【移动应用开发技术】iOS如何实现键盘自适应弹出效果

【移动应用开发技术】iOS如何实现键盘自适应弹出效果

一、iOS键盘自适应弹出效果图/upload/information/20200623/126/121488.jpg二、工程图/upload/information/20200623/126/121489.jpg三、代码ViewController.h#import

<UIKit/UIKit.h>

@interface

ViewController

:

UIViewController

<UITextFieldDelegate>

@end#import

"ViewController.h"

@interface

ViewController

()

@end

@implementation

ViewController

-

(void)viewDidLoad

{

[super

viewDidLoad];

//

Do

any

additional

setup

after

loading

the

view,

typically

from

a

nib.

UITextField

*field=[[UITextField

alloc]initWithFrame:CGRectMake(100,

300,

50,

50)];

field.backgroundColor=[UIColor

redColor];

field.delegate=self;

[self.view

addSubview:field];

[[NSNotificationCenter

defaultCenter]

addObserver:self

selector:@selector(keyboardWillShow:)

name:UIKeyboardWillShowNotification

object:nil];

[[NSNotificationCenter

defaultCenter]

addObserver:self

selector:@selector(keyboardWillHide:)

name:UIKeyboardWillHideNotification

object:nil];

}

#pragma

-mark

-keyboard

notificatin

-

(void)keyboardWillShow:(NSNotification

*)notification

{

NSDictionary

*info

=

[notification

userInfo];

//

keyboardHeight

为键盘高度

CGSize

keyboardSize

=

[[info

objectForKey:UIKeyboardFrameEndUserInfoKey]

CGRectValue].size;

[self

animateViewWithKeyboardHeight:keyboardSize.height];

}

-

(void)keyboardWillHide:(NSNotification

*)notification

{

[self

animateViewWithKeyboardHeight:0.0];

}

-

(void)animateViewWithKeyboardHeight:(CGFloat)keyboardHeight

{

NSTimeInterval

animationDuration

=

0.3f;

CGFloat

height

=

self.view.bounds.size.height;

CGFloat

width

=

self.view.bounds.size.width;

CGFloat

topSize

=

0.0;

CGFloat

viewH

=

self.view.frame.size.height-64;

CGFloat

deviceHeight

=

[UIScreen

mainScreen].bounds.size.height;

CGFloat

animateH

=

deviceHeight

-

viewH

-

keyboardHeight;

if

(animateH

>=

0)

{

topSize

=

0;

CGRect

toRect

=

CGRectMake(0,

topSize,

width,

height);

self.view.frame

=

toRect;

}

else

{

topSize

=

animateH;

CGRect

toRect

=

CGRectMake(0,

topSize,

width,

height);

[UIView

animateWithDuration:animationDuration

animations:^{

self.view.frame

=

toRect;

}];

}

}

#pragma

-mark

-UITextFieldDelegate

-(BOOL)textFieldShouldReturn:(UITextField

*)textField

{

[textField

resignFirstResponder];

return

YES;

}

-

(void)di