当我们在可输入信息的控件上结束输入时，可隐藏键盘以下两句代码：
1 [self.onetf resignFirstResponder]; 某一个可输入控件放弃第一响应者
2 [self.view endEditing:YES]; 当前页面上所有可输入控件停止编辑
用以下几个方法来隐藏键盘1 借助当前输入框的父View（或者父View的父View）
1）父view为继承自UIResponder的对象
可以直接调用touch方法来隐藏键盘
-(void)touchesEnded:(NSSet*)touches withEvent:(UIEvent *)event {
[self.onetf resignFirstResponder];
}
2）在父view上添加点击事件
UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(dismissKeyboard:)];
[self.fristView addGestureRecognizer:tap];
- (void)dismissKeyboard:(id)sender{
[self.onetf resignFirstResponder];
}
3)将父view所继承的类改为UIControl，使用UIControl 的 Touch Up Inside 事件来收起键盘
- (IBAction)dismissKeyboard:(id)sender {
[self.onetf resignFirstResponder];
}
2 点击键盘上的Return键 收起键盘
- (BOOL)textFieldShouldReturn:(UITextField *)textField {
[self.onetf resignFirstResponder];
return YES;
}
3 继承于UIScrollView的控件可以在滑动是收起键盘
1 ）首先遵守UIScrollViewDelegate协议，滚动结束后收起键盘
- (void)scrollViewDidScroll:(UIScrollView *)scrollView
{
[self.onetf resignFirstResponder];
}
2）设置ScrollView的属性keyboardDismissMode，滚动时收起键盘
self.tableView.keyboardDismissMode = UIScrollViewKeyboardDismissModeOnDrag;
4 统一收起键盘
[[[UIapplication sharedApplication] keyWindow] endEditing:YES];
5. 直接发送 resignFirstResponder 消息：
[[UIApplication sharedApplication] sendAction:@selector(resignFirstResponder) to:nil from:nil forEvent:nil];
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