键盘显示时向上移动UIView [英] Moving UIView up when keyboard shown

问题描述

我知道这是一个经常出现的问题，但我没有从我找到的例子中实现这一点。我可能会做一些简单的错误..（希望如此）。我试图将UIview移动到隐藏在底部的文本字段。

关于我的应用程序，它有一个标签栏控制器并实现标准UIView 。当我添加代码移动显示时没有任何反应。我需要有一个滚动视图才能使用它，它是否与制表符控制器发生冲突或者我在做其他错误的操作？谢谢

Dan

解决方案

我在UIView上写了一个小类别管理暂时滚动的东西，而不需要将整个事物包装到UIScrollView中。我在这里使用动词scroll可能并不理想，因为它可能会让你认为有一个滚动视图，而且没有 - 我们只是动画UIView（或UIView子类）的位置。

这里嵌入了许多魔法数字，这些数字适合我的表格和布局，可能不适合你的，所以我鼓励调整它以满足你的特定需求。 / p>

UIView + FormScroll.h：

  #import< Foundation / Foundation.h> 
 
 @interface UIView（FormScroll）
 
  - （void）scrollToY：（float）y; 
  - （void）scrollToView：（UIView *）视图; 
  - （void）scrollElement：（UIView *）view toPoint：（float）y; 
 
 @end 
  

UIView + FormScroll.m：

  #importUIView + FormScroll.h
 
 
 @implementation UIView（FormScroll）
 
 
  - （void）scrollToY：（float）y 
 {
 
 [UIView beginAnimations：@registerScrollcontext：NULL]; 
 [UIView setAnimationCurve：UIViewAnimationCurveEaseInOut]; 
 [UIView setAnimationDuration：0.4]; 
 self.transform = CGAffineTransformMakeTranslation（0，y）; 
 [UIView commitAnimations]; 
 
} 
 
  - （void）scrollToView：（UIView *）view 
 {
 CGRect theFrame = view.frame; 
 float y = theFrame.origin.y  -  15; 
 y  -  =（y / 1.7）; 
 [self scrollToY：-y]; 
} 
 
 
  - （void）scrollElement：（UIView *）view toPoint：（float）y 
 {
 CGRect theFrame = view.frame; 
 float orig_y = theFrame.origin.y; 
 float diff = y  -  orig_y; 
 if（diff< 0）{
 [self scrollToY：diff]; 
} 
 else {
 [self scrollToY：0]; 
} 
 
} 
 
 @end 
  

将其导入你的UIViewController，然后就可以了

   - （void）textFieldDidBeginEditing：（UITextField *）textField 
 {
 [self.view scrollToView：textField]; 
} 
 
  - （void）textFieldDidEndEditing：（UITextField *）textField 
 {
 [self.view scrollToY：0]; 
 [textField resignFirstResponder]; 
} 
  

......或者其他什么。该类别为您提供了三种调整视图位置的好方法。

I know this a frequent question but ive had no luck implementing this from examples i have found. i could be doing something simple wrong..(lets hope so). i am trying to move the UIview up as a have a textfield hidden at the bottom.

A little about my app, its got a tab bar controller and implements a standard UIView. When i add the code to move the display up nothing happens. Do i need to have a scroll view for this to work, is it a conflict with tab controller or am i doing something else wrong? thanks

Dan

解决方案

I wrote a little category on UIView that manages temporarily scrolling things around without needing to wrap the whole thing into a UIScrollView. My use of the verb "scroll" here is perhaps not ideal, because it might make you think there's a scroll view involved, and there's not--we're just animating the position of a UIView (or UIView subclass).

There are a bunch of magic numbers embedded in this that are appropriate to my form and layout that might not be appropriate to yours, so I encourage tweaking this to fit your specific needs.

UIView+FormScroll.h:

#import <Foundation/Foundation.h>

@interface UIView (FormScroll) 

-(void)scrollToY:(float)y;
-(void)scrollToView:(UIView *)view;
-(void)scrollElement:(UIView *)view toPoint:(float)y;

@end

UIView+FormScroll.m:

#import "UIView+FormScroll.h"


@implementation UIView (FormScroll)


-(void)scrollToY:(float)y
{

    [UIView beginAnimations:@"registerScroll" context:NULL];
    [UIView setAnimationCurve:UIViewAnimationCurveEaseInOut];
    [UIView setAnimationDuration:0.4];
    self.transform = CGAffineTransformMakeTranslation(0, y);
    [UIView commitAnimations];

}

-(void)scrollToView:(UIView *)view
{
    CGRect theFrame = view.frame;
    float y = theFrame.origin.y - 15;
    y -= (y/1.7);
    [self scrollToY:-y];
}


-(void)scrollElement:(UIView *)view toPoint:(float)y
{
    CGRect theFrame = view.frame;
    float orig_y = theFrame.origin.y;
    float diff = y - orig_y;
    if (diff < 0) {
        [self scrollToY:diff];
    }
    else {
        [self scrollToY:0];
    }

}

@end

Import that into your UIViewController, and then you can do

- (void)textFieldDidBeginEditing:(UITextField *)textField
{
    [self.view scrollToView:textField];
}

-(void) textFieldDidEndEditing:(UITextField *)textField
{
    [self.view scrollToY:0];
    [textField resignFirstResponder];
}

...or whatever. That category gives you three pretty good ways to adjust the position of a view.

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