IOS点击return隐藏键盘

ios 提供的键盘并不能自己隐藏，因此需要我们去实现

UITextField

.h文件实现UITextFileldDelegate

.m文件中

-（void）viewDidLoad
{
  textfield.delegate = self;
}

-(BOOL)textFieldShouldReturn:(UITextField *)textField{[textfield resignFirstResponder];return YES;}

UITextView:

.h文件实现UITextViewDelegate

.m文件中

-（void）viewDidLoad
{
  textView.delegate = self;
}

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