW_HEIGHT = 180;
static const CGFloat MINIMUM_SCROLL_FRACTION = 0.1;
static const CGFloat MAXIMUM_SCROLL_FRACTION = 0.2;