iOS keyBoardDemo

#import "ViewController.h"

@interface ViewController ()
@property (nonatomic, retain) UIView *aView; /**< 键盘背地图 */
@property (nonatomic, retain) UITextField *textField; /**< 键盘 */
@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    
    self.view.backgroundColor = [UIColor orangeColor];
    
    [self initTextField];
}

#pragma mark 键盘演示
/**键盘演示 */
- (void)initTextField
{
    self.aView = [[UIView alloc] initWithFrame:CGRectMake(0, self.view.frame.size.height - 40, self.view.frame.size.width, 40)];
    self.aView.backgroundColor = [UIColor lightGrayColor];
    [self.view addSubview:self.aView];

    self.textField = [[UITextField alloc] initWithFrame:CGRectMake((self.view.frame.size.width - 250) / 2,5,250,30)];
    self.textField.backgroundColor = [UIColor whiteColor];
    self.textField.placeholder = @"请输入";
    [self.aView addSubview:self.textField];
    
    
    //UIKeyboardWillShow
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyBoardwillAppear:) name:UIKeyboardWillShowNotification object:nil];
    //UIKeyboardWillHide
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(UIKeyboardWillHide:) name:UIKeyboardWillHideNotification object:nil];
}

/** UIKeyboardWillHide */
- (void)UIKeyboardWillHide:(NSNotification *)notifation
{
    [UIView animateWithDuration:0.25 animations:^{
        self.aView.frame = CGRectMake(0, self.view.frame.size.height - 40, self.view.frame.size.width, 40);
    }];
}


/** keyBoardwillAppear */
- (void)keyBoardwillAppear:(NSNotification *)notifation
{
    NSLog(@"%@",notifation);
    CGRect KeyboardFrame = [[notifation.userInfo objectForKey:@"UIKeyboardFrameEndUserInfoKey"] CGRectValue];
    NSLog(@"%@",NSStringFromCGRect(KeyboardFrame));
    
    //UIView动画
    [UIView animateWithDuration:0.25 animations:^{
        self.aView.frame = CGRectMake(0 , self.view.frame.size.height - KeyboardFrame.size.height -50, self.view.frame.size.width, 50);
    }];
}

/** 触摸开始的时候回收键盘 */
- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event
{
    [self.textField resignFirstResponder];
}



- (void)dealloc
{
    [[NSNotificationCenter defaultCenter] removeObserver:self forKeyPath:UIKeyboardWillShowNotification];
    [[NSNotificationCenter defaultCenter] removeObserver:self forKeyPath:UIKeyboardWillHideNotification];
    

}