textView的用法及技巧
转自:http://bbs.9ria.com/thread-244445-1-1.html
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];
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];
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:@""])
- {
- [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。
<ignore_js_op>
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];
- }
效果图: