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 |
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; } }];} |
.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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