二、工程图
三、代码
viewcontroller.h
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#import <uikit/uikit.h>
@interface viewcontroller : uiviewcontroller
<uitextfielddelegate>
@end
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viewcontroller.m
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#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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以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持服务器之家。