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:『https://github.com/boai/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:
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#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;
}
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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:
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- 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;
}
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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,
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/*! 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;
}];
}
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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:
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self.replyTextField.inputAccessoryView = self.replyTextField2;
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需要添加target 事件:
[self.replyTextField addTarget:self action:@selector(replyTextFieldChanged:) forControlEvents:UIControlEventEditingChanged];
事件方法处理:
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- ( 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;
}
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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!
以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持服务器之家。
原文链接:http://www.jianshu.com/p/0939a30f5951