iOS开发第三方键盘处理的那些事儿

96
博爱1616
2016.05.17 17:32* 字数 527

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最近项目中遇到了键盘处理通知被调用多次的情况,废了好半天时间才找到解决办法,今天就给小伙伴儿们唠唠第三方键盘处理的那些坑!
详情请看:『BAKeyboardDemo』

1、聊天评论框的封装

先聊聊我项目中遇到的奇葩情况吧,一个直播界面,上面播放器,下面是分段控制器5个button,5个界面,其中三个界面最下面都是评论框,所以就封装了一个评论框公用。
但是本来用的『IQKeyboardManager』,开源键盘处理框架,可是在同一个界面有多个评论框就出现问题了。

2、先看看『IQKeyboardManager』的使用吧:

#import "AppDelegate.h"

AppDelegate 中添加这段代码,就可以全局不用管键盘的弹起收回了!

#pragma mark -  键盘处理
- (void)completionHandleIQKeyboard
{
    IQKeyboardManager *manager = [IQKeyboardManager sharedManager];
    manager.enable = YES;
    manager.shouldResignOnTouchOutside = YES;
    manager.shouldToolbarUsesTextFieldTintColor = YES;
    manager.enableAutoToolbar = YES;
}

3、具体解决办法

但是我项目中得复杂情况就不行了,键盘弹起异常,收回也异常,尤其是用了聊天室这种view,处理的更麻烦,不要急,看看博爱这些年踩过的坑吧:
先看看键盘处理事件吧:

- 1、首先注册通知:
- (void)registNotification
{
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWasShown:) name:UIKeyboardWillShowNotification object:nil];
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWasHidden:) name:UIKeyboardWillHideNotification object:nil];
}


- 2、再把后路想好:移除通知
- (void)removeNotification
{
    [[NSNotificationCenter defaultCenter] removeObserver:self];
}

- 3、通知事件处理:
/*! 键盘显示要做什么 */
- (void)keyboardWasShown:(NSNotification *)notification
{
    NSDictionary *info                                  = [notification userInfo];

    double duration                                     = [info[UIKeyboardAnimationDurationUserInfoKey] doubleValue];

    CGFloat curkeyBoardHeight                           = [[info objectForKey:@"UIKeyboardBoundsUserInfoKey"] CGRectValue].size.height;
    CGRect begin                                        = [[info objectForKey:@"UIKeyboardFrameBeginUserInfoKey"] CGRectValue];
    CGRect end                                          = [[info objectForKey:@"UIKeyboardFrameEndUserInfoKey"] CGRectValue];

    CGFloat keyBoardHeight;

    /*! 第三方键盘回调三次问题,监听仅执行最后一次 */
    if(begin.size.height > 0 && (begin.origin.y - end.origin.y > 0))
    {
        keyBoardHeight                                  = curkeyBoardHeight;
        [UIView animateWithDuration:duration animations:^{

            CGRect viewFrame                            = [self getCurrentViewController].view.frame;
            viewFrame.origin.y -= keyBoardHeight;
            [self getCurrentViewController].view.frame = viewFrame;
        }];
    }
}

- (void)keyboardWasHidden:(NSNotification *)notification
{
    NSDictionary *info = [notification userInfo];
    double duration = [info[UIKeyboardAnimationDurationUserInfoKey] doubleValue];

    [UIView animateWithDuration:duration animations:^{

        CGRect viewFrame = [self getCurrentViewController].view.frame;
        viewFrame.origin.y = 0;
        [self getCurrentViewController].view.frame = viewFrame;
    }];
}

/*!
*  获取当前View的VC
*
*  @return 获取当前View的VC
*/
- (UIViewController *)getCurrentViewController
{
    for (UIView *view = self; view; view = view.superview)
    {
    UIResponder *nextResponder = [view nextResponder];
    if ([nextResponder isKindOfClass:[UIViewController class]])
    {
    return (UIViewController *)nextResponder;
    }
    }
    return nil;
}

具体情况是这样的,在测试过程中,其他界面的评论框都没问题,就直播这个VC有问题,就一步步往下找,后来发现:iOS的第三方键盘会在【- (void)keyboardWasShown:(NSNotification *)notification】这个方法中来回调用多次,不止三次好像,然后就想到一个办法,

/*! 第三方键盘回调三次问题,监听仅执行最后一次 */
if(begin.size.height > 0 && (begin.origin.y - end.origin.y > 0))
{
    keyBoardHeight                                  = curkeyBoardHeight;
    [UIView animateWithDuration:duration animations:^{

        CGRect viewFrame                            = [self getCurrentViewController].view.frame;
        viewFrame.origin.y -= keyBoardHeight;
        [self getCurrentViewController].view.frame = viewFrame;
    }];
}

在这里处理这个键盘弹起事件中第一次获取键盘的高度,然后就直接把上面的view给弹上去,这样就避免了第三方键盘会来回调用多次方法,造成键盘弹起异常的问题就迎刃而解了!

  • 4、如果这样还不能解决你的键盘问题,还有中万能方法:
 平时可能遇到这种需求:点击一个按钮,弹出评论框和键盘,这时你就需要这样处理了:
1、创建一个  TextField、TextField2,把TextField位置放到屏幕外面看不到的地方,TextField 有个属性,用法如下: self.replyTextField.inputAccessoryView = self.replyTextField2;

需要添加target 事件:        [self.replyTextField addTarget:self action:@selector(replyTextFieldChanged:) forControlEvents:UIControlEventEditingChanged];

事件方法处理:
- (void)replyTextFieldChanged:(UITextField *)textField
{
    NSLog(@"textFieldShouldBeginEditing输入内容****:%@", textField.text);
    if (textField != self.replyTextField2)
    {
        self.replyTextField2.text = textField.text;
    }
    
    NSLog(@"textFieldShouldBeginEditing输入内容1:%@", self.replyTextField.text);
    NSLog(@"textFieldShouldBeginEditing输入内容2:%@", self.replyTextField2.text);
}

-  (BOOL)textFieldShouldReturn:(UITextField *)textField
{
    [self.replyTextField resignFirstResponder];
    [self.replyTextField2 resignFirstResponder];

    [[self getCurrentViewController].view endEditing:YES];

    if (self.clickIndexBlock)
    {
        self.clickIndexBlock(self.replyTextField2.text);
        self.replyTextField.text = @"";
        self.replyTextField2.text = @"";
    }
    
    return YES;
}

这样处理,不管你的键盘在哪里,输入框都会跟着你的键盘走,而且不会再出现错位,计算不准确的地方!<br>
好了,有啥问题可以加我们的QQ群一起讨论:479663605 <br>

详情请看:『BAKeyboardDemo』
More info: 『BABaseProject』

iOS 开发
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