UITextView收起键盘

1. 遵循代理<UITextViewDelegate>

2.设置代理self.textView.delegate = self;

3. 实现代理方法:

- (BOOL)textView:(UITextView*)textView shouldChangeTextInRange:(NSRange)range replacementText:(NSString*)text

{

    if([text isEqualToString:@"\n"]) {

        [textView resignFirstResponder];

        returnNO;

   }

    return YES;

}