二、工程图
三、代码
viewcontroller.h
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#import <uikit/uikit.h>@interface viewcontroller : uiviewcontroller<uitextfielddelegate>@end |
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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