键盘状态监听

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#import "RootViewController.h"

@interface RootViewController ()<UITextFieldDelegate>

@end

@implementation RootViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    
    UIView *myView = [[UIView alloc]initWithFrame:CGRectMake(0, 0, 200, 200)];
    myView.backgroundColor = [UIColor blackColor];
    [self.view addSubview:myView];
    
    
    [self.view setBackgroundColor:[UIColor redColor]];
    
    [self createTextField];
}
-(void)createTextField{
//    初始化UITextField并设置frame
    UITextField *textField = [[UITextField alloc]initWithFrame:CGRectMake(100, 400, 100, 50)];
//    设置背景色
    textField.backgroundColor = [UIColor yellowColor];
    
    textField.delegate = self;
    
//    添加到视图
    [self.view addSubview:textField];
    
    
    //    键盘状态改变的时候，会发出以下通知
    //    UIKeyboardWillShowNotification; 键盘即将显示
    //    UIKeyboardDidShowNotification; 键盘显示完毕
    //    UIKeyboardWillHideNotification; 键盘即将消失
    //    UIKeyboardDidHideNotification;键盘消失完毕
    //    UIKeyboardWillChangeFrameNotification 键盘即将改变frame
    //    UIKeyboardDidChangeFrameNotification 键盘已经改变frame
    
//    获取通知中心
    NSNotificationCenter*center =  [NSNotificationCenter defaultCenter];
   
//  监听键盘弹出通知
    [center addObserver:self selector:@selector(KeyboardWillShow:) name:UIKeyboardWillShowNotification object:nil];
//    监听键盘收起通知
    [center addObserver:self selector:@selector(KeyboardWillHide:) name:UIKeyboardWillHideNotification object:nil];
    
//    成为第一响应者
//    [textField becomeFirstResponder];
}

//键盘将要消失时
-(void)KeyboardWillHide:(NSNotification*)noti{
    NSLog(@"%@",noti.userInfo);
//    UIKeyboardAnimationDurationUserInfoKey = "0.25";
//    UIKeyboardBoundsUserInfoKey = "NSRect: {{0, 0}, {375, 258}}";
//    UIKeyboardFrameBeginUserInfoKey = "NSRect: {{0, 409}, {375, 258}}";
//    UIKeyboardFrameEndUserInfoKey = "NSRect: {{0,667}, {375, 258}}";
    
    
    self.view.frame = CGRectMake(0, 0, self.view.frame.size.width, self.view.frame.size.height);
}
//键盘将要出现
-(void)KeyboardWillShow:(NSNotification*)noti{
    NSLog(@"%@",noti.userInfo);
//    UIKeyboardAnimationDurationUserInfoKey = "0.25";
//    UIKeyboardBoundsUserInfoKey = "NSRect: {{0, 0}, {375, 258}}";
//    UIKeyboardFrameBeginUserInfoKey = "NSRect: {{0, 667}, {375, 258}}";
//    UIKeyboardFrameEndUserInfoKey = "NSRect: {{0, 409}, {375, 258}}";
//    UIKeyboardIsLocalUserInfoKey = 1;
    
    CGRect rect =  [noti.userInfo[UIKeyboardFrameEndUserInfoKey]CGRectValue];
    NSLog(@"rect = %@",NSStringFromCGRect(rect));
    
    
    self.view.frame  = CGRectMake(0, -rect.size.height, self.view.frame.size.width, self.view.frame.size.height);
}

#pragma mark - textField delegate
-(BOOL)textFieldShouldReturn:(UITextField *)textField{
//    取消第一响应者
    [textField resignFirstResponder];
    return YES;
}
@end