iOS 关于退出键盘两种方法和避免遮挡

退出键盘：

　　方法1：不使用代理，直接使用；

-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event

{

[self.textField resignFirstResponder];

}

方法2：使用代理，通过点击键盘Return键收起键盘

- (BOOL)textFieldShouldReturn:(UITextField *)textField{

//textField放弃第一响应者 （收起键盘）

[textField resignFirstResponder];

return YES;

}

两种方法可以同时添加，还有几种方法：

这三种方法在调用时，也都可以退出键盘。

[self.view endEditing:YES];

[[[UIApplication sharedApplication] keyWindow] endEditing:YES];

[[UIApplication sharedApplication] sendAction:@selector(resignFirstResponder) to:nil from:nil forEvent:nil];

避免键盘弹出遮挡输入框：

方法1：自己代码集成。

在viewDidLoad中注册两个通知，监听键盘弹出和退出

 //增加监听，当键盘出现或改变时收出消息 //增加监听，当键退出时收出消息
 [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillShow:) name:UIKeyboardWillShowNotification object:nil]; 

//增加监听，当键退出时收出消息

  [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillHide:) name:UIKeyboardWillHideNotification object:nil];

- (void)keyboardWillShow:(NSNotification*)aNotification {

NSDictionary *info = [aNotification userInfo];

CGSize keyboardSize = [[info objectForKey:UIKeyboardFrameEndUserInfoKey] CGRectValue].size;

//目标视图UITextField

CGRect frame = self.textField.frame;

int offsetY = frame.origin.y + frame.size.height - (self.view.frame.size.height - keyboardSize.height);

NSTimeInterval animationDuration = 0.30f;

[UIView beginAnimations:@"ResizeView" context:nil];

[UIView setAnimationDuration:animationDuration];

if(offsetY > 0)

{

self.view.frame = CGRectMake(0, -offsetY, self.view.frame.size.width, self.view.frame.size.height);

}

[UIView commitAnimations];

}

//键盘隐藏后将视图恢复到原始状态

-(void)keyboardWillHide:(NSNotification *)aNotification

{

NSTimeInterval animationDuration = 0.30f;

[UIView beginAnimations:@"ResizeView" context:nil];

[UIView setAnimationDuration:animationDuration];

self.view.frame =CGRectMake(0, 0, self.view.frame.size.width, self.view.frame.size.height);

[UIView commitAnimations];

}

方法2：使用IQKeyboardManager：

github地址： https://github.com/hackiftekhar/IQKeyboardManager