iOS 的TextView的常规用法

一、新建一个textView

//初始化 
UITextView *textView = [[[UITextView alloc] init] autorelease]; 

//设置代理 需在interface中声明
UITextViewDelegate textView.delegate = self; 

//字体大小 
textView.font = [UIFont systemFontOfSize:16]; 

//添加滚动区域 
textView.contentInset = UIEdgeInsetsMake(-11, -6, 0, 0); 

//是否可以滚动 
textView.scrollEnabled = NO; 

//获得焦点 
[textView becomeFirstResponder];
[self.view addSubview:textView];

 

二、键盘操作

//返回键的类型 
textView.returnKeyType = UIReturnKeyDefault; 
//键盘类型
 textView.keyboardType = UIKeyboardTypeDefault;

 

三、隐藏键盘的几种方式

个人还是认为最方便的是在键盘上加上一个ToolBar，在上面加上一个按钮来隐藏键盘

①在键盘上加上隐藏按钮

//定义一个toolBar
    UIToolbar * topView = [[UIToolbar alloc]initWithFrame:CGRectMake(0, 0, 320, 30)];
    //设置style
    [topView setBarStyle:UIBarStyleBlack];
    //定义两个flexibleSpace的button，放在toolBar上，这样完成按钮就会在最右边
    UIBarButtonItem * button1 =[[UIBarButtonItem alloc]initWithBarButtonSystemItem: UIBarButtonSystemItemFlexibleSpace target:self action:nil];
    UIBarButtonItem * button2 = [[UIBarButtonItem alloc]initWithBarButtonSystemItem: UIBarButtonSystemItemFlexibleSpace target:self action:nil];
    //定义完成按钮
    UIBarButtonItem * doneButton = [[UIBarButtonItem alloc]initWithTitle:@"完成" style:UIBarButtonItemStyleDone target:self action:@selector(resignKeyboard)];
    //在toolBar上加上这些按钮
    NSArray * buttonsArray = [NSArray arrayWithObjects:button1,button2,doneButton,nil];
    [topView setItems:buttonsArray];
    [textView setInputAccessoryView:topView];
    //隐藏键盘
    - (void)resignKeyboard {
        [textView resignFirstResponder];
    }
    // Do any additional setup after loading the view, typically from a nib.

 

最终效果

还有几种也可隐藏键盘的方式

②用回车键，前提是你的textView中不需要用到回车键

   -(BOOL)textView:(UITextView *)textView shouldChangeTextInRange:(NSRange)range replacementText:(NSString *)text { if ([text isEqualToString:@"\n"]) { [textView resignFirstResponder]; return NO; } return YES; }

 

③触摸空白处隐藏键盘

-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event { //隐藏键盘 [textView resignFirstResponder]; }

 

四、使键盘不挡住输入框

    在view中添加一个子view，设置此子view的tag值为1000，在此view上添加一个textView和一个发送按钮，如下图；我们要达到textView的键盘弹出时，整个View往上平移，键盘消失，view往下平移的效果，模拟发送短信的界面。

设置textView圆角

//设置textView圆角 
[self.textView.layer setCornerRadius:10];

 

①、在viewWillAppear中添加键盘监听事件

 //添加键盘的监听事件
    //注册通知,监听键盘弹出事件
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardDidShow:) name:UIKeyboardDidShowNotification object:nil];
    //注册通知,监听键盘消失事件
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardDidHidden) name:UIKeyboardDidHideNotification object:nil];

 

②、完成①selector中键盘弹出keyboardDidShow:和消失keyboardDidHidden方法

    在.m文件#import后面添加

键盘出现

 // 键盘弹出时
    -(void)keyboardDidShow:(NSNotification *)notification {
        //获取键盘高度
        NSValue *keyboardObject = [[notification userInfo] objectForKey:UIKeyboardFrameEndUserInfoKey]; CGRect keyboardRect; [keyboardObject getValue:&keyboardRect];
        //调整放置有textView的view的位置
        //设置动画
        [UIView beginAnimations:nil context:nil];
        //定义动画时间
        [UIView setAnimationDuration:kAnimationDuration];
        //设置view的frame，往上平移
        [(UIView *)[self.view viewWithTag:1000] setFrame:CGRectMake(0, self.view.frame.size.height-keyboardRect.size.height-kViewHeight, 320, kViewHeight)];
        [UIView commitAnimations];
    }

 

键盘消失

//键盘消失时
 -(void)keyboardDidHidden {
 //定义动画
 [UIView beginAnimations:nil context:nil];
 [UIView setAnimationDuration:kAnimationDuration];
 //设置view的frame，往下平移
 [(UIView *)[self.view viewWithTag:1000] setFrame:CGRectMake(0, self.view.frame.size.height-kViewHeight, 320, kViewHeight)];
 [UIView commitAnimations];
 }