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
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）
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//
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
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下面是监听通知：
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#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
doubleduration
= [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;
}
}];
}
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.h文件中声明
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@interfaceUIView
(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
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@implementationUIView
(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
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