iOS开发之监听键盘高度的变化分类： ios技术 2015-04-21 12:04 233人阅读评论(0) 收藏

2023-08-02 21:15:52

最近做的项目中，有一个类似微博中的评论转发功能，屏幕底端有一个输入框用textView来做，当textView成为第一响应者的时候它的Y值随着键盘高度的改变而改变，保证textView紧贴着键盘，但又不会被键盘挡住。

下面是我实现的方法：（利用通知）

//

 键盘通知

//

 键盘的frame发生改变时发出的通知（位置和尺寸）

//   

 UIKeyboardWillChangeFrameNotification

//   

 UIKeyboardDidChangeFrameNotification

//

 键盘显示时发出的通知

//   

 UIKeyboardWillShowNotification

//   

 UIKeyboardDidShowNotification

//

 键盘隐藏时发出的通知

//   

 UIKeyboardWillHideNotification

//   

 UIKeyboardDidHideNotification

[[NSNotificationCenter

 defaultCenter] addObserver:self selector:

@selector

(keyboardWillChangeFrame:)

 name:UIKeyboardWillChangeFrameNotification object:nil];

//在这里注册通知

下面是监听通知：

#pragma

 mark - 监听方法

/**

*

 键盘的frame发生改变时调用（显示、隐藏等）

*/

-

 (

void

)keyboardWillChangeFrame:(NSNotification

 *)notification

{

//   

 if (self.picking) return;

/**

notification.userInfo

 = @{

//

 键盘弹出\隐藏后的frame

UIKeyboardFrameEndUserInfoKey

 = NSRect: {{0, 352}, {320, 216}},

//

 键盘弹出\隐藏所耗费的时间

UIKeyboardAnimationDurationUserInfoKey

 = 0.25,

//

 键盘弹出\隐藏动画的执行节奏（先快后慢，匀速）

UIKeyboardAnimationCurveUserInfoKey

 = 7

}

*/

NSDictionary

 *userInfo = notification.userInfo;

//

 动画的持续时间

double

duration

 = [userInfo[UIKeyboardAnimationDurationUserInfoKey] doubleValue];

//

 键盘的frame

CGRect

 keyboardF = [userInfo[UIKeyboardFrameEndUserInfoKey] CGRectValue];

//

 执行动画

[UIView

 animateWithDuration:duration animations:^{

//

 工具条的Y值 == 键盘的Y值 - 工具条的高度

if

(keyboardF.origin.y

 > self.view.height) {

//

 键盘的Y值已经远远超过了控制器view的高度

self.toolbar.y

 = self.view.height - self.toolbar.height;

//这里的<span

 style="background-color: rgb(240, 240, 240);">self.toolbar就是我的输入框。</span>

}else{

self.toolbar.y

 = keyboardF.origin.y - self.toolbar.height;

}

}];

}

当然，这里我为UIView写了一个类别，实现如下：

.h文件中声明

@interface

UIView

 (Extension)

@property

(nonatomic,

 assign) CGFloat x;

@property

(nonatomic,

 assign) CGFloat y;

@property

(nonatomic,

 assign) CGFloat width;

@property

(nonatomic,

 assign) CGFloat height;

@property

(nonatomic,

 assign) CGFloat centerX;

@property

(nonatomic,

 assign) CGFloat centerY;

@property

(nonatomic,

 assign) CGSize size;

@property

(nonatomic,

 assign) CGPoint origin;

@end

.m文件中实现（重写setter 和 getter）

@implementation

UIView

 (Extension)

-

 (

void)setX:(CGFloat)x

{

CGRect

 frame = self.frame;

frame.origin.x

 = x;

self.frame

 = frame;

}

-

 (

void)setY:(CGFloat)y

{

CGRect

 frame = self.frame;

frame.origin.y

 = y;

self.frame

 = frame;

}

-

 (CGFloat)x

{

returnself.frame.origin.x;

}

-

 (CGFloat)y

{

returnself.frame.origin.y;

}

-

 (

void)setCenterX:(CGFloat)centerX

{

CGPoint

 center = self.center;

center.x

 = centerX;

self.center

 = center;

}

-

 (CGFloat)centerX

{

returnself.center.x;

}

-

 (

void)setCenterY:(CGFloat)centerY

{

CGPoint

 center = self.center;

center.y

 = centerY;

self.center

 = center;

}

-

 (CGFloat)centerY

{

returnself.center.y;

}

-

 (

void)setWidth:(CGFloat)width

{

CGRect

 frame = self.frame;

frame.size.width

 = width;

self.frame

 = frame;

}

-

 (

void)setHeight:(CGFloat)height

{

CGRect

 frame = self.frame;

frame.size.height

 = height;

self.frame

 = frame;

}

-

 (CGFloat)height

{

returnself.frame.size.height;

}

-

 (CGFloat)width

{

returnself.frame.size.width;

}

-

 (

void)setSize:(CGSize)size

{

CGRect

 frame = self.frame;

frame.size

 = size;

self.frame

 = frame;

}

-

 (CGSize)size

{

returnself.frame.size;

}

-

 (

void)setOrigin:(CGPoint)origin

{

CGRect

 frame = self.frame;

frame.origin

 = origin;

self.frame

 = frame;

}

-

 (CGPoint)origin

{

returnself.frame.origin;

}

@end

有需要的朋友可以直接用

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