使用iOS SDK：
我有一个带UITextFields的UIView，可以启动键盘。我需要它能够：
启动键盘后，允许滚动UIScrollView的内容以查看其他文本字段自动“跳转”（通过向上滚动）或缩短
我知道我需要一个UIScrollView。我已经尝试将UIView的类更改为UIScrollView，但仍然无法上下滚动文本框。
我需要UIView和UIScrollView吗？一个在另一个里面吗？
要自动滚动到活动文本字段，需要执行哪些操作？
理想情况下，尽可能多的组件设置将在Interface Builder中完成。我只想编写需要的代码。
注意：我使用的UIView（或UIScrollView）是由一个选项卡（UITabBar）启动的，它需要正常工作。
我正在添加滚动条，只为键盘出现时使用。尽管不需要它，但我觉得它提供了一个更好的界面，例如，用户可以滚动和更改文本框。
当键盘上下移动时，我可以改变UIScrollView的框架大小。我只是在使用：
-(void)textFieldDidBeginEditing:(UITextField *)textField {
//Keyboard becomes visible
scrollView.frame = CGRectMake(scrollView.frame.origin.x,
scrollView.frame.origin.y,
scrollView.frame.size.width,
scrollView.frame.size.height - 215 + 50); // Resize
}
-(void)textFieldDidEndEditing:(UITextField *)textField {
// Keyboard will hide
scrollView.frame = CGRectMake(scrollView.frame.origin.x,
scrollView.frame.origin.y,
scrollView.frame.size.width,
scrollView.frame.size.height + 215 - 50); // Resize
}
然而，这不会自动“向上移动”或将可见区域中的下部文本字段居中，这是我真正想要的。
它很简单：-
在TextFieldDidBegginEditing中：-
self.view.frame=CGRectMake(self.view.frame.origin.x, self.view.frame.origin.y-150, self.view.frame.size.width, self.view.frame.size.height);
在TextFieldShouldEndEditing中：-
self.view.frame=CGRectMake(self.view.frame.origin.x, self.view.frame.origin.y+150, self.view.frame.size.width, self.view.frame.size.height);
我在这里没有看到这种可能性，所以我添加了它，因为我尝试了答案中的方法，但几个小时后发现在iOS6/7中的XCode 5中有一种更简单的方法：使用NSLayoutConstraints。
请参见：自动布局约束-键盘
这是我的代码：
.m文件：
// Called when the UIKeyboardWillShowNotification is sent.
- (void)keyboardWillBeShown:(NSNotification*)aNotification
{
NSLog(@"keyboardWillBeShown:");
[self.PhoneNumberLabelOutlet setHidden:TRUE];
CGFloat heightOfLabel = self.PhoneNumberLabelOutlet.frame.size.height;
for( NSLayoutConstraint* thisConstraint in self.topElementsVerticalDistanceFromTopLayoutConstraint ) {
thisConstraint.constant -= heightOfLabel;
}
NSDictionary* info = [aNotification userInfo];
CGSize kbSize = [[info objectForKey:UIKeyboardFrameBeginUserInfoKey] CGRectValue].size;
CGFloat oldConstant = [self.SignInYConstraint constant];
self.SignInYConstraint.constant = oldConstant + kbSize.height;
[self.view setNeedsUpdateConstraints];
NSTimeInterval duration = [[info objectForKey:UIKeyboardAnimationDurationUserInfoKey] doubleValue];
[UIView animateWithDuration:duration animations:^{
[self.view layoutIfNeeded];
}];
}
.h文件：
#import <UIKit/UIKit.h>
@interface SignInViewController : UIViewController {
UITextField* _activeField;
}
- (void)signInCallback:(NSObject*)object;
@property (weak, nonatomic) IBOutlet UILabel *PhoneNumberLabelOutlet;
@property (weak, nonatomic) IBOutlet UIActivityIndicatorView *ActivityIndicatorOutlet;
@property (weak, nonatomic) IBOutlet UITextField *UserIDTextfieldOutlet;
@property (weak, nonatomic) IBOutlet UITextField *PasswordTextfieldOutlet;
@property (weak, nonatomic) IBOutlet UIButton *SignInButton;
@property (weak, nonatomic) IBOutlet NSLayoutConstraint *SignInYConstraint;
@property (strong, nonatomic) IBOutletCollection(NSLayoutConstraint) NSArray *topElementsVerticalDistanceFromTopLayoutConstraint;
@end
我发现@DK_是我开始使用的解决方案。然而，假设scrollView覆盖了整个视图。我不是这样的。我只想要一个滚动视图，以防键盘覆盖了登录屏幕上的下文本字段。因此，我的内容视图与滚动视图大小相同，比主视图小。
它也没有考虑到景观，这是我开始遇到麻烦的地方。玩了几天后，这是我的键盘显示：方法。
- (void)keyboardWasShown:(NSNotification*)aNotification
{
// A lot of the inspiration for this code came from http://stackoverflow.com/a/4837510/594602
CGFloat height = 0;
NSDictionary* info = [aNotification userInfo];
CGRect kbFrameRect = [[info objectForKey:UIKeyboardFrameEndUserInfoKey] CGRectValue];
CGRect kbBoundsRect = [self.view convertRect:kbFrameRect fromView:nil]; // Convert frame from window to view coordinates.
