iOS 的TextView的常规用法_ios的textview-优快云博客

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];
}

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

//动画时间
#define kAnimationDuration 0.2
//view高度
#define kViewHeight 56

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];
}