UITextView:文本视图控件，父类是UIScrollView，用于输入或者显示一行或多行内容，当输入或展示的内容超过textView.fame.size.width时自动换行，当内容超过textView.fame.size.height时自动出现滚动条
UITextField：用来输入一行内容
一.UITextView
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常用设置
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隐藏键盘方法
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模仿微信输入界面
二.UIMotion
手机摇动时执行的方法("UIResponder"中的motionBegan:withEvent方法)
一.UITextView
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常用设置
UITextView *textView = [[UITextView alloc]initWithFrame:CGRectMake(20, 74, 200, 100)]; [self.view addSubview:textView]; // 背景色 textView.backgroundColor = [UIColor yellowColor]; // 本文颜色 textView.textColor = [UIColor greenColor]; // 字体 textView.font=[UIFont systemFontOfSize:24]; // 设置是否允许编辑,默认是YES textView.editable = YES; // 设置是否允许滚动，默认是YES textView.scrollEnabled = YES; textView.delegate = self; textView.text = @"this is textView";
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隐藏键盘方法
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如果应用程序需要换行符时，可以设置单击换行时隐藏键盘 (缺点: textView一般需要换行功能的存在)
//协议方法 //是否允许修改文本内容，默认是YES -(BOOL)textView:(UITextView *)textView shouldChangeTextInRange:(NSRange)range replacementText:(NSString *)text { // if([text isEqualToString:@"\n"]){ // [textView resignFirstResponder]; // return NO; // } return YES; } -
用于采用了导航控制器的视图
//开始编辑时执行此协议方法（在导航栏上添加一个按钮用于隐藏键盘） -(void)textViewDidBeginEditing:(UITextView *)textView { UIBarButtonItem *item=[[UIBarButtonItem alloc]initWithTitle:@"Done" style:UIBarButtonItemStyleDone target:self action:@selector(hideKey)]; self.navigationItem.rightBarButtonItem=item; } //编辑结束时执行此协议方法（将导航栏上用于隐藏键盘的按钮项去掉） -(void)textViewDidEndEditing:(UITextView *)textView { self.navigationItem.rightBarButtonItem=nil; } -(void)hideKey { UITextView *textView=(UITextView *)[self.view viewWithTag:200]; [textView resignFirstResponder]; } -
设定一个工具栏
UIToolbar *toolBar = [[UIToolbar alloc]initWithFrame:CGRectMake(0, 0, self.view.frame.size.width, 30)]; UIBarButtonItem *itemDone = [[UIBarButtonItem alloc]initWithBarButtonSystemItem:UIBarButtonSystemItemDone target:self action:@selector(hideKey)]; UIBarButtonItem *item1 = [[UIBarButtonItem alloc]initWithBarButtonSystemItem:UIBarButtonSystemItemFlexibleSpace target:nil action:nil]; NSArray *array = [[NSArray alloc]initWithObjects:item1,itemDone, nil]; toolBar.items = array; //将工具栏设为inputAccessoryView，自动在键盘上面显示，不需要将toolBar再次添加到self.view textView.inputAccessoryView = toolBar;
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模仿微信输入界面
实现方法使视图随着键盘的弹出上移, 随着键盘隐藏收回
当文本内容超过textView的height时，增加其height去消息通知中心订阅一条消息（当键盘将要显示时UIKeyboardWillShowNotification）执行相应的方法
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillShow:) name:UIKeyboardWillShowNotification object:nil];
去消息通知中心订阅一条消息（当键盘将要显示时UIKeyboardWillHideNotification）执行相应的方法
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillHide:) name:UIKeyboardWillHideNotification object:nil];-
当键盘将要显示时，将底部的view向上移到键盘的上面
-(void)keyboardWillShow:(NSNotification*)notification { NSLog(@"keyboardWillShow"); //通过消息中的信息可以获取键盘的frame对象 NSValue *keyboardObj = [[notification userInfo]objectForKey:UIKeyboardFrameEndUserInfoKey]; // 获取键盘的尺寸 CGRect keyrect; [keyboardObj getValue:&keyrect]; CGRect rect=_bottomView.frame; //将底部视图的y值设置总高度－键盘的高度－自己的高度 rect.origin.y=HEIGHT-rect.size.height- keyrect.size.height; _bottomView.frame=rect; }
当键盘将要隐藏时（将原来移到键盘上面的视图还原）
-(void)keyboardWillHide:(NSNotification *)notification { CGRect rect=_bottomView.frame; rect.origin.y=HEIGHT-rect.size.height; _bottomView.frame=rect; }当文本内容超过textView的height时，增加其height
-(void)textViewDidChange:(UITextView *)textView { //获取内容大小 CGSize textSize = textView.contentSize; //当输入内容尺寸大于textView的大小时，增加内容时 if(textSize.height>textView.frame.size.height){ //修改底部视图的大小和坐标 CGRect vrect=_bottomView.frame; //计算出差值 CGFloat difference=textSize.height-textView.frame.size.height; //底部视图的高度增加，y坐标减少相应的差值 vrect.size.height+=difference; vrect.origin.y-=difference; _bottomView.frame=vrect; // 重设textView的height textView.frame=CGRectMake(10, 10, WIDTH-70, textSize.height); } //当减少内容时，内容尺寸小于textView的大小时，需要调整textView和底部视图的大小，位置 if(textView.frame.size.height>textSize.height&&textSize.height>30){ CGFloat difference=textView.frame.size.height-textSize.height; CGRect vrect=_bottomView.frame; vrect.size.height-=difference; vrect.origin.y+=difference; _bottomView.frame=vrect; textView.frame=CGRectMake(10, 10, WIDTH-70, textSize.height); NSLog(@"len=%d",textView.text.length); if(textView.text.length==0){ textView.frame=CGRectMake(10, 10, WIDTH-70, 30); } } }
UIMotion
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手机摇动时执行的方法("UIResponder"的方法)
摇动设备时执行此方法播放声音, 窗口视图frame左右移动 - (void)motionBegan:(UIEventSubtype)motion withEvent:(UIEvent *)event { NSLog(@"motionBegan"); SystemSoundID soundID; AudioServicesCreateSystemSoundID((__bridge CFURLRef)[[NSBundle mainBundle] URLForResource:@"音效" withExtension:@"caf"], &soundID); AudioServicesPlaySystemSound(soundID); //增加震动效果 AudioServicesPlaySystemSound(kSystemSoundID_Vibrate); [UIView animateWithDuration:1 animations:^{ CGRect rect=self.view.frame; rect.origin.x+=20; self.view.frame=rect; } completion:^(BOOL finished) { [UIView animateWithDuration:1 animations:^{ CGRect rect=self.view.frame; rect.origin.x-=40; self.view.frame=rect; } completion:^(BOOL finished) { [UIView animateWithDuration:1 animations:^{ CGRect rect=self.view.frame; rect.origin.x+=20; self.view.frame=rect; } completion:^(BOOL finished) { }]; }]; }]; }
