关闭键盘

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#pragma mark -- 实现UITextFieldDelegate委托协议方法
-(BOOL)textFieldShouldReturn:(UITextField *)textField{
    NSLog(@"TextField获得焦点，点击return键");
    //点击return关闭键盘
    [textField resignFirstResponder];
    return YES;
}

#pragma mark -- 实现UITextViewDelegate委托协议方法
-(BOOL)textView:(UITextView *)textView shouldChangeTextInRange:(NSRange)range replacementText:(NSString *)text{
    if ([text isEqualToString:@"\n"]) {
        NSLog(@"TextView获得焦点，点击return键");
        //点击return关闭键盘
        [textView resignFirstResponder];
        return NO;
    }
    return YES;
}