键盘操作往往需要添加一个遮盖层，防止点击其他地方导致出错

1，部分声明

@property (nonatomic, strong) UIView *coverView;

@property (nonatomic, strong)UITapGestureRecognizer *sideslipTapGes;

2实现方法

- (void)showCoverView {

//_testview：弹出键盘后遮挡的view

_coverView=[[UIView alloc]init];

_coverView.frame=CGRectMake(0, 0, 320, 640);

_coverView.backgroundColor=[UIColor colorWithRed:1.f/255.f green:1.f/255.f blue:1.f/255.f alpha:0.4];

//单击覆盖层手势

_sideslipTapGes= [[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(handeTap)];

[_sideslipTapGes setNumberOfTapsRequired:1];

[_coverView addGestureRecognizer:_sideslipTapGes];

[self.view addSubview:_coverView];

_coverView.hidden=YES;

}

/**

*explain:点击遮盖层

*/

-(void)handeTap{

[self.view endEditing:YES];

}

#pragma mark- 监听键盘操作

- (void)viewDidAppear:(BOOL)animated{

[super viewDidAppear:animated];

[self registerForKeyboardNotifications];

}

- (void)viewWillDisappear:(BOOL)animated{

[super viewWillDisappear:animated];

[[NSNotificationCenter defaultCenter] removeObserver:self];

}

- (void)registerForKeyboardNotifications

{

[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWasShown:) name:UIKeyboardDidShowNotification object:nil];

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

[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillChangeFrame:) name:UIKeyboardWillChangeFrameNotification object:nil];

}

// Called when the UIKeyboardDidShowNotification is sent.

- (void)keyboardWasShown:(NSNotification*)aNotification

{

_coverView.hidden=NO;

}

-(void)keyboardWillChangeFrame:(NSNotification*)notification

{

}

// Called when the UIKeyboardWillHideNotification is sent

- (void)keyboardWillBeHidden:(NSNotification*)aNotification

{

_coverView.hidden=YES;

}

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

[textField resignFirstResponder];

return YES;

}