CGRect scrollRect = scrollView.frame;
CGRect intersect = CGRectIntersection(kbBoundsRect, scrollRect);
if (!CGRectIsNull(intersect))
{
height = intersect.size.height;
UIEdgeInsets contentInsets = UIEdgeInsetsMake(0.0, 0.0, height, 0.0);
scrollView.contentInset = contentInsets;
scrollView.scrollIndicatorInsets = contentInsets;
}
// Figure out what the view rectangle is for the scrollView
CGPoint contentOffset = scrollView.contentOffset;
CGRect visibleRect = CGRectOffset(scrollRect, contentOffset.x, contentOffset.y); // I'm not 100% sure if this is needed/right. My scrollView was always at the top in testing.
visibleRect.size.height -= height;
CGRect activeRect = activeField.frame;
if (!CGRectContainsRect(visibleRect, activeRect))
{
[self.scrollView scrollRectToVisible:activeField.frame animated:YES];
}
}
我在使用自动布局时也遇到了一些困难。如果我没有正确完成布局，我就没有得到预期的滚动效果。有一件事让生活变得更加简单，那就是将所有要滚动的项目放在一个视图中，并将其作为滚动视图中的唯一项目。我把这个单一视图称为“内容视图”。
我认为关键部分是内容视图有一个设定的宽度和高度。这使得滚动视图能够准确地知道需要处理多少内容。这与通常的布局有点不同。通常情况下，视图会尽量占据更多空间。对于滚动视图的内容，您试图使视图尽可能地限制自己。内容视图允许您停止此操作。所以我给了我248的高度，并使用320的标准屏幕宽度作为我的宽度。
最终对我有用的布局如下：
滚动视图到超级视图：基本上我给了顶部、左侧和右侧的约束。水平空间-视图-滚动视图（0）垂直空间-视图-滚动视图（0）水平空间-滚动视图-视图（0）滚动视图高度：我将滚动视图设置为恒定高度。我不知道这是否真的有必要，但它有滚动视图本身的界限。高度-（248）-滚动视图滚动视图的内容视图：我给了所有方面的常量，顶部、左侧、底部和右侧。垂直空间-视图-滚动视图（0）垂直空间-滚动视图-视图（0）水平空间-视图-滚动视图（0）水平空间-滚动视图-视图（0）内容视图的维度。高度-（248）-视图宽度-（320）-视图
如果你还在为这件事而挣扎，请阅读我的帖子
我今天提出了一个解决方案。我读过很多关于这个问题的帖子和“教程”，没有一篇在任何情况下都有效（大多数都是相互复制粘贴的）。甚至苹果官方提出的“解决方案”也不起作用，更重要的是，它在横向模式下完全不起作用。苹果公司没有给开发者们解决这样一个常见的基本问题的方法，真是可耻。非常不专业。如此惊人的框架（Cocoa）和如此严重的被低估的问题。
现在，我的解决方案是：让UIScrollView成为您的根视图，然后将所有内容放入其中。然后从这个KeyboardAwareController类子类化视图控制器（您可能需要重新定义scrollView和keyboardPadding方法）：
////键盘AwareController.h//社会病////管理员于2014年1月13日创建。//版权所有（c）2014 kuchumovn。保留所有权利。//
#import <UIKit/UIKit.h>
@interface KeyboardAwareController : UIViewController <UITextFieldDelegate>
@end
////键盘AwareController.m//社会病////管理员于2014年1月13日创建。//版权所有（c）2014 kuchumovn。保留所有权利。//
#import "KeyboardAwareController.h"
@interface KeyboardAwareController ()
@end
@implementation KeyboardAwareController
{
CGPoint scrollPositionBeforeKeyboardAdjustments;
__weak UIScrollView* scrollView;
UITextField* activeField;
}
- (id) initWithCoder: (NSCoder*) decoder
{
if (self = [super initWithCoder:decoder])
{
scrollPositionBeforeKeyboardAdjustments = CGPointZero;
}
return self;
}
- (void) viewDidLoad
{
[super viewDidLoad];
}
- (UIScrollView*) scrollView
{
return (UIScrollView*) self.view;
}
- (CGFloat) keyboardPadding
{
return 5;
}
- (void) registerForKeyboardNotifications
{
[[NSNotificationCenter defaultCenter] addObserver:self
selector:@selector(keyboardWillShow:)
name:UIKeyboardWillShowNotification object:nil];
[[NSNotificationCenter defaultCenter] addObserver:self
selector:@selector(keyboardDidShow:)
name:UIKeyboardDidShowNotification object:nil];
[[NSNotificationCenter defaultCenter] addObserver:self
selector:@selector(keyboardWillBeHidden:)
name:UIKeyboardWillHideNotification object:nil];
}
- (void) deregisterFromKeyboardNotifications
{
[[NSNotificationCenter defaultCenter] removeObserver:self
name:UIKeyboardWillShowNotification
object:nil];
[[NSNotificationCenter defaultCenter] removeObserver:self
name:UIKeyboardDidShowNotification
object:nil];
[[NSNotificationCenter defaultCenter] removeObserver:self
name:UIKeyboardWillHideNotification
object:nil];
}
- (void) viewWillAppear: (BOOL) animated
{
[super viewWillAppear:animated];
[self registerForKeyboardNotifications];
}
- (void) viewWillDisappear: (BOOL) animated
{
[self deregisterFromKeyboardNotifications];
[super viewWillDisappear:animated];
