【移动应用开发技术】怎么在iOS中实现聊天输入框功能

【移动应用开发技术】怎么在iOS中实现聊天输入框功能

这篇文章将为大家详细讲解有关怎么在iOS中实现聊天输入框功能，文章内容质量较高，因此在下分享给大家做个参考，希望大家阅读完这篇文章后对相关知识有一定的了解。实现方法如下：-

(void)viewDidLoad

{

[super

viewDidLoad];

self.view.backgroundColor

=

[UIColor

colorWithRed:0.92

green:0.92

blue:0.92

alpha:1.00];

self.keyView

=

[[DKSKeyboardView

alloc]

initWithFrame:CGRectMake(0,

K_Height

-

51,

K_Width,

51)];

//设置代理方法

self.keyView.delegate

=

self;

[self.view

addSubview:_keyView];

}主要就是上面的添加，此时输入框就已经添加到当前的VC中；稍后会讲到里面的代理方法的作用；工程结构如下图

主要是红色线标出的两个类，结构比较简单设置输入行数，输入框内容变化时改变输入款高度DKSKeyboardView.h中的代码如下：#import

@protocol

DKSKeyboardDelegate

@optional

//非必实现的方法

/**

点击发送时输入框内的文案

@param

textStr

文案

*/

-

(void)textViewContentText:(NSString

*)textStr;

/**

键盘的frame改变

*/

-

(void)keyboardChangeFrameWithMinY:(CGFloat)minY;

@end

@interface

DKSKeyboardView

:

UIView

@property

(nonatomic,

weak)

id

delegate;

@end关于上面的两个代理方法，由于文章篇幅问题，实现的过程可参考demo，里面有详细的注释；在DKSKeyboardView.m中，以下列出少量重要代码，主要是改变frame1、点击输入框，键盘出现//键盘将要出现

-

(void)keyboardWillShow:(NSNotification

*)notification

{

[self

removeBottomViewFromSupview];

NSDictionary

*userInfo

=

notification.userInfo;

CGRect

endFrame

=

[userInfo[UIKeyboardFrameEndUserInfoKey]

CGRectValue];

//获取键盘的高度

self.keyboardHeight

=

endFrame.size.height;

//键盘的动画时长

CGFloat

duration

=

[userInfo[UIKeyboardAnimationDurationUserInfoKey]

doubleValue];

[UIView

animateWithDuration:duration

delay:0

options:[notification.userInfo[UIKeyboardAnimationCurveUserInfoKey]

integerValue]

animations:^{

self.frame

=

CGRectMake(0,

endFrame.origin.y

-

self.backView.height

-

StatusNav_Height,

K_Width,

self.height);

[self

changeTableViewFrame];

}

completion:nil];

}2、键盘消失-

(void)keyboardWillHide:(NSNotification

*)notification

{

//如果是弹出了底部视图时

if

(self.moreClick

||

self.emojiClick)

{

return;

}

[UIView

animateWithDuration:0.25

animations:^{

self.frame

=

CGRectMake(0,

K_Height

-

StatusNav_Height

-

self.backView.height,

K_Width,

self.backView.height);

[self

changeTableViewFrame];

}];

}3、点击更多按钮-

(void)moreBtn:(UIButton

*)btn

{

self.emojiClick

=

NO;

//主要是设置表情按钮为未点击状态

if

(self.moreClick

==

NO)

{

self.moreClick

=

YES;

//回收键盘

[self.textView

resignFirstResponder];

[self.emojiView

removeFromSuperview];

self.emojiView

=

nil;

[self

addSubview:self.moreView];

//改变更多、self的frame

[UIView

animateWithDuration:0.25

animations:^{

self.moreView.frame

=

CGRectMake(0,

self.backView.height,

K_Width,

bottomHeight);

self.frame

=

CGRectMake(0,

K_Height

-

StatusNav_Height

-

self.backView.height

-

bottomHeight,

K_Width,

self.backView.height

+

bottomHeight);

[self

changeTableViewFrame];

}];

}

else

{

//再次点击更多按钮

//键盘弹起

[self.textView

becomeFirstResponder];

}

}4、改变输入框大小-

(void)changeFrame:(CGFloat)height

{

CGRect

frame

=

self.textView.frame;

frame.size.height

=

height;

self.textView.frame

=

frame;

//改变输入框的frame

//当输入框大小改变时，改变backView的frame

self.backView.frame

=

CGRectMake(0,

0,

K_Width,

height

+

(viewMargin

*

2));

self.frame

=

CGRectMake(0,

K_Height

-

self.backView.height

-

self.keyboardHeight,

K_Width,

self.backView.height);

//改变更多按钮、表情按钮的位置

self.emojiBtn.frame

=

CGRectMake(viewMargin,

self.backView.height

-

viewHeight

-

viewMargin,

viewHeight,

viewHeight);

self.moreBtn.frame

=

CGRectMake(self.textView.maxX

+

viewMargin,

self.backView.height

-

viewHeight

-

viewMargin,

viewHeight,

viewHeight);

//主要是为了改变VC的view的frame

if

(self.delegate

&&

[self.delegate

responds