iOS键盘自适应弹出效果

一、ios键盘自适应弹出效果图

二、工程图

三、代码

viewcontroller.h

#import <uikit/uikit.h>

@interface viewcontroller : uiviewcontroller
<uitextfielddelegate>


@end

viewcontroller.m

#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)didreceivememorywarning {
  [super didreceivememorywarning];
  // dispose of any resources that can be recreated.
}


@end

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