}
- (void) keyboardWillShow: (NSNotification*) notification
{
//NSLog(@"keyboardWillShow");
// force the animation from keyboardWillBeHidden: to end
scrollView.contentOffset = scrollPositionBeforeKeyboardAdjustments;
scrollPositionBeforeKeyboardAdjustments = CGPointZero;
}
// warning: i have no idea why this thing works and what does every line of this code mean
// (but it works and there is no other solution on the internets whatsoever)
// P.S. Shame on Apple for missing such a basic functionality from SDK (and many other basic features we have to hack and mess around with for days and nights)
- (void) keyboardDidShow: (NSNotification*) notification
{
//NSLog(@"keyboardDidShow");
UIWindow* window = [[[UIApplication sharedApplication] windows]objectAtIndex:0];
UIView* mainSubviewOfWindow = window.rootViewController.view;
CGRect keyboardFrameIncorrect = [[[notification userInfo] objectForKey:UIKeyboardFrameEndUserInfoKey] CGRectValue];
CGRect keyboardFrame = [mainSubviewOfWindow convertRect:keyboardFrameIncorrect fromView:window];
CGSize keyboardSize = keyboardFrame.size;
CGRect visibleFrame = CGRectMake(0, 0, 0, 0);
visibleFrame.origin = self.scrollView.contentOffset;
visibleFrame.size = self.scrollView.bounds.size;
CGFloat paddedKeyboardHeight = keyboardSize.height + self.keyboardPadding;
//NSLog(@"visibleFrame %@", NSStringFromCGRect(visibleFrame));
visibleFrame.size.height -= paddedKeyboardHeight;
//NSLog(@"visibleFrame after keyboard height %@", NSStringFromCGRect(visibleFrame));
if (CGRectContainsPoint(visibleFrame, activeField.frame.origin))
return;
scrollPositionBeforeKeyboardAdjustments = scrollView.contentOffset;
UIEdgeInsets contentInsets = UIEdgeInsetsMake(0.0, 0.0, activeField.frame.origin.y - visibleFrame.size.height + activeField.frame.size.height, 0);
contentInsets = UIEdgeInsetsMake(0.0, 0.0, paddedKeyboardHeight, 0);
self.scrollView.contentInset = contentInsets;
self.scrollView.scrollIndicatorInsets = contentInsets;
CGSize scrollContentSize = self.scrollView.bounds.size;
scrollContentSize.height += paddedKeyboardHeight;
self.scrollView.contentSize = scrollContentSize;
//NSLog(@"scrollView %@", NSStringFromCGRect(scrollView.frame));
//NSLog(@"activeField %@", NSStringFromCGRect(activeField.frame));
//[scrollView scrollRectToVisible:activeField.frame animated:YES];
CGPoint scrollPoint = CGPointMake(0.0, activeField.frame.origin.y - visibleFrame.size.height + activeField.frame.size.height);
//NSLog(@"scrollPoint %@", NSStringFromCGPoint(scrollPoint));
[self.scrollView setContentOffset:scrollPoint animated:YES];
}
- (void) keyboardWillBeHidden: (NSNotification*) notification
{
//NSLog(@"keyboardWillBeHidden");
UIEdgeInsets contentInsets = UIEdgeInsetsZero;
// this doesn't work when changing orientation while the keyboard is visible
// because when keyboardDidShow: will be called right after this method the contentOffset will still be equal to the old value
//[scrollView setContentOffset:scrollPositionBeforeKeyboardAdjustments animated:YES];
[UIView animateWithDuration:.25 animations:^
{
self.scrollView.contentInset = contentInsets;
self.scrollView.scrollIndicatorInsets = contentInsets;
// replacement for setContentOffset:animated:
self.scrollView.contentOffset = scrollPositionBeforeKeyboardAdjustments;
}];
}
- (void) textFieldDidBeginEditing: (UITextField*) textField
{
activeField = textField;
}
- (void) textFieldDidEndEditing: (UITextField*) textField
{
activeField = nil;
}
@end
如果您有任何问题，我的项目将在github上托管：https://github.com/kuchumovn/sociopathy.ios
为了更好地解释，我还拍了一张截图：
