黑色视图在隐藏键盘时进来

Question

以下是我在用户开始输入textview时为移动textview编写的一段代码。

这是代码，

-(BOOL)textViewShouldBeginEditing:(UITextView *)textView{
    if(textView == _textViewMsg || textView == _subjectView ){
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardDidShow:) name:UIKeyboardDidShowNotification object:nil];
   // return YES;
    }
    return YES;
}

- (BOOL)textViewShouldEndEditing:(UITextView *)textView{
    if(textView == _textViewMsg || textView == _subjectView ){
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardDidHide:) name:UIKeyboardDidHideNotification object:nil];

    [self.view endEditing:YES];
    }
    return YES;
}


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

    [self.view setFrame:CGRectMake(0,-50,320,460)];
}

-(void)keyboardDidHide:(NSNotification *)notification
{
    [self.view setFrame:CGRectMake(0,60,320,520)];
}

当我在移动中单击textview（在主题中）视图时，我可以输入textview。它工作正常。 （图1）

当我点击完成按钮时，隐藏，即在键盘隐藏时，一个黑色视图即将到来（检查图像2）几秒钟，然后再次正常显示。

编辑：

解决方案：@michael刚刚给我解决方案

将UIKeyboardDidHideNotification更改为UIKeyboardWillHideNotification它对我有用。

发生新问题： 当我开始输入前2个文本视图，即Requester，firstname＆amp; lastname ...我无法输入它，因为它正在向上移动。

Answer 1

添加观察者应该在viewdidload中。尝试将添加键盘观察者的代码移动到viewdidload。

修改

而不是...通知类型检查将... 所以用UIKeyboardWillHide替换UIKeyboardDidShowNotification和用UIKeyboardWillHide替换UIKeyboardDidHideNotification。

Answer 2

之所以发生这种情况，是因为在键盘确实消失后，系统动画完成后更改了视图的帧。快速修复：将UIKeyboardDidHideNotification更改为UIKeyboardWillHideNotification

但是我想在你的代码中指出其他一些项目，如果你不介意的话。

<强> 1 您每次开始编辑时都订阅通知。这意味着当用户第二次开始输入时，您的代码将被触发两次。订阅viewDidAppear上的通知并取消订阅viewWillDisappear更为合适：

- (void)viewDidAppear:(BOOL)animated {
    [super viewDidAppear: animated];
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardDidShow:) name:UIKeyboardDidShowNotification object:nil];
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillHide:) name:UIKeyboardDidHideNotification object:nil];
}

- (void)viewWillDisappear:(BOOL)animated {
    [super viewWillDisappear:animated];
    [[NSNotificationCenter defaultCenter] removeObserver:self];
}

<强> 2 然后将帧更改为常量值。但现在苹果支持不同尺寸的不同键盘，更不用说键盘尺寸因不同设备和不同可能模式而异。因此，从通知中获取键盘的大小要明智得多：

- (void)keyboardDidShow:(NSNotification *)aNotification
{
    CGRect keyboardFrame = [[aNotification.userInfo valueForKey: UIKeyboardFrameEndUserInfoKey] CGRectValue];
    CGRect overlap =  CGRectIntersection( self.view.frame, keyboardFrame);
    // Setup new frmae according to overlap, for example reduce size by half of overlap, and move up by another half
    CGRect newFrame = self.view.frame;
    newFrame.origin.y -= overlap.size.height / 2.0
    newFrame.size.height -= overlap.size.height / 2.0
    self.view.frame = newFrame;
}

第3： 动画：您也可以从通知中获取键盘动画持续时间： UIKeyboardAnimationDurationUserInfoKey：

NSTimeInterval duration = [[aNotification.userInfo  valueForKey: UIKeyboardAnimationDurationUserInfoKey] doubleValue];
[UIView animateWithDuration:duration animations:^{
    self.view.frame = newFrame;
}];

<强> 4 由于您似乎使用滚动视图（UITableView和UICollectioView是滚动视图），您可以代替更改框架，更改内容插入（将空白空间添加到底部滚动视图）

[self.view setContentInset:UIEdgeInsetsMake(0, 0, overlap.size.height, 0)];

<强> 5 考虑使用AutoLayout。

Answer 3

使用IQKeyboardManager框架将有助于处理键盘隐藏和取消隐藏问题，

键盘处理的最有效方式：IQKeyboardManager

方法1： 您可以将Cocoa Pod文件用于IQKeyboardManager库。

1. 初始化pod文件。
2. pod'IQKeyboardManager'
3. 安装Pod文件。

方法2：

从github下载IQKeyboardManger SDK并拖放放入项目文件中。

Swift代码段：

导入IQKeyboardManagerSwift

@UIApplicationMain class AppDelegate：UIResponder，UIApplicationDelegate {

var window: UIWindow?

func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {

  IQKeyboardManager.sharedManager().enable = true

  return true
}

}

Objective-C片段：

#import <IQKeyboardManager/IQKeyboardManager.h>

@implementation AppDelegate

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    //ONE LINE OF CODE.
    //Enabling keyboard manager(Use this line to enable managing distance between keyboard & textField/textView).
    [[IQKeyboardManager sharedManager] setEnable:YES];
return true;
}

希望这可以帮助您解决键盘隐藏和取消隐藏UI问题。