UITextView 关闭键盘

最新推荐文章于 2013-06-27 14:29:35 发布

原创最新推荐文章于 2013-06-27 14:29:35 发布 · 418 阅读

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本文介绍如何使用Swift控制iOS应用中的键盘行为，包括键盘显示、隐藏及响应事件等关键操作。文章详细展示了如何通过代码实现对键盘显示时机的精确控制，并提供了一个简单的例子来演示如何在用户按下回车键时关闭键盘。

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//开始触发键盘
-(BOOL)textViewShouldBeginEditing:(UITextView *)textView
{
    return YES;
}

//在触发键盘之前可以触发一些必要的事件。
-(void)textViewDidBeginEditing:(UITextView *)textView
{
    NSLog(@"Begin");
/*
    UIBarButtonItem *done =    [[[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemDone target:self action:@selector(leaveEditMode)] autorelease];  
    self.navigationItem.rightBarButtonItem = done; 
*/    
}


//下面这段搞定键盘关闭。点return 果断关闭键盘
-(BOOL)textView:(UITextView *)textView shouldChangeTextInRange:(NSRange)range replacementText:(NSString *)text  
{  
    if ([text isEqualToString:@"\n"]) {  
        [textView resignFirstResponder];  
        return NO;  
    }  
    return YES;  
}  


//下面这段来自网络
UIToolbar * topView = [[UIToolbar alloc]initWithFrame:CGRectMake(0, 0, 320, 30)];  
    [topView setBarStyle:UIBarStyleBlack];  
      
    UIBarButtonItem * helloButton = [[UIBarButtonItem alloc]initWithTitle:@"Hello" style:UIBarButtonItemStyleBordered target:self action:nil];  
      
    UIBarButtonItem * btnSpace = [[UIBarButtonItem alloc]initWithBarButtonSystemItem:UIBarButtonSystemItemFlexibleSpace target:self action:nil];  
      
    UIBarButtonItem * doneButton = [[UIBarButtonItem alloc]initWithTitle:@"Done" style:UIBarButtonItemStyleDone target:self action:@selector(dismissKeyBoard)];  
      
      
    NSArray * buttonsArray = [NSArray arrayWithObjects:helloButton,btnSpace,doneButton,nil];  
    [doneButton release];  
    [btnSpace release];  
    [helloButton release];  
      
    [topView setItems:buttonsArray];  
    [tvTextView setInputAccessoryView:topView];  
  
-(IBAction)dismissKeyBoard  
{  
    [tvTextView resignFirstResponder];  
}