实现textFiel和textView中的键盘的关闭

实现委托UITextFieldDelegate, UITextViewDelegate里以下方法

#pragma mark 放弃“第一响应者”
-(BOOL)textFieldShouldReturn:(UITextField *)textField{
    [textField resignFirstResponder];
    return YES;
}